Work Energy and Power

When you do work on an object, some of your energy is ____ to that object.

Tags

NGSS.MS-PS3-5

The equation for POWER is

• power = mass x time

• power = work / time

• power = time / work

• power = work x time

Tags

NGSS.MS-PS3-5

________________ is the rate at which work is done.

• Power

• Work

• Time

• Energy

The unit of power

• Joule

• Minute

• Watt

• Pound

Energy cannot be ________ or ___________.

• big/small

• left/right

• created/destroyed

• made/transferred

Tags

NGSS.MS-PS3-5

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.

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

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.

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

Bob (80 kg) uses 180 N of force to get him up the slope. The vertical distance is 2 m and the diagonal is 10 m. Calculate the work he does.

• 1600 J

• 160 J

• 3600 J

• 1800 J

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2