Work and Power Review

Front

What is the definition of work?

Back

Work is defined as force times distance (W = F × d).

Front

How much work is done on a 40 N crate that you lift 3 meters?

Back

120 J (Work = Force × Distance = 40 N × 3 m).

Front

What is the unit of power?

Back

The unit of power is the watt (W).

Front

What is the relationship between work and power?

Back

Power is the amount of work done in a certain amount of time (P = W/t).

Front

If you do 40 Joules of work in 8 seconds, how much power did you exert?

Back

5 watts (Power = Work/Time = 40 J / 8 s).

Front

What is the formula for calculating work?

Back

Work = Force × Distance (W = F × d).

Front

What is the formula for calculating power?

Back

Power = Work / Time (P = W/t).

Front

What is the relationship between joules and watts?

Back

1 watt is equal to 1 joule per second (1 W = 1 J/s).

Front

What is an example of work being done?

Back

Lifting a box off the ground is an example of work being done.

Front

What is an example of no work being done?

Back

Carrying a bag while walking at a constant speed without lifting it higher is an example of no work being done.