Clinical Anatomy & Biomechanics
Newton's Laws
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| Newton's First Law: The Law of Inertia states objects at rest remain at rest, objects in motion remain in motion, unless a force acts on the object. | ||
| Newton's Second Law: The Law of Acceleration states that acceleration of an object is directly proportional to the force causing it. Acceleration is in the same direction as the force and is inversely proportional to the mass of the object. The equation Force = Mass x Acceleration (F=MA) is used to describe Newton's Second Law. | ||
| Newton's Third Law: The Law of Reaction states that for every action there is an equal and opposite reaction. Ground Reaction Forces are an example of Newton's Third Law. | ||
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| Inertia: Inertia is the ability of a body to resist motion. The resistance of motion may be the initiation of motion (going from stationary to moving), a change in direction of motion (going from forward movement to backward movement) or the cessation of movement. Inertia is directly proportional to mass. Therefore, heavier objects (those with greater mass), will resist changes in motion better than lighter objects. An example of this would be trying to block or tackle a 300# offensive lineman versus trying to tackle or block a 150# halfback in football. | ||
| Conservation of Momentum: Conservation of Momentum tells us that energy is never lost, but simply transferred from one object to another. An example of this is the energy transferred from a baseball bat to a baseball when a pitch is hit. | ||
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