Chapter 4 Work Power and Energy Test

The use of a force to move an object some distance is called

• mass

• work

• power

• time

If it takes 500 Joules to move an object in 10 seconds, what is the power output?

• 50 N

• 5,000 N

• 5,000 W

• 50 W

The basic metric system unit of power is the

• Joule

• Newton

• Meter

• Watt

What do we call the rate at which work is done?

• Efficiency

• Work Input

• Work output

• Power

If a person weighing 400 N takes 6 seconds to walk up a staircase that is 3 meters high, what is his power output?

• 200 W

• 1200 W

• 6000 W

• 7200 W

Which of these does not represent work done on a rock in the scientific sense?

• lifting a rock

• throwing a rock

• holding a rock

• dropping a rock

A simple machine is

• a tool that makes work easier

• a tool with many moving parts

• a force of attraction

• the measurement from top to bottom of an object

In which of these situations is NO work done?

• holding a box two fee off the floor

• pushing a box across the floor

• carrying a box across the room

• carrying a box upstairs

If the velocity of a moving object is doubled, the object's kinetic energy is

• unchanged

• halved

• doubled

• quadrupled

How much power is necessary to do 50 joules of work in 5 seconds?

• 5 watts

• 10 watts

• 50 watts

• 250 watts