work and power

The unit used to measure work is the 

• Watt
• Newton
• Joule
• meter

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

• doing homework

• lifting a box

• pushing a stationary box

• holding a box

In which of these cases is work being done? 

• A student sleeps
• A student pushes a locked door that does not move
• a student carries his chair into another room
• A student sits on the carpet

If 68 Joules were necessary to move a 4 Newton crate, how far was the crate moved?

• 272 m
• 17 m
• 4.05 m
• 272 cm 

What is the equation for power?

• P = Work/time
• P = Force/time
• P = time/distance
• P = Work * time

What is the equation for work?

• W = mass * acceleration
• W = force * distance
• W = force/distance
• W = speed/time

The unit used to measure power is the 

• Watt
• Newton
• Joule
• Newton*meter

Power is defined as the quantity that measures the rate at which _____ is done or energy is transformed.

• energy
• time
• work
• elasticity

You push against the back of your friends car that is stuck. You push and be become very tired. Did you do work?

• Yes, work was done
• No, work wasn't done

Work requires force and _______.

• distance
• time
• position