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Biomechanical analysis of a motor-skill Skill Phases for Set-up movements Stability balance of weight Elastic energy muscle stretch. Preparation movement for Angular momentum Preparatory phase Wind-up phase Ground Reaction Force push back from ground Weight Transfer momentum and stability Chaining angular momentum is transferred in the body from one set of muscle groups to another Lever action for speed or force Impulse Length of distance a force is applied Stability balance of weight Force phase Recovery phase Newton’s Laws of Motion A force is a "push" or "pull" experienced by a mass m when it is accelerated. 1. Body at rest remains at rest and a body in motion continues to move at a constant velocity unless acted upon by an external force 2. A force F acting on a body gives it an acceleration “a” which is in the direction of the force and has magnitude inversely proportional to the mass “m” of the body. F = ma. 3. To every action there is an equal and opposite reaction.