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An object at rest remains at rest. And an object in motion rat constant speed and in a straight line unless acted on by an unbalanced force.

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some opposing force will stop the ball from going any further.

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definition:a tendency to do something or to remain unchanged

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The action causes the person on the skateboard to go right,so he needs to push his foot off the ground left. Then he goes.,

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when you move the balls,the same amount of the balls move.EX-3 balls are moved,the same amount will move on the other side.

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Here's the formula for the second law-F times M= A
F=force
M=mass
A=acceleration