Energy, Work and Power

A 100 N force is applied to move an object a horizontal distance of 5 meters at constant speed in 10 seconds. How much power is done? (pay attention - you have to find work before you find the power)

• 50J

• 50W

• 500J

• 500W

Tags

NGSS.MS-PS3-5

the rate at which energy is transferred.

• energy

• power

• work

Energy is the ability to do work or cause...

• events

• change

• friction

• explosions

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

The equation for WORK is

• work = power x mass

• work = power / time

• work = force x distance

• work = distance x time

The equation for POWER is

• power = mass x time

• power = work / time

• power = time / work

• power = work x time

________________ is the rate at which work is done.

• Power

• Work

• Time

• Energy

The unit of power

• Joule

• Minute

• Watt

• Pound

Which statement does not illustrate power?

• A farmer plowing the rice field all day.

• A Siberian husky pulling a sled all day.

• A principal sitting on a chair while observing several classes all day.

• Jack and Jill running up and down the hill all day.

Which statement illustrates work done?

• A weightlifter holds a barbell above her head.

• A teacher applies a force to a wall and becomes exhausted.

• A rolling marble hits a note card and moves it across a table.

• A waiter carries a tray full of meals across a dining room at a constant speed.

Tags

NGSS.MS-PS3-5

A construction worker pushes a wheelbarrow 10 m with a horizontal force of 5 N. How much work is done by the worker on the wheelbarrow?

• 5 J

• 15 J

• 2 J

• 50 J