Forces

Q1-3. Which of these forces....

1. ...does a fridge magnet use?

2. ...keeps the Moon in orbit around the Earth?

3. ...acts between surfaces to stops things moving?
4.This car has been shaped so that it has less air resistance than a school bus.

We say it has been ...

  • A. smoothed
  • B. de-blocked
  • C. frictionised
  • D. streamlined
  

5. Here are 4 things you can wear on your feet. For which one do we want the least friction?

  • A. Basketball shoes
  • B. Skis
  • C. Running shoes
  • D. Hiking boots

6. Forces can do many things to a moving tennis ball. Which one of these can it not do?

  • A. Change its mass
  • B. Change its shape
  • C. Change its speed
  • D. Change its direction
 tennis ball

7-10: Here is a picture of a car that is moving. The forces acting on it have been simplified and are shown as 4 single arrows labelled P, Q, R and S.

Force Q is equal in size to S, and force P is equal to R.

 

7. What will the car do?

  • A. Speed up
  • B. Stay at the same speed
  • C. Slow down
  • D. Stop

8. What is the name given to forces like this that cancel out?

  • A. Balanced forces
  • B. Equalised forces
  • C. Zeroed forces
  • D. Net forces
9. To make the car speed up , force must increase .
10. Air resistance is shown by force .