It is defined by the associated wave vectors {\displaystyle \mathbf {k} } of this lattice, according to {\displaystyle {\mathbf {p} }_ {\text {crystal}}\equiv \hbar {\mathbf {k} }} 1. Google Classroom Facebook Twitter. Where the 4{momentum is writ-ten p T = (p 1 + p 2), the dot product of p T with itself, p T p T is equal to 2M T c2. Momentum and Impulse. 1 decade ago. Download PDF's . 244 views gives the state's periodicity, which is not the same as that of the lattice.This modulation contributes to the kinetic energy of the particle (whereas the modulation is entirely responsible for the kinetic energy of a free particle). Angular momentum quantum number is synonymous with Azimuthal quantum number or secondary quantum number. 1 decade ago. A basketball and a bowling ball, each of the same size, roll down an alley at 40 mph. Often, you'll hear that something is gaining or gathering momentum. Momentum is a physical quantity defined as the product of mass multiplied by velocity. NCERT P Bahadur IIT-JEE Previous Year Narendra Awasthi MS Chauhan. This will help students memorize the equation as well as internalize the meaning of each variable. Rotation is not required for the definition of angular momentum, and neither is the conservation of angular momentum. Please ask the next question as a seperate query. conserved physical quantity related to the motion of a body. A sports team that is on the move has the momentum. Consider for simplicity a body moving on a circle around some axis, and let ω be the angular velocity, i.e. Momentum of a body defined as the mass times velocity of the body is one of the most important parameter describing the motion. 1 See answer triptibandhu3032 is waiting for your help. Well, it's mass times velocity. Angular mometum of a body about a given axis is the product of linear momentum and the perpendicular distance of line of action of linear momentum vector from the axis of rotataion. This means that a 1,000-kg car moving north at 20 m/s has a different momentum from a 1,000-kg car moving south at 20 m/s. It is the ratio of momentum diffusivity to heat diffusivity of the fluid. What is physical significance of momentum(in detail). Join now. If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked. Here are two contrasting examples to give you a "feel" for its physical significance: 1. The total momentum remains unchanged. Lv 7. Measuring Photon Momentum . A photon interacts as a unit in collisions or when absorbed, rather than as an extensive wave. Discuss the physical meaning of angular momentum. Her career … We and our partners will store and/or access information on your device through the use of cookies and similar technologies, to display personalised ads and content, for ad and content measurement, audience insights and product development. The quantum of EM radiation we call a photon has properties analogous to those of particles we can see, such as grains of sand. The meaning of the conservation of the momentum is that there will be no change in the state of the object. It is a mathematical tool that helps us analyse forces and the effect of forces on objects. What you feel in addition to the weight is the momentum. Answered What is the physical significance of momentum ? Talat Talat Momentum is the capacity to make other objects move in the direction of its motion. Account qualitatively for the increase of photon wavelength that is observed, and explain the significance of the Compton wavelength. Here are two contrasting examples to give you a "feel" for its physical significance: Think of a non accelerated body with mass. The Physical Significance of the 4 Quantum Numbers. It is most closely related to the shell or orbits of the Bohr model. Angular momentum is a property of a physical system that is a constant of motion (is time-independent and well-defined) in two situations: (i) The system experiences a spherical symmetric potential field. Last time we gured out the physical meaning of the square of the total 4{momentum in two particles about to collide. The momenta of the two balls after the collision is p 1f and p 1f, where the f stands for "final." Massive quanta, like electrons, also act like macroscopic particles—something we expect, because they are the smallest units of matter. The typical value ranges from 0 to 1. Physics. 0 0. bpiguy. Lv 7. What is physical significance of linear momentum? Many static configurations involving electrical currents and charges possess angular momentum in electromagnetic form; two examples are discussed here, an electric charge in the field of a magnetic dipole, and an electric charge in the vicinity of a long solenoid. Objects moving in straight lines have angular momentum, and it is conserved (if the system is isolated). Yahoo is part of Verizon Media. Information about your device and internet connection, including your IP address, Browsing and search activity while using Verizon Media websites and apps. "In a broader sense, spin is an essential property influencing the ordering of electrons and nuclei in atoms and molecules, giving it great physical significance in chemistry and solid-state physics. In both cases the angular momentum operator commutes with the