Work, Power, and Simple Machines

Front

What is Work in physics?

Back

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

Front

What is Power in physics?

Back

Power is the rate at which work is done or energy is transferred. It is measured in Watts.

Front

What is a First Class Lever?

Back

A First Class Lever has the fulcrum positioned between the effort and the load. Example: A seesaw.

Front

What is a Second Class Lever?

Back

A Second Class Lever has the load between the fulcrum and the effort. Example: A wheelbarrow.

Front

What is a Third Class Lever?

Back

A Third Class Lever has the effort between the fulcrum and the load. Example: A fishing rod.

Front

How do you calculate Work?

Back

Work = Force x Distance. If you push with a force of 10 N over a distance of 5 m, Work = 10 N x 5 m = 50 Joules.

Front

What is the formula for calculating Power?

Back

Power = Work / Time. If 100 Joules of work is done in 5 seconds, Power = 100 J / 5 s = 20 Watts.

Front

What is Mechanical Advantage?

Back

Mechanical Advantage is the ratio of the output force to the input force in a machine. It shows how much a machine multiplies force.

Front

What is the unit of Work?

Back

The unit of Work is the Joule (J). 1 Joule is equal to 1 Newton meter.

Front

What is the unit of Power?

Back

The unit of Power is the Watt (W). 1 Watt is equal to 1 Joule per second.