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the first law is more of about establishing a reference frame for the other two laws of motion. The first law is about inertia. It simply states that something will not change speed if there is no force acting on it.

a ball on a trolley is a good example, because when you pull the trolley, the ball moves backwards in the trolly, but doesnt move relative to the ground, the reason being that no forces are acting on the ball itself. Air hockey is another example, we will assume for this examply that its surface goes on forever. The air reduces the amount of friction, friction is a force. With no air, the puck can be pushed , but will come to a stop quite quickly, but with a reduction in friction, i.e. the air turned, it would take a lot longer for the puck to stop. Intuitively (this isn't quite rigourous), we can say that zero friction causes the puck to continue moving indefinitely.

But, for a complete understanding , you should take newtons laws together, rather than one at a time.

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