Newton's laws of motion

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How does the law of inertia effect the passengers in a car that is suddenly slowing down? (what will happen to the passengers)

They are abruptly pushed forward as their body wants to continue at the same speed as the train was traveling.

The force that causes objects to move in a circle is

centripetal force

When you kick a soccer ball and it moves the forces are _________ (balanced or unbalanced)

unbalanced

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