Alex is pushing on a box. Why doesn't the box move even though Alex is pushing on it?
The force of friction is balancing the force of Alex's push.
When a meteor gets near the Earth, it curves toward the Earth. Why doesn't the Earth curve toward the meteor?
Though they are both exerting equal gravitational forces on each other, the Earth is much more massive, and thus does not move.
You use a ping pong ball to knock your friends water bottle off their desk. The water bottle falls backward, but the ping pong ball also bounces back towards you. Why does this happen?
Newton's 3rd Law: The ping pong ball exerted a force on the water bottle, but the water bottle exerted a force back on the ping pong ball, pushing it back.
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