Work, Works

Which situation is work not done?

• lifting a 2 kg box off the floor

• holding a 2 kg box above the floor

• sliding a 2 kg box across the floor

• sliding a 2 kg box up an inclined plane

What is work?

• A push or pull.
• When the object moves in the same direction in which the force is exerted.
• A change in energy.
• The rate at which energy is transferred.

Which is doing work?

• pushing a wall
• holding a box
• picking up a pencil
• sitting in a chair

Which of the following is the best example of work being done? 

• doing homework
• lifting a box
• pushing a stationary box
• holding a box

An example of work is holding a heavy bag.

• True
• false

You do work only when you exert a force on an object and move it.

• True
• False

A girl pushes a box across the floor. Did she do work?

• No.
• Yes.

True or false

You do work when you pose like a statue with an object in your hand.

• true

• false

Is this an example of work?

• Yes

• No

Is this an example of work?

• Yes

• No!