Work & Power Flashcard

Front

What is the equation for calculating power?

Back

Power = Work / Time

Front

A girl weighs 400 N. She runs up a flight of stairs of height 5 m in 4 seconds. What is her power?

Back

500 W

Front

Which of these is a measurement of power? 100 joules, 100 watts, 100 meters per second, 100 hertz?

Back

100 watts

Front

True or false: when the distance an object moves is zero the work done on the object is also zero.

Back

True

Front

A kid throws a ball with a force of 70N over 1.1 meters. How much work did he do?

Back

77 joules

Front

Define work in physics.

Back

Work is done when a force causes an object to move in the direction of the force. It is calculated as Work = Force x Distance.

Front

What is the unit of work?

Back

The unit of work is the joule (J).

Front

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

Back

Power is the rate at which work is done, calculated as Power = Work / Time.

Front

If a machine does 200 joules of work in 5 seconds, what is its power output?

Back

40 watts.

Front

What is the formula for calculating work?

Back

Work = Force x Distance.