Question

What is the third law of motion?

Answer 1

If you press against a corner of this textbook with your fingertip, the book pushes back and makes a small dent in your skin. If you push harder, the book does the same and the dent in your skin is a little larger. This simple experiment illustrates a general principle of critical importance known as Newton’s third law:

If two objects interact, the force F12 exerted by object 1 on object 2 is equal in magnitude and opposite in direction to the force F21 exerted by object 2 on object 1:

Answer 2

Heya...

Here is your answer....

Third law of motion:

The third law of motion is action to reaction.

When an object exerts a force on an other object, the second object also exerts a force on the first one which is equal in magnitude but opposite in direction.