The document discusses forces and dynamics. It introduces Sir Isaac Newton, who defined the three laws of motion. Dynamics looks at what causes motion by examining forces. Forces can be balanced or unbalanced. A balanced force results in no acceleration, while an unbalanced force results in acceleration in the direction of the net force. The effect of forces on an object's motion depends on whether the force and velocity are in the same direction, opposite directions, or at an angle to each other.
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