Forces Cause Changes in Momentum

Question 1

What does a force do when it acts on an object?

Answer 1

It causes a change in momentum

Question 2

What is the formula relating time, force and change in momentum?

Answer 2

Force = change in momentum / time

Question 3

What is Force measured in?

Answer 3

N (Newton’s)

Question 4

What is change in momentum measured in?

Answer 4

Kg m/s

Question 5

What is time measured in?

Answer 5

s (seconds)

Question 6

What does a larger force mean?

Answer 6

A faster change of momentum

Question 7

What happens if someone’s momentum changes very quickly?

Answer 7

The forces on the body will be very large, and more likely to cause injury

Question 8

Why are cars designed to slow people down over a longer time when they crash?

Answer 8

The longer it takes for a change in momentum, the smaller the force

Question 9

What do crumple zones do?

Answer 9

Crumple on impact, increasing the time taken for the car to stop

Question 10

What do seat belts do?

Answer 10

Stretch slightly, increasing the time taken for the wearer to stop, reducing the forces acting on the chest

Question 11

What do air bags do?

Answer 11

Slow you down more gradually