Given what we know about Newton's third law of motion, we can confirm that when you push a door, you are exerting a force on the door which is enough to push it, while at the same time, the door is exerting the same force back onto you.
What is Newton's third law of motion?
- The third law of motion states that for every action, there is an equal and opposite reaction.
- What this means is that when a force is exerted onto something, the object will exert the same force, in an opposite direction.
- In the case of the door, when you push the door, the door pushes you back with the same force, in the opposite direction that you are pushing.
- This is why if we try to push a solid wall, we will move instead of the wall.
Therefore, we can confirm that since Newton's third law of motion states that each force has an equal reaction of force in an opposite direction, then when you push a door with your hand to open it, the door is actually exerting the same force back onto you.
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