Physics Review: Work Energy Power Test

Front

What is Gravitational Potential Energy?

Back

The energy an object possesses due to its position in a gravitational field, calculated as PE = mgh, where m is mass, g is acceleration due to gravity, and h is height.

Front

Calculate the Gravitational Potential Energy of a 700 g box at 5 m height.

Back

34.3 J (PE = mgh = 0.7 kg * 9.8 m/s² * 5 m).

Front

What is Power in physics?

Back

The rate at which work is done or energy is transferred, measured in watts (W).

Front

If an engine generates 1200 W of power, how long does it take to do 24000 J of work?

Back

20 seconds (Power = Work/Time, Time = Work/Power = 24000 J / 1200 W).

Front

Define Kinetic Energy.

Back

The energy an object possesses due to its motion, calculated as KE = 1/2 mv², where m is mass and v is velocity.

Front

What is the formula for calculating work done?

Back

Work = Force x Distance (W = Fd).

Front

A car engine exerts a force of 150 N and does 45000 J of work. What is the distance moved?

Back

300 meters (Work = Force x Distance, Distance = Work/Force = 45000 J / 150 N).

Front

What is the unit of energy?

Back

Joule (J).

Front

If a 3.5 kg object has a gravitational potential energy of 2800 J, what is its height?

Back

80 m (PE = mgh, h = PE/(mg) = 2800 J / (3.5 kg * 9.8 m/s²)).

Front

What is the relationship between work, energy, and power?

Back

Work is the transfer of energy, and power is the rate at which work is done.