#### What is Newton’s Third Law of Motion?

Newton’s third Law of Motion states that for every action, there is an equal and opposite reaction. This means that when one object exerts a force on another object, the second object will exert an equal and opposite force on the first object.

This law applies to the force of gravity as well. When an object exerts a gravitational force on another object, the second object will exert an equal and opposite gravitational force on the first object. For example, the Earth exerts a gravitational force on the moon, and the moon exerts an equal and opposite gravitational force on the Earth. This is what causes the moon to orbit the Earth.

### Examples of Application of Newtons’s Third Law of Motion:

- When you sit in a chair, your weight exerts a force on the chair, and the chair exerts an equal and opposite force on you, supporting your weight.
- When a person walks, they push against the ground with their feet. The ground exerts an equal and opposite force on the person, which propels them forward.
- When a rocket launches, the exhaust gases exert a force on the rocket, propelling it upward. At the same time, the rocket exerts an equal and opposite force on the exhaust gases, causing them to shoot out the back of the rocket.
- When a ball is thrown against a wall, the ball exerts a force on the wall, and the wall exerts an equal and opposite force on the ball, causing it to bounce back.
- When a person swims in a pool, they push against the water with their arms and legs. The water exerts an equal and opposite force on the person, allowing them to move through the water.

Newton’s third law of motion and the law of gravitation both describe the fundamental nature of forces in the universe and how they act upon objects. The third law explains how forces are always equal and opposite, while the law of gravitation explains how the force of gravity acts between all objects with mass.