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Physics
Classical Physics
Mechanics
Ball rolling down a ramp, no slipping, + friction (conceptual question)
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[QUOTE="rcgldr, post: 5450487, member: 17595"] Usually static friction isn't considered as a force that performs work, since there's no movement between surfaces at the point of contact. If a flat bed truck is accelerating on a level road with a box on the flat bed without sliding so that the box accelerates at the same rate as the truck, then from the ground frame of reference the work performed on the box equals the friction force (between flat bed and box) times the distance traveled with respect to the ground, but the source of energy is the trucks engine, not friction force. Back to the ball rolling down a ramp, if you calculated the "work done" related to friction, that should equal the gain in angular kinetic energy of the ball, but the source of that energy is gravity, not the friction force. The total energy of the ball increases by m g h (mass, gravity, height of ramp), some of it linear kinetic energy, some of it angular kinetic energy. [/QUOTE]
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Classical Physics
Mechanics
Ball rolling down a ramp, no slipping, + friction (conceptual question)
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