P10 - Force And Motion Flashcards
1
Q
What does newton’s second law say?
A
Force = mass x acceleration (F = ma)
2
Q
What is terminal velocity?
A
When an object falls and the force of air resistance balances its weight, so it falls at constant speed
3
Q
How do forces affect braking (cars)
A
The bigger the force applied, the quicker the car stops
4
Q
What is momentum?
A
A measure of motion.
Momentum = mass x velocity
5
Q
What happens in a collision (momentum)?
A
Momentum is conserved ( total before = total after), unless an external force acts
6
Q
What is elasticity?
A
An objects ability to return to its original shape after being stretched or compressed.
