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Newton's First Law is about inertia. Inertia is when an object remains in motion or at rest unless acted upon by a force. Here is an example.
This ball is at rest. It does not yet have inertia. But when I kick it, it gains inertia and starts to move.
Newton's Second Law States that if an object has a bigger mass, it wall take a bigger force to move it. That means, the bigger the force, the more acceleration. Let's look at an example.
There is a small car and a big ambulance. They are racing each other. The small car will take a small amount of force to start and stop because it has less mass. The ambulance will need a bigger force to start it and a bigger force to stop it because it has a much bigger mass with causes more momentum.
Newton's Third Law states that for every action, there is an equal and opposite reaction. We are at a school so I can show you what that means.
This adult just shot a basketball. It hit the backboard and bounced off. It bounced off because the ball hit the backboard and there was a reaction. The ball bounced off and the hoop wiggled back and forth. It only wiggled because it was bolted to the ceiling and it has a lot more mass than the ball.
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