Question

5. A block of mass 'm'is pulled by a force 'F' on a level surface through a distance "S
then
The work done on the body against gravitational force is zero
2) The work done on the body against gravitational force is man
ارا ]
3) Ti​

Answer 1

Answer:

From the part of the question given, the correct answer is 1.

Explanation:

Note that the work done by a force F is defined as:

Work done by F = (Magnitude of F) x (Displacement of the body in the direction of F)

The term 'against' is used when a force does negative work, i.e. the body moves in a direction opposite to the applied force.

As you might be aware, gravitational force always acts in the vertical direction.

In the given question, the block is moved on a horizontal surface, thus it has no vertical displacement, i.e. displacement in the direction of force is 0.

Therefore, the work done by the gravitational force = (Magnitude of Force) x (0) = 0 J.

Hence, the correct choice (among the given ones) is 1.

Hope this clears your doubt.

Happy to help!