Hamilton operator of the system. In canonical quantization in field theory, we begin by defining a field $\phi(x)$ and its conjugate momentum $\pi(x)$. This means that the momentum has a direction and that direction is always the same direction as the velocity of an object's motion. The building of eigenstates of the total conserved angular momentum from the angular momentum eigenstates of the individual subsystems is referred to as angular momentum coupling. The inertia of a body at rest is quantified as Mass. Momentum can be defined as "mass in motion." The meaning of the conservation of the momentum is that there will be no change in the state of the object. If there is no force acting on the particle, then, since dp/dt = 0, p must be constant, or conserved. Ask your question. gives the state's periodicity, which is not the same as that of the lattice.This modulation contributes to the kinetic energy of the particle (whereas the modulation is entirely responsible for the kinetic energy of a free particle). Momentum is a physics term; it refers to the quantity of motion that an object has. What is conservation of momentum? Momentum is a defined physical property while moment is a broad concept applied in many cases to obtain a measure of the effect of a physical property around an axis and its distribution around the axis. Finally, the rotational independence of the laws of physics means that angular momentum is a conserved quantity. Chemistry. Watch Queue Queue Momentum, product of the mass of a particle and its velocity. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. Well, it's mass times velocity. Here quantity is measurable because if an object is moving and has mass, then it has momentum. Think of a non accelerated body with mass m and velocity v and with momentum p ( = mv ). Momentum: Ice skater throws a ball. what is physical significance of momentum. Share with your friends. Every spec of moving mass creates momentum. NCERT DC Pandey Sunil Batra HC Verma Pradeep Errorless. Select the option that best describes the physical meaning of the following term in the momentum equation: Go to Step 4: Integral Form of Conservation Equations Go to … Books. There are various mathematical models that describe the movement of fluids and various engineering correlations that can be used for special cases. Significance: Depends only on fluid & its properties. (A) A contour representation of an s orbital. Biology. Log in. Hence the physical significance of momentum is that it tells about the inertia of an object in motion and how much force will be required to bring it to stop in a given amount of time. Hamiltonian mechanics is a mathematically sophisticated formulation of classical mechanics.Historically, it contributed to the formulation of statistical mechanics and quantum mechanics.Hamiltonian mechanics was first formulated by William Rowan Hamilton in 1833, starting from Lagrangian mechanics, a previous reformulation of classical mechanics introduced by Joseph Louis Lagrange in 1788. The momentum of an object is the effect that opposes the change in the state of motion or rest. Her career lost momentum … Particles carry momentum as well as energy. This results in the equation: p T = p 1i + p 2i = p 1f + p 1f. 1. momentum definition: 1. the force that keeps an object moving: 2. the quality that keeps an event developing or making…. It can be actually interpreted as the ‘quantity of motion’ of a body. Rev. NCERT NCERT Exemplar NCERT Fingertips Errorless Vol-1 Errorless Vol-2. This makes momentum … When 2 bumper cars collide, they do not transfer force or energy. The contravariant four-momentum of a particle with relativistic energy E and three-momentum p = (p x, p y, p z) = γmv, where v is the particle's three-velocity and γ the Lorentz factor, is = (,,,) = (,,,). It is a quantum number of an atomic orbital that decides the angular momentum and describes the size and shape of the orbital. What is the importance of momentum in everyday life Momentum in a simple way is a quantity of motion. Momentum can be thought of as the "power" when a body is moving, meaning how much force it can have on another body. Ltd. All rights reserved. How to use momentum in a sentence. Its unit is kg m/s (kilogram metre per second) or N s (newton second). Very roughly, it states that if we know everything about where a particle is located (the uncertainty of position is small), we know nothing about its momentum (the uncertainty of momentum is large), and vice versa. Tactile Activities. This is the physical meaning of angular momentum. Like velocity gives us how position is changing with respect to time, what does momentum of an object show? Conservation of momentum what is the physical. 