Work and Power Summative Assessment

Which statement best expresses the definition of power?

• Power is the amount of work done by one person or one machine.

• Power is the percentage of energy which can do work.

• Power is short for horsepower.

• Power is the rate of doing work.

Work is measured in which unit?

• Joules (J)

• Watts (W)

• Newtons (N)

• Meters (m)

Tags

NGSS.MS-PS3-5

A heavy wheelbarrow needs to be moved. You can choose to lift it or use an inclined plane (ramp). The benefit of using the inclined plane is that the work can be done ________________.

• with more friction

• with less force

• with more energy

• with less speed

Tags

NGSS.MS-PS3-5

Your friend uses force to push a heavy cart uphill, but the cart is not moving. Which statement is true?

• A force is being applied, but no work is being done.

• No force is being applied, and no work is being done.

• No force is being applied, but work is being done.

• A force is being applied, and work is being done.

Tags

NGSS.MS-PS2-2

You complete 432 joules of work by applying 16 newtons to a box. How far did you move the box?

• 27 meters

• 16 meters

• 432 meters

• 48 meters

(One word Fill-in-the-blank) When force is applied to a small ping pong ball, the ball moves a certain distance. If the pong ball is switched to a bowling ball, more force is applied to move the object the same distance. This results in increased ________ being done.

• energy

• work

• speed

• power

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

You lift your lunchbox from your backpack and put it on the table. You apply a force of 9 newtons to lift it 1.8 meters in 3 seconds. How much power did you use?

• 5.4 watts

• 6 watts

• 4.8 watts

• 3.6 watts

Tags

NGSS.MS-PS3-5

You and a friend are racing up the stairs. How can you increase your power?

• Take more time to climb the stairs.

• Decrease the force you use.

• Climb the stairs faster.

• Use less energy to climb the stairs.

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

You and your friend race toy cars that are about the same weight. If you both race to the bottom of a ramp, the winner of the race can claim to have demonstrated _______ power.

• less

• more

• equal

• zero

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Which of these things would increase the Power being done?

• Increase the amount of time the work is applied.

• Increase the amount of work over the same time.

• Decrease the amount of work done.

• Use less force to do the work.