Question

Identify the type of work in the following cases.
i) A coolie walking on a horizontal platform with a load on his head.
ii) Work done by force of gravity on a body projected upwards.

Answer 1

Answer:

i Work done against gravity is zero as there is no displacement along or opposite to the direction of force of gravity

Work done against gravity is zero as there is no displacement along or opposite to the direction of force of gravityii When an object is lifted or projected upward, work must be done against the resistance from gravity, inertia and air resistance. If the object is moving upward at constant velocity, the work done by gravity is simply the force of gravity times the displacement.

Explanation:

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