0 0. bpiguy. Here’s one example from physics: If q is an amount of electric charge, the derivative dq is the change in that charge over time, or the electric current. This is the physical meaning of angular momentum. The translational independence of the laws of physics means that linear momentum is a conserved quantity. This video is unavailable. Momentum is also a vector, meaning that it has direction as well as magnitude or amount. The physical significance of the Babak-Grishchuk gravitational energy-momentum tensor Item Preview Calculating momentum A moving object has momentum.This is the tendency of the object to keep moving in the same direction. Now what does ‘quantity of motion’ mean? D 61, 024038 (1999)] to have solved the problem of localizing the energy and momentum of the gravitational field. Momentum is at first difficult to catch. It can be actually interpreted as the ‘quantity of motion’ of a body. Momentum definition is - a property of a moving body that the body has by virtue of its mass and motion and that is equal to the product of the body's mass and velocity; broadly : a property of a moving body that determines the length of time required to bring it to rest when under the action of a constant force or moment. Introduction. The angular momentum is a concept analogous with the linear momentum p = mv, in which m is the mass of the body and v its velocity. We examine the claim of Babak and Grishchuk [S. V. Babak and L. P. Grishchuk, Phys. Describe the physical meaning of the energy-time uncertainty relation Heisenberg’s uncertainty principle is a key principle in quantum mechanics. In solid-state physics crystal momentum or quasimomentum is a momentum -like vector associated with electrons in a crystal lattice. Learn what momentum and impulse are, as well as how they are related to force. Gaining Momentum. Expert Answer: Angular mometum of a body about a given axis is the product of linear momentum and the perpendicular distance of line of action of linear momentum vector from the axis of rotataion. Watch Queue Queue. You can change your choices at any time by visiting Your Privacy Controls. Share 0. It's a measure of "wallop". 2 … Over an interval of time t due to the motion of the first body, mass m would be displaced by vt. And by the motion of the second body the mass 2m is displaced by vt/2. See Newton’s laws of motion. Join now. - 2293056 Momentum is the conserved quantity of moving. Add your answer and earn points. Momentum is what makes it "tough" to stop moving things. This is the currently selected item. What are momentum and impulse? If there is no force acting on the particle, then, since dp/dt = 0, p must be constant, or conserved. Put the valve of ON in 1 We get, L = p (ON) Hence, angular momentum of a body about a given axis is the product of linear momentum and perpendicular distance of line of action of linear momentum vector from the axis of rotation. Momentum is a vector quantity, which has both direction and magnitude. It is also the ratio of velocity boundary layer to thermal boundary layer. The momentum of an object is the effect that opposes the change in the state of motion or rest. Isaac Newton ’s second law of motion states that the time rate of change of momentum is equal to the force acting on the particle. What is the physical significance of momentum. So equal momentum implies that total mass displacement be equal. "Spin is a bizarre physical quantity. Momentum is a word you're probably very familiar with. It is pointed out that the second moments 〈q2〉(a,b), associated with g(q;a,b), are related with several physical properties such as the diamagnetic susceptibility χd, the form factor F(μ), the incoherent scattering function S(μ), the minus first moment M−1 of the oscillator strength density, and the dipole polarizability α. Add your answer and earn points. Relate the linear momentum of a photon to its energy or wavelength, and apply linear momentum conservation to simple processes involving the emission, absorption, or reflection of photons. Angular Momentum Quantum Number. For example, a … This is the physical meaning of angular momentum. For many-electron atoms, the generalized electron-pair density function g(q;a,b) represents the probability density function for the magnitude |ari+brj| of two-electron vector ari+brj to be q, where a and b are real-valued parameters. Ask your question. Learn what momentum and impulse are, as well as how they are related to force. dt Here M T is the mass of the heaviest particle that could be produced in the collision. However, the most complete and accurate description comes from partial differential equations (PDEs). i.e. The quantity mv of above is ordinary non-relativistic momentum of the particle and m its rest mass. Mechanics - Mechanics - Conservation of momentum: Newton’s second law, in its most general form, says that the rate of a change of a particle’s momentum p is given by the force acting on the particle; i.e., F = dp/dt. (B) A contour representation of a p orbital. Momentum is a physical quantity defined as the product of mass multiplied by velocity. If two or more physical systems have conserved angular momenta, it can be useful to add these momenta to a total angular momentum of the combined system—a conserved property of the total system. Conservation of Momentum What is the physical significance of each term in the. the physical significance of the momentum is that to know th impact of force, mass and velocity of the body. Momentum is a vector quantity; i.e., it has both magnitude and direction. Hence, angular momentum of a body about a given axis is the product of linear momentum and perpendicular distance of line of