For an object to be considered in motion, there must be a force. A force is a push or pull that causes an object to move, change direction, change speed, or stop. ... Not all forces cause motion, however. Some forces, like gravity and friction, resist or work against movement.
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For an object to be considered in motion, there must be a force. A force is a push or pull that causes an object to move, change direction, change speed, or stop. ... Not all forces cause motion, however. Some forces, like gravity and friction, resist or work against movement.