Physics Topic Practice

Newton's Third Law (Action-Reaction) | GCSE Physics

Newton's Third Law states that every action force has an equal and opposite reaction force.

If you pull on a rope, does the rope pull back?

What is Newton's Third Law (Action-Reaction) | GCSE Physics?

"The law stating that for every action force there is an equal and opposite reaction force."

Question 1

What is the resultant force on an object if a 10N force acts right and a 4N force acts left?

Question 2

Which of these is the correct vector equivalent of 'Distance'?

Question 3

An object moves at a constant velocity. What is the resultant force?

Question 4

What is the unit of the spring constant (k)?

Action & Reaction

Forces always occur in pairs.

The two forces act on DIFFERENT objects.

The forces are equal in magnitude and opposite in direction.

They must be the same type of force (e.g. both electrostatic).

Exam Tip

Interaction Fact: When you push on a wall, the wall pushes back on YOU with the exact same force.

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