Impulse Flashcards
1
Q
Definition of impulse
A
The change of momentum experienced by a moving object when its velocity changes from an initial value U to the final value V.
2
Q
What is the symbol for impulse
A
∆p or i
3
Q
What is the formula of impulse?
A
i=∆p/t or m(v-u)/t
4
Q
What is the formula for force using impulse?
A
∆p/t = F or i = Fxt
5
Q
What is the unit for impulse?
A
Ns
6
Q
How to calculate Initial momentum?
A
pi = mu
7
Q
How to calculate final momentum?
A
pf = mv
8
Q
What are the 2 applications of impulse?
A
- The use of sand in long jump for a softer landing, a smaller stopping force is applied over a longer time.
- In a car crash, cars momentum is reduced to 0 in a very short time. Which is extended using crumple zones, air-bags and extendible seat belts. The average force needed to stop the car is reduced so injury to passengers is less.
9
Q
How to calculate change in momentum?
A
∆p = m(v-u)
∆p = pf-pi
