Power Work Force Problems

How much work is done when a 45 N force moves a block 20m?

• 900 J

• 2.25 J

• 900 m

• 2.25 W

Eva applies 40 N force to move her bookcase 3 m, how much work did Eva do?

• 120 J

• 13.3 J

• 13.3 W

• 3 m

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

• 30 watts

• 3 watts

• 120 watts

• 270 watts

A horse performs 15,000 joules of work pulling a wagon for 20 seconds. What is the horse's power?

• 750 W

• 300 W

• 2.25 J

If it takes 50 seconds and 10 Joules move some books, calculate how much power is required to complete this task.

• 5 J

• 0.2 W

• 5 W

Tags

NGSS.MS-PS3-5

The SI Unit for Power

• Newton (N)

• Joule (J)

• Second (s)

• Watt (W)

What is the formula for Power?

• E=mc²

• W= F x d

• P = W/t

What is the formula for Work?

• E=mc²

• W= F x d

• P = W/t

Tags

NGSS.MS-PS3-5

W = 500 Joules 
t = 25 seconds
P = ???

• 0.05 W

• 20 W

• 12500 W

• 2000 W

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