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Unformatted text preview: Summary Lecture 14
Definition of Impulse
J = F Δt
Useful in collisions with a time-varying force.
F is the average force during the collision,
Δt is the duration of the collision. Definition of Linear Momentum
p = mv
The momentum p is a vector in the direction
of the velocity.
the velocity. Impulse-Momentum Theorem
Impulse = Total momentum change
Total momentum change J = F Δt = Δp ( = mvFinal – mvInitial) Force and Momentum
Force and Momentum
A net force acting on a body changes
its momentum F = Δp/Δt
(this is another form of Newton’s 2nd law) Momentum Conservation
(in an isolated system) LINEAR MOMENTUM IS CONSERVED
pInitial = pFinal Example: Collision of 2 (hard) Objects
Collision of (hard) Objects
m1v1 + m2v2 = m1v1’ + m2v2’ ...
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