Introduction to Work, Energy and Power

Work is done when the force applied on the object causes it to move in the _______ of the force.

A man holds a stack of boxes. Is he doing any work?

• Yes.

• No.

Answer explanation

Work done = Force x distance moved in the direction of the force

distance moved in the direction of the force = 0m

Thus, no work done.

A man pushes against the wall. Did he do any work?

• Yes.

• No.

Answer explanation

No. The wall did not move.

An object that is moving has ___________ energy.

Any object that is above the ground has ____________ potential energy.

A strectched rubber band has ____________ potential energy.

Batteries, food, fossil fuel all contain ____________ potential energy.

Your mobile phone runs on _________ energy.

A flashlight produces ____________ energy.

Between two objects of simlar dimensions and made from the same material, the object with the higher temperature has more _________ energy.