The change of motion is caused by the unbalance force.
Force is defined as the push or pull applied to the body. Sometimes it is used to change the shape, size, and direction of the body.
Because of unequal force or strength applied to one side of an object, an unbalanced force causes a change in motion, speed, direction, or movements.
In the event of imbalanced forces, one side has more energy than the other even when opposing sides have forces working against them.
Hence the unbalance force is responsible for the changes in motion.
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