Force & Momentum Change
Physics: AQA GCSE Higher, topic 5.3.9
Force and Momentum Change
When a force acts on an object that is moving, or able to move, a change in momentum happens. Force equals the rate of change of momentum. This can be shown by combining two equations:
Acceleration and momentum
- acceleration = change in velocity ÷ time taken.
- a = Δv ÷ t.
Force and acceleration
- Force = mass × acceleration.
- F = m x a.
Force = rate of change of momentum
- Combining the 2 equations we get F = m x Δv ÷ t.
- F = m Δv ÷ t.
- F = Δp ÷ t.
- Force = change in momentum ÷ change in time.
- In other words, force is equal to the rate of change of momentum.
Test yourself on Force & Momentum Change
The rate of change of momentum is equal to what?