Power

Work divided by time equals...

• energy

• power

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 an 8-newton weight 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?

• mass of 10 kilograms lifted 10 meters in 10 seconds 

• mass of 10 kilograms lifted 10 meters in 5 seconds

• mass of 5 kilograms lifted 10 meters in 5 seconds

• mass of 5 kilograms lifted 5 meters in 10 seconds

Tags

NGSS.MS-PS3-4

You move a 12-newton box up a 6-meter ramp. In order to find out how much power you created, what would you need to know?

• The mass of the box

• The slope of the ramp 

• The direction the box moved

• How long the task took

The unit of power is the...

• work

• watt

Power is the RATE at which work is done. 

• True

• False

The SI Unit for Power

• Newton (N)

• Joule (J)

• Second (s)

• Watt (W)

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

• 30 watts

• 3 watts

• 120 watts

• 270 watts

While rowing across the lake during a race, John does 3960 J of work on the oars in 60 seconds. What is his power output?

• 56W

• 100W

• 66W

• None of the answers are correct