Question

While dragging or lifting an object negative work is done by...
a. The applied force
b.gravitational force
c.frictional force
d.reaction force

Answer 1

the answer is frictional
force

Answer 2

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Here is the required answer : -
While dragging an object negative work is done by:
Frictional force

While lifting an object negative work is done by:
Gravitational force

At both cases negative work is surely done but the negative work is done by different forces.

Frictional force is the force which acts when a body moves. This force can be reduced by applying grease, oil, etc. to the substances.

Gravitational force is the force of Earth which attracts all objects towards the centre of Earth. This acceleration of this force is different at different places on Earth. This acceleration of gravitational force is called acceleration due to gravity and is denoted by small g (g).

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