Work, Energy, Power

Which of the following is the best example of work being done:

• doing homework

• lifting a box

• pushing a stationary box

• holding a box

At which point is kinetic energy greatest? 

• W

• X

• Y

• Z

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-4

NGSS.MS-PS3-5

What position has the least amount of potential energy?

• W

• X

• Y

• Z

Tags

NGSS.MS-PS3-2

At which point(s) on the roller coaster is the kinetic energy at its maximum?

• A

• B

• C

• D

Tags

NGSS.MS-PS3-1

If a student uses 10 Newtons of Force to push a chair 5 meters, how much is work is being done?

• 2 Joules

• 0.5 Joules

• 50 Joules

• 20 Newtons

Tags

NGSS.MS-PS2-2

To complete a project 200,000 Joules of work are needed. The time taken to complete the project is 20 seconds. What number goes with w?

• w=20 seconds

• w=10 Watts

• w=200,000 Joules

• w=10,000 Joules

What is power?

• transfer a force through a distance

• the rate of speed 

• the rate of work being done

• transfer of space over time

Tags

NGSS.MS-PS3-5

Think back to the stair lab. Did the amount of work you did change? How did you increase your power going up the stairs?

• Yes, the amount of work changed because the force increased.

• No, the amount of work did not change because the force (weight) and distance remained the same.

• Yes, the amount of work changed because the distance increased.

• No, the amount of work did not change because the distance decreased.

Answer explanation

No, the amount of work did not change because the force (weight) and distance remained the same.

Work is measured in which unit?

• Kilogram

• Joule

• Newton

• Watt

To complete a project 200,000 Joules of work are needed. The time taken to coplete the project is 20 seconds. What number goes with w?

• w=20 seconds

• w=10 Watts

• w=200,000 Joules

• w=10,000 Joules

Tags

NGSS.MS-PS3-5