Review: Work and Power

A force of 8 Newton pushes a 2 kilogram object across a level floor for 10 meters in 3 seconds.

How much work is done?

• 160 J

• 80 J

• 27 J

• 5.3 J

Tags

NGSS.MS-PS2-2

A force of 2 Newton pushes a 2 kilogram object across a level floor for 2 meters in 2 seconds.

How much work is done?

• 16 J

• 8 J

• 4 J

• 2 J

A force of 8000 Newton pushes a 50 kilogram object across a level floor for 100 meters in 300 seconds.

How much work is done?

• 800,000 J

• 400,000 J

• 16,666.67 J

• 13.3334 J

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

100 J of work is done on a 60 kg object over a distance of 19 m in 23 seconds .

What is the power done on the object?

• 1.7 sec

• 4.3 sec

• 1.3 sec

• 1.5 sec

10,000 J of work is done on a 45 kg object over a distance of 20 m in 120 seconds .

What is the power done on the object?

• 222.2 W

• 83.3 W

• 500 W

• 375 W

How long does it take a an object with a force of 10 N to achieve a power of 40 W?

• 4 min

• 400 sec

• 0.25 sec

• 4 sec

Identical twins run up a flight of stairs. Jake takes 20 seconds, and Jordan takes 1/4 of a minute. Who did more work?

• equal work

• Jake

• Jordan

Identical twins run up a flight of stairs. Jake takes 20 seconds, and Jordan takes 1/4 of a minute. Who had more power?

• equal power

• Jake

• Jordan

A 20,000 kg truck is speeding up at 5 m/s^2. It takes a distance of 50 meters to stop, and takes 20 seconds.

How much work did the truck do?

• 100,000 J

• 250,000 J

• 1,000,000 J

• 5,000,000 J

Tags

NGSS.HS-PS2-1

NGSS.HS-PS3-1

A 20,000 kg truck is speeding up at 5 m/s^2. It takes a distance of 50 meters to stop, and takes 20 seconds.

How much power did the truck use?

• 100,000 W

• 250,000 W

• 1,000,000 W

• 5,000,000 W

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5