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15-force and motion 2

# 15-force and motion 2 - PHYS 211 Force and Motion Newtons...

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PHYS 211 2/18/09 Force and Motion Newton’s Laws

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Newton’s Laws 1 st ) A body at rest remains at rest, a body in motion remains in motion, unless acted on by a net, outside force. 2 nd ) F =m a 3 rd ) For every applied force, there is an equal and opposite reaction force created. Inertial Reference Frames
Race Car From rest, you step on the gas of your Ferrari, providing a force F for 4 secs , speeding it up to a final speed v. If the applied force were only (1/2) F , how long would it have to be applied to reach the same final speed ? 1) 16 s 2) 8 s 3) 4 s 4) 2 s 5) 1 s

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Force on Two Masses A force F acts on mass m 1 giving an acceleration a 1 . The same force acts on a different mass m 2 giving an acceleration a 2 =2a 1 . If m 1 and m 2 are glued together and the same force F acts on this combination, what is the resulting acceleration? F a 1 m 1 F m 2 m 1 a 3 F a 2 = 2 a 1 m 2 1) 3/4 a 1 2) 3/2 a 1 3) a 1 4) 4/3 a 1 5) 2/3 a 1
Gravitational Force The Gravitational Force: It is the force that the Earth exerts on any object (in the picture a cantaloupe). It is directed toward the center of the Earth.

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