Energy, Work, and Power Review

Front

What is Power?

Back

Power is defined as the rate at which work is done or energy is transferred. It is calculated as Work done divided by time.

Front

How is Power calculated?

Back

Power (P) = Work (W) / Time (t) where Work is measured in Joules and Time in seconds.

Front

What is Work?

Back

Work is done when a force causes an object to move. It is calculated as Work = Force x Distance.

Front

How much work is done when lifting a 40 N crate 3 meters?

Back

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

Front

What is Potential Energy?

Back

Potential Energy is the energy stored in an object due to its position or height. It is calculated as PE = mgh (mass x gravity x height).

Front

What is Kinetic Energy?

Back

Kinetic Energy is the energy of an object in motion, calculated as KE = 1/2 mv² (1/2 x mass x velocity squared).

Front

What is the relationship between Work and Energy?

Back

Work is a transfer of energy. When work is done on an object, energy is transferred to that object.

Front

If you lift a 200 N crate 2 meters in 5 seconds, how much power is expended?

Back

80 W (Power = Work / Time = 400 J / 5 s).

Front

What is the unit of Power?

Back

The unit of Power is the Watt (W), which is equivalent to one Joule per second.

Front

What is the difference between Work and Power?

Back

Work is the total energy transferred, while Power is the rate at which that work is done.