Newton's 3rd law

Question 1

Formally state Newton’s 3rd Law (with reference to zero resultant force)

Answer 1

• If body A exerts a force on body B, then body B exerts an equal and opposite force on body A

Question 2

Identify Newton 3rd law pairs of forces in a given example, including systems

Answer 2

See notes page

Question 3

State the features common to both forces in an Newton 3rd law pair

Answer 3

The two forces are:
* Equal
* The same type of force
* Act over the same times
* Act on different bodies
* Act in opposite directions

Question 4

Appreciate the general concept of reaction forces

Answer 4

• If a person is standing on the earth, there will be a reaction force: an electromagnetic force of the ground on the person