Newton's Laws of Motion

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Motion

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DYNAMICS

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BASICS BIOMECHANICS

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WJEC AS Physics

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Newton's Laws of Motion

Newton's Third Law

Action reaction forces can cause a change in motion, act on different objects, and cause an equal by opposite reaction

Momentum - The result of mass of an object times the object's velocity

Action reaction forces are equal in strength but opposite in direction

Force may be equal but mass of objects determine the effect of force.

For every action, there is an equal and opposite reaction

Newton's Second Law

As force increases, acceleration increases

As mass increases, acceleration decreases

Unbalanced forces cause acceleration of an object

Force = mass * acceleration (F=ma)

Acceleration depends on both force and mass

Newton's First Law

Object remains at rest or remains at a constant velocity if net force = zero

Movement occurs when there is a net force acting on an object

Net Force = sum of all forces acting on an object

Inertia = tendency of an object to resist a change in motion

Object at rest will remain at rest and an object in motion will remain in motion unless acted upon by an outside force.