4.2 Newtons 3rd Law

Question 1

Whenever two objects interact, they both feel a force. What is this pair of forces called?

Answer 1

An interaction pair

Question 2

How can you represent an interaction pair?

Answer 2

With a pair of vectors - arrows showing the relative size and direction of the forces

Question 3

What does Newton’s third law state?

Answer 3

When two objects interact, the forces they exert on each other are equal and opposite

Question 4

In Newton’s third law, does the “equal” part refer to the magnitude or direction?

Answer 4

Magnitude

Question 5

In Newton’s third law, does the “opposite” part refer to the magnitude or direction?

Answer 5

Direction

Question 6

What do you need for an object to be accelerated?

Answer 6

Either a high force or a small mass

Question 7

When pushing against a wall, the wall pushes back with an equal and opposite force. What is this force called?

Answer 7

The normal contact force