Impulse Flashcards
1
Q
what is impulse?
A
A change in momentum or a given force for a certain amount of time.
2
Q
Explain how the impulse equation can be derived from F = ma
A
F = ma ( or F = m x Πv/t) → F. t = mΠv
Impulse is equal to change momentum.
Impulse is equal to force x time.
3
Q
What is the impulse equation?
A
F x t = m x Πv
4
Q
Give some examples where people try to reduced the force experienced during a collision.
A
- Boxer moves backward as he gets punched to increase the time the punch lasts in order to reduce the force he experiences.
- Tennis player will try to keep racket in tact with the ball for as long as possible to increase impulse that it experiences and hence greater change in velocity.
- Cars have crumple zones so a car crash lasts longer and the force experienced is reduced.