Law of Conservation of Momentum

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Momentum can be transferred when objects collide. The objects exert equal and opposite forces on each other, causing both objects to change velocity.

The ball on the left transfers its momentum thru the three middle balls to the ball on the right. The balls in the middle do not move.

When a car is hit from behind it lunges forward because momentum is transferred from the car in the back.

Momentum is Conserved:

If any interaction (objects colliding or pushing off from each other) momentum is conserved: the total amount of momentum doesn’t change. It is just redistributed!