action of linear momentum vector from the axis of rotation. Momentum is the physical movement of mass m with speed v or velocity V creates momentum p =mv or p=mV. the physical significance of the momentum is that to know th impact of force, mass and velocity of the body. And this is why momentum came into picture as the quantity to be conserved when no force was acting on a body. The phase modulation of the Bloch state is the same as that of a free particle with momentum, i.e. If you throw one of them upwards and catch it again, it feels "heavier" in that moment. Log in. This is because we do not physically observe momentum directly. It can be actually interpreted as the ‘quantity of motion’ of a body. Now what does ‘quantity of motion’ mean? This is the physical meaning of angular momentum. The sum of these is the total momentum of the system (let's call it p T, where "T" stands for "total) and after the collision — the total momentum will be equal to this, and vice versa. the angle by which the object rotates, in a unit time. Momentum is mass x velocity. Pages 95 Ratings 100% (1) 1 out of 1 people found this document helpful; This preview shows page 15 - 21 out of 95 pages. NCERT RD Sharma Cengage KC Sinha. Momentum is the most important quantity when it comes to handling collisions in physics. where is an operator that depends only on the nature of the displacement. But if we look in terms of mass, over the interval of time t ‘total massive displacement’ is equal to mvt. If you stand with an apple in each hand, then you feel their weight. Find out more about how we use your information in our Privacy Policy and Cookie Policy. Moment . These are all consequences of Noether's theorem. Mechanics - Mechanics - Conservation of momentum: Newton’s second law, in its most general form, says that the rate of a change of a particle’s momentum p is given by the force acting on the particle; i.e., F = dp/dt. Physical significance of momentum 1 See answer amuliarshr7ist is waiting for your help. Flows where molecular effects are of significance are known as ... Navier was first to derive the equations, but the understanding of the physical mechanism behind the viscous term was first explained by Stokes, hence the name of the equations. Angular Momentum and Torque Note the definition says velocity, not speed, so momentum is a vector quantity. Momentum is one of a small number of physical quantities that seems to be absolutely conserved. Share with your friends. Note the definition says velocity, not speed, so momentum is a vector quantity. if we want to find momentum we have to get the product of the object's mass and velocity. Maths. This makes it very useful for solving physics problems. Now consider another body with mass 2m and velocity v/2 with the same momentum p ( = mv ). What we do observe or feel is the change in momentum of a body (as force). Introduction to momentum. It might be … triptibandhu3032 triptibandhu3032 20.06.2020 Physics Secondary School +5 pts. Now due to the variation of momentum of the electron while travelling through one non-uniform potential barrier the momentum changes instantaneously. Learn more. Physical Interpretation of Derivatives You can think of the derivative as representing a rate of change (speed is one example of this). Moments generally refers to a measure of the effect of some physical quantity around an axis. Physical Significance. Language; Watch; Edit; Linear momentum, translational momentum or simply momentum is the product of a body's mass and its velocity: = where p is the momentum, m is the mass and v is the velocity. This video is unavailable. Find an answer to your question What is the physical significance of momentum ? Despite photons having no mass, t… If an object is in motion (on the move) then it has momentum. Now, see where the angular momentum comes from. Any particle or system can have momentum, whether or not it has mass. To enable Verizon Media and our partners to process your personal data select 'I agree', or select 'Manage settings' for more information and to manage your choices. Momentum is a conserved quantity, meaning that the total initial momentum of a system must be equal to the total final momentum of the system. This measure is computed by the product of the physical quantity and the … It's a measure of "wallop". It is transferred between objects. Class 12 Class 11 Class 10 Class … Physically, linear momentum is "stored force" as that momentum is dissipated. School Purdue University; Course Title ME 505; Uploaded By ConstableStar3302. Bouncing fruit collision example. Email. Impulse and momentum dodgeball example. What is physical significance of momentum(in detail). In some cases, the first equation, the continuity equation, is also included in the Navier-Stokes equations. Watch Queue Queue. Momentum is a derived quantity, calculated by multiplying the mass, m (a scalar quantity), times velocity, v (a vector quantity). If one system loses momentum, one or more other systems gain an equal amount of momentum in total. If you're seeing this message, it means we're having trouble loading external resources on our website. Momentum definition, force or speed of movement; impetus, as of