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This section covers the work-energy principle, definitions of work, and calculations involving forces and displacements. Key concepts include how to calculate work done by forces, understanding positive and negative work…
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A body constrained to move in y-direction is subjected to a force given by, F = (-2i + 15j + 6k) N. The work done by this force in moving the body a distance of 10 m along the y-axis is.
150 J
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A man pushes a wall and fails to displace it. He does
no work at all
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A uniform chain has mass M and length L and it is lying on a smooth horizontal table with half of its length hanging vertically down. The work done in pulling the chain up the table is.
MgL/4
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A position dependent force F is acting on a particle and its force-position curve is shown in the figure. Work done on the particle, when its displacement is from 0 to 5 m is.
25 J
The full exam-length answer is in the app.
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