Changes in momentum

Question 1

When a non-zero resultant force acts on a moving object, it causes velocity to change.
What is there a change of when this happens?

Answer 1

Momentum

Question 2

What is the equation to work out the change in momentum :

Answer 2

Force (N) = change in momentum (kg m/s ) / change in time (s)

Question 3

The force causing the change is equal to the ?

Answer 3

The force causing the change is equal to the rate of change of momentum

Question 4

True or false: a smaller force means a faster change of momentum.

Answer 4

False: A larger force means a faster change of momentum.

Question 5

What safety features do cars have ?

Answer 5

Seat belts stretch - slightly increasing the time taken
for the wearer to stop

Air bags unfair before you hit the dashboard of the car. The
compressing air inside slows you down more gradually than if you had just hit a hard dashboard.

Question 6

What safety features to bike helmets have ?

Answer 6

They contain a crushable layer of foam which helps
to leg them the time taken for you head to stop in a crash. This reduces impact on your brain.

Question 7

What safety features do crash mats have ?

Answer 7

They increase the time taken for you to stop if you fall on them.
This is because they are made from soft, compressible materials.