What is the work done against gravity when a body is moved horizontally along a frictionless surface?

Give reason for the following :

Pardeep says that the acceleration in an object could be zero even when several forces are acting on it. Do you agree with him? Why?

Which of the following does not possess the ability to do work not because of motion?

A. A sparrow flying in the sky

B. A sparrow moving slowly on the ground

C. A sparrow in the nest on a tree

D. A squirrel going up a tree

Each of the following statement describes a force - acting. Which force is causing work to be done?

A. The weight of a book at rest on a table

B. The pull of a moving railway engine on its coaches

C. The tension in an elastic band wrapped around a parcel

D. The push of a person’s feet when standing on the floor

What should be the angle between the direction of force and the direction of motion of a body so that the work done is zero?

In case of negative work, the angle between the force and displacement is:

A. 0^o B. 45^o

C. 90^o D. 180^o

When do we say that work is done? Write the formula for the work done by a body in moving up against gravity. Give the meaning of each symbol which occurs in it.

Is it possible that a force is acting on a body but still work done is zero? Explain giving one example.

When a force retards the motion of a body, the work done is :