Work and Power

Front

What is Work?

Back

Work is done when a force acts on an object and the object moves in the direction of the force.

Front

What is Power?

Back

Power is the rate at which work is done.

Front

What are the units of Work?

Back

The units of work are joules (J).

Front

How is Power calculated?

Back

Power is calculated by dividing the work done by the time taken to do that work (Power = Work / Time).

Front

If a weightlifter performs 660.0 J of work in 3.5 s, what is their power?

Back

Power = Work / Time = 660.0 J / 3.5 s = 189 J/s or Watts.

Front

What is the relationship between Work and Power?

Back

Power is the rate at which work is done.

Front

If you push a cart with a force of 60 N for 2 m, how much work have you done?

Back

Work = Force x Distance = 60 N x 2 m = 120 J.

Front

What is the formula for calculating Work?

Back

Work = Force x Distance.

Front

What is Kinetic Energy?

Back

Kinetic energy is the energy an object has due to its motion.

Front

What is the formula for Kinetic Energy?

Back

Kinetic Energy = 1/2 x mass x velocity^2.