Work, Power, and Simple Machines

The unit used to measure power is the:

• Watt (W)
• Joule (J)
• Newton (N)

The unit used to measure work is the:

• Newton (N)
• Joule (J)
• Meter (m)
• Watt (W)

Work is being done when you:

• apply a force to an object
• do not apply a force to an object
• Exert a force that causes an object to move in the direction of the force

Power is defined as:

• how strong someone or something is
• the rate (how fast) work is done
• how much work you do

In which situation is work being done?

• You study your notes for 2 hours
• You kick a soccer ball into the field
• You push a heavy object that does not move

Tim and Ann are both lifting identical bags of groceries, but Ann lifts them twice as fast. This example involves twice as much:

• work
• time
• power

Which of the following is NOT an example of work according to the science definition of work?

• studying notecards for 2 hours
• hitting a baseball into the outfield
• lifting a sign in the air

In a basketball game, which example is NOT considered to be work done on an object?

• dribbling a ball
• slam dunking the ball
• running without the ball

Which of the following is NOT considered to be a simple machine?

• lever
• screw
• calculator

A ramp is what type of simple machine?

• wedge
• wheel and axle
• inclined plane