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10_1425_web_Lec_15_Momentum

# 10_1425_web_Lec_15_Momentum - Momentum Physics 1425 Lecture...

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Momentum Physics 1425 Lecture 15 Michael Fowler, UVa

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Physics Definition of Momentum Momentum is another word (like work, energy, etc.) from everyday life that has a precise meaning when used in physics . To begin with, we discuss point particles (or small enough bodies they can be considered points). We’ll get to bigger things soon. The momentum of a particle of mass m moving with velocity is written v p mv = 
Momentum and Newton’s Second Law We’ve written Newton’s Second Law as In fact Newton wrote it (of course, in a different notation). This difference becomes important in relativity nothing can be accelerated beyond the speed of light , near that speed an applied force will cause an increase in the mass of an object. dv F ma m dt = = d dp F mv dt dt = =

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Momentum and Newton’s Third Law If two particles are interacting, Newton’s Third Law tells us the force from A on B and from B on A are equal and opposite : Assuming for the moment that no other forces are present,
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10_1425_web_Lec_15_Momentum - Momentum Physics 1425 Lecture...

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