A person is pushing a box kept on a rough surface as shown below. Identify the force types P, Q and R acting on the box.

P - Muscular force, Q - Gravitational force, R - Frictional force

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P - Muscular force, Q - Frictional force, R - Gravitational force

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P - Gravitational force, Q - Frictional force, R - Muscular force

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P - Frictional force, Q - Gravitational force, R - Muscular force

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Solution

The correct option is B P - Muscular force, Q - Frictional force, R - Gravitational force
P is the force applied by the person on the box. Hence, P is muscular force. As the surface is rough and the block has a tendency to move towards right, friction will act along the surface and opposite to the applied force. Hence, Q represents frictional force. R represents gravitational pull of Earth which always acts vertically downwards.

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Similar questions

Group ‘A’	Group ‘B’
(i) An ox pulling a cart	(a) Magnetic force
(ii) Lifting a heavy iron object with a crane	(b) Electrostatic force
(iii) Weighing with a spring balance	(c) Muscular force
(iv) Applying brakes to a bicycle	(d) Gravitational force
(v) Picking up pieces of paper with a plastic scale	(e) Frictional force

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