Work and Power Problems

Front

What is the formula for work?

Back

Work = force x distance

Front

How much work is done when a 300 N weight is lifted 1.5 meters?

Back

900 J

Front

What is the equation for power?

Back

power = work / time

Front

How much work is done when an 8 N force moves a block 7m?

Back

56 J

Front

Which scenario produces the most power? A mass of 10 kg lifted 10 m in 10 s, A mass of 10 kg lifted 10 m in 5 s, A mass of 5 kg lifted 10 m in 5 s, A mass of 5 kg lifted 5 m in 10 s?

Back

A mass of 10 kg lifted 10 m in 5 s

Front

Define work in physics.

Back

Work is done when a force causes an object to move in the direction of the force.

Front

What units are used to measure work?

Back

Joules (J)

Front

What is the relationship between work and energy?

Back

Work is a transfer of energy; when work is done, energy is transferred to or from an object.

Front

How is power defined in physics?

Back

Power is the rate at which work is done or energy is transferred.

Front

What are the units of power?

Back

Watts (W), where 1 W = 1 J/s.