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A bicycle is supported so that it is stopped from falling sideways but can move forwards or backwards; its pedals are in their highest and lowest positions.
A student crouches beside the bicycle and applies a horizontal force, directed towards the backwheel, to the lower pedal.
(i) Which way does the bicycle move?
(ii) Does the chain-wheel rotate in the similar or opposite sense as the rear wheel?
(iii) Which way does the lower pedal move relative to the ground?
Viscosity in fluids is the analog of friction in solids. Both are methods by which the kinetic energy of moving bodies can be changed into thermal power. In the absence of friction
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what is elastic collision
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