Newton's Third Law Calculator

Find the equal and opposite reaction force.

Reaction force (N) -40

Formula: reaction = − action

Step-by-step with your numbers:

1. Values used:

2. Action force = 40 N

4. Reaction force = -40N

Did we solve your problem today?

For every action there is an equal and opposite reaction.

The math behind it

The reaction force has the same magnitude as the action but points in the opposite direction.

Push a wall with 40 N and it pushes back with 40 N.

Do the forces cancel out?

No — they act on different objects, so neither cancels the other.