Question
A machine reducing force vs reducing total work
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Answer
A machine only redistributes force over distance; friction can increase real input work.
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Question
Beam weight vs. center of mass in torque problems
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Answer
A beam's own weight acts at its center of mass and creates torque.
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Question
What makes a force conservative?
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Answer
Its work depends only on initial and final positions, not the path.
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Question
Newton's 2nd law
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Answer
Fnet=ma; use the net force, not a single force.
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