Question

It is easier to roll a stone up a sloping road than to lift it vertical upwards because


A. work done in rolling is more than in lifting

B. work done in lifting the stone is equal to rolling it

C. work done in both is same but the rate of doing work is less in rolling

D. work done in rolling a stone is less than in lifting it

Answer 1

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Option D

• If you are lifting stone vertically upwards then you have to do work against the Gravitational force on stone .

• i.e. 'mg' and displacement will be equal to h. ... If you consider frictional force then rolling the stone will require less force than sliding against the frictional force.

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Answer 2

Answer:

option D ✔

work done in rolling a stone is less than in lifting.

➡️ it is because the friction is directly proportional to the area of contact.......

in rolling, the surface area of contact is very less , therefore, it's easy to roll the stone .

Explanation:

hope it helps ✔✔