(5) Momentum Flashcards
1
Q
What is the equation for momentum?
A
Momentum = mass x velocity
2
Q
What is the unit of momentum?
A
Kg m/s (kilogram meters per second)
3
Q
In a closed system, what happens to momentum before and after a collision?
A
The total momentum before is equal to the momentum after the event (conservation of momentum)
4
Q
What is the equation linking momentum, force and time?
A
Change in momentum = force x time
5
Q
What quantity is equal to the force experienced in a collision?
A
The rate of change of momentum
6
Q
If an objects change if momentum is fixed, what is the only way to reduce the force that the object experiences?
A
Increase the length of time over which the change of momentum occurs
7
Q
How does a seatbelt improve the passengers safety during a collision?
A
- seatbelts increase the time over which the force is applied, reducing the rate of change of momentum and therefore reducing the force experienced