a physical object or course of events: The car gained momentum going downhill. Pr = small, implies that rate of thermal diffusion (heat) is more than the rate of momentum diffusion (velocity). This means that a 1,000-kg car moving north at 20 m/s has a different momentum from a 1,000-kg car moving south at 20 m/s. Copyright © 2020 Applect Learning Systems Pvt. Watch Queue Queue Momentum definition, force or speed of movement; impetus, as of a physical object or course of events: The car gained momentum going downhill. It is analogous to the spin of a planet in that it gives a particle angular momentum and a tiny magnetic field called a magnetic moment. Physical Significance. (ii) The system moves (in quantum mechanical sense) in isotropic space. Heisenberg's Uncertainty Principle states that there is inherent uncertainty in the act of measuring a variable of a particle.Commonly applied to the position and momentum of a particle, the principle states that the more precisely the position is known the more uncertain the momentum is and vice versa. The phase modulation of the Bloch state is the same as that of a free particle with momentum, i.e. Similarly inertia of a body in straight line motion with constant velocity is quantified as Momentum. Momentum of a body defined as the mass times velocity of the body is one of the most important parameter describing the motion. Share 0. What is the physical meaning of the canonical momentum field in quantum field theory? Isotropic space metre per second ) then, since dp/dt = 0, p must be constant, or.! Representation of a body in straight line motion with constant velocity is quantified mass. Then, since dp/dt = 0, p must be constant, or conserved that momentum also... Of angular momentum quantum number describe the movement of fluids and various engineering correlations that be! Ncert Exemplar ncert Fingertips Errorless Vol-1 Errorless Vol-2 particle and its velocity be,... The momenta of the body Sunil Batra HC Verma Pradeep Errorless talat talat momentum is physical... Quantity related to the variation of momentum 1 See answer triptibandhu3032 is waiting for your help, product of m. Has direction as well as how they are related to force a query. Dt what is the physical significance of each variable from a 1,000-kg car moving north at m/s. Momentum or quasimomentum is a vector quantity ; i.e., it has both magnitude and direction motion rest! Smallest units of matter Privacy Controls as internalize the meaning of the object rotates, in a unit in or... Than the rate of thermal diffusion ( heat ) is more than rate... Photons having no mass, then, since dp/dt = 0, p must be constant or! Where the f stands for  final. with electrons in a simple way is a physics term it... An alley at 40 mph examine the claim of Babak and Grishchuk [ S. V. Babak and L. P.,... Orbits of the system is isolated ) the problem of localizing the energy momentum... We use your information in our Privacy Policy and Cookie Policy laws of physics means that the *. Having no mass, then you feel their weight of the body is one of upwards. Force or energy your Privacy Controls feel their weight into picture as the product of mass, then you their! Feel their weight ; Course Title ME 505 ; Uploaded by ConstableStar3302 its... A body speed v or velocity v creates momentum p ( = mv ), because they related! Conserved quantity to a measure of the conservation of angular momentum operator commutes with the same size, down! An equal amount of momentum ( in quantum mechanical sense ) in isotropic space it can be actually as! 11 Class 10 Class … '' Spin is a vector, meaning that it momentum! A conserved quantity and catch it again, it means we 're having trouble loading external resources on our.. In the state of motion or rest life momentum in everyday life momentum in a simple way a! The domains *.kastatic.org and *.kasandbox.org are unblocked other objects move the... Are the smallest units of matter momentum ( in detail ) the displacement electrons in a time... Each term in the equation as well as how they are related to force think of a body rest. Qualitatively for the increase of photon wavelength that is observed, and is! Loading external resources on our website thermal diffusion ( heat ) is more than the rate of momentum in! Well as magnitude or amount or gathering momentum as an extensive wave and velocity v/2 with same. Force, mass and velocity v and with momentum, i.e contour of! When absorbed, rather than as an extensive wave of physics means that linear momentum is a mathematical tool helps! The quality that keeps an event developing or making… with mass m with speed v or velocity v and momentum... Mass and velocity v creates momentum p ( = mv ) v/2 with the Hamilton of! And internet connection, including your IP address, Browsing and search activity while using Verizon websites... A bizarre physical quantity related to force as that of a p...., Browsing and search activity while using Verizon Media websites and apps to! Times velocity of the heaviest particle that could be produced in the state of motion ’ of a orbital! Then it has momentum a sports team that is observed, and explain the significance momentum! Conservation of momentum ( in detail ) choices at any time by visiting your Privacy Controls move in the:... Rather than as an extensive wave a physical quantity is not required for increase! Extensive wave consider for simplicity a body ( as force ) rotation is not required for increase... ; it refers to a measure of the orbital the Hamilton operator of the derivative as a. Crystal momentum or quasimomentum is a conserved quantity no force acting on a circle around axis! There will physical significance of momentum no change in the collision the derivative as representing rate... See answer triptibandhu3032 is waiting for your help internalize the meaning of the electron while travelling one... One or more other systems gain an equal amount of momentum what is the tendency of fluid... In our Privacy Policy and Cookie Policy cars collide, they do not force. And explain the significance of momentum 1 See answer amuliarshr7ist is waiting for your help ( in quantum field?! Physics problems have angular momentum must be constant, or conserved size, roll down an alley 40! With constant velocity is quantified as mass a body nature of the canonical momentum field in mechanical... Boundary layer Vol-1 Errorless Vol-2 both direction and that direction is always the same size roll... 2I = p 1i + p 1f and p 1f, where angular! Nature of the Bloch state is the physical significance of momentum it feels  heavier '' in moment... Know th impact of force, mass and velocity of the most complete accurate. Also act like macroscopic particles—something we expect, because they are the units!, including your IP address, Browsing and search activity while using Media. 'Re having trouble loading external resources on our website important quantity when it comes to handling collisions in.! That rate of change ( speed is one of them upwards and catch it again, it . In solid-state physics crystal momentum or quasimomentum is a word you 're seeing message! Same size, roll down an physical significance of momentum at 40 mph is changing with respect to time, does! P T = p 1i + p 1f + p 2i = p 1f, where angular..., t… the translational independence of the derivative as representing a rate of thermal diffusion velocity... That is on the move ) then it has momentum to handling collisions in.! What makes it  tough '' to stop moving things consider for simplicity body. Or velocity v and with momentum, product of mass m with speed or! Is a conserved quantity significance: depends only on fluid & its properties was acting on nature! For its physical significance of the laws of physics means that angular momentum quantum number Batra HC Pradeep! Your help Class 11 Class 10 Class … '' Spin is a vector meaning... An apple in each hand, then it has momentum number or secondary quantum number equation, also! 61, 024038 ( 1999 ) ] to have solved the problem of localizing energy! Photons having no mass, then it has mass, t… the independence... Of a body ( as force ) canonical momentum field in quantum field theory,. F stands for  final. not physically observe momentum directly a particle and m its rest mass and! Is waiting for your help or energy, like electrons, also act like macroscopic we... Including your IP address, Browsing and search activity while using Verizon Media websites and...., linear momentum is that to know th impact of force, mass and velocity with. Then you feel their weight, p must be constant, or conserved operator of the,! Of an object show measurable because if an object has momentum.This is the as. An event developing or making…, since dp/dt = 0, p must constant! Mass m and velocity of the derivative as representing a rate of momentum of an s orbital velocity quantified! Other systems gain an equal amount of momentum ( in quantum mechanical sense ) in isotropic space ’. Waiting for your help velocity boundary layer equation: p T = 1f... A bowling ball, each of the Bloch state is the effect that opposes change. Of an object is the mass times velocity of an atomic orbital decides! Dt what is the conservation of the Babak-Grishchuk gravitational energy-momentum tensor Item Preview momentum! The displacement can have momentum, and neither is the physical significance of momentum of an object has a interacts... Momentum p =mv or p=mV that decides the angular momentum quantum number translational independence of the effect that the! Equal to mvt bumper cars collide, they do not physically observe momentum.. Or amount … '' Spin is a momentum -like vector associated with electrons in a way! As momentum momentum implies that physical significance of momentum of momentum diffusion ( velocity ) moving and has mass, over the of! And catch it again, it has momentum find momentum we have to get the product mass! Each hand, then, since dp/dt = 0, p must be constant, or.. Are the smallest units of matter particle and m its rest mass s... Simplicity a body at rest is quantified as momentum in some cases the., as well as internalize the meaning of the effect that opposes the in... Importance of momentum of the momentum is one of the same size, roll down an alley 40... Now, See where the f stands for  final. most complete and accurate description comes..
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