Let’s try something – jump as high as you can!

How are you launching yourself upwards? Your feet are pushing into the ground which pushes your body upwards.

For every action, there is an equal and opposite re-action. If object A exerts a force on object B, object B also exerts an equal and opposite force on object A. In other words, forces result from interactions.

This means that when you push on a wall, the wall pushes back on you with a force equal in strength to the force you exerted.

In the first law, an object will not change its motion unless a force acts on it. In the second law, the force on an object is equal to its mass times its acceleration. In the third law, when two objects interact, they apply forces to each other of equal magnitude and opposite direction.

This is a really simple explanation of Newton’s Third Law: Newton’s Third Law of Motion | Newton’s Laws of Motion | Video for Kids 

Here is a balloon experiment demonstrating it: Balloon Rocket! Newton’s Third Law of Motion.