Work , Power, and Energy

Front

What is Work?

Back

Work is done when a force causes an object to move in the direction of the force. It is calculated as W = Fd, where W is work, F is force, and d is distance.

Front

What is the formula for calculating Power?

Back

Power is calculated as P = W/t, where P is power, W is work done, and t is the time taken.

Front

What is the unit of Work?

Back

The unit of work is the Joule (J). One Joule is defined as the work done when a force of one newton displaces an object by one meter.

Front

What is the unit of Power?

Back

The unit of power is the Watt (W). One Watt is equal to one Joule per second.

Front

What is the relationship between Work, Power, and Time?

Back

Power is the rate at which work is done. If the same amount of work is done in less time, the power output is greater.

Front

Which of the following is an example of work being done?

Back

Lifting a box is an example of work being done because it involves moving an object against gravity.

Front

If a person does 9000 J of work in 10 seconds, what is their power output?

Back

The power output is 900 watts, calculated using P = W/t.

Front

What happens to power if the same work is done in half the time?

Back

If the same work is done in half the time, the power output doubles.

Front

What is Kinetic Energy?

Back

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

Front

What is Potential Energy?

Back

Potential Energy is the stored energy of an object due to its position or state, commonly gravitational potential energy calculated as PE = mgh, where m is mass, g is acceleration due to gravity, and h is height.