Energy, Work and Power

A weightlifter lifts two 300 newton weights 1.5 meters off the ground. How much work has he done?

• 600 J 

• 660 J

• 900 J 

• 1200 J 

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

You do 90 joules of work in 30 seconds. How much power have you generated?

• 30 watts

• 3 watts

• 120 watts

• 270 watts

You move a 0.8 kg object five meters in 4 seconds. How much power have you generated?

• 160 watts

• 10 watts

• 6.4 watts

• 17 watts

Which of the following would produce the most power?

• A mass of 10 kilograms lifted 10 meters in 10 seconds 

• A mass of 10 kilograms lifted 10 meters in 5 seconds

• A mass of 5 kilograms lifted 10 meters in 5 seconds

• A mass of 5 kilograms lifted 5 meters in 10 seconds

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

A 5000N block is lifted 10 m. Calculate the work done.

• 50000 J

• 5000 J

• 500 J

• 50 J

Tags

NGSS.MS-PS3-2

How much work is produced when 350 N is used to move a car 5 m (W=Fd)?

• 70 J

• 1750 J

• 355 J

• 175 J

What are the units for the power formula:

power=work/time

• W=s/J

• J=W/s

• J=s/W

• W=J/s

The rate (how fast) at which work is being done.

• Power

• Joules

• Work

• Newton

• No choice is correct

If 150 Joules of work is needed to move a box 10 meters, what force was used? 

• 1500 N

• 15 N

• 1.5 N

• 150 N

Tags

NGSS.MS-PS2-2

The units for power.

• Watts

• Power

• Joules

• Work

• No choice is correct