CH 8: Momentum and Collisions Flashcards
1
Q
what is an impulse
A
a force applied over a period of time causes a change in motion
J = difference of momentum(p) = Fnet*difference of time
2
Q
what is momentum
A
p=mv
has direction
3
Q
what happens when an obj collides with another
A
experience equal and opposite changes in momentum
4
Q
what are the two types of collisions
A
inelastic and elastic
5
Q
what is an inelastic collision
A
a collision where the obj usually sticks together (perfectly inelastic)
conserves momentum but does NOT conserve total KET
6
Q
what is an elastic collision
A
objs bounce off eachother (think of elastic being bouncy)
both momentum and KE are conserved
has two equations to work with
𝑚𝐴𝑣⃗𝐴 + 𝑚𝐵𝑣⃗𝐵 = 𝑚𝐴𝑣⃗′𝐴 + 𝑚𝐵𝑣⃗′
and
𝑣⃗𝐴 − 𝑣⃗𝐵 = −(𝑣⃗𝐴
′ − 𝑣⃗𝐵′ )
