Power

A 5000N block is lifted 10 m. How much work was done?

• 50000 J
• 5000 J
• 500 J
• 50 J

Tags

NGSS.HS-PS3-1

W= 20 Joules
F= .5 Newtons
D=??

• 40 Newtons
• 10 Newtons
• 40 Kilometers
• 10 Kilometers

How much work is produced when 350 N is used to move a car 5 m?

• 70 J
• 1750 J
• 355 J
• 175 J

Sally performed 63J of work as she pushed a refrigerator 3m across the kitchen.  What was the force applied to the refrigerator?
Remember the formula for work!
work = force X distance

• Force = 63 J / 3 m
• Force = 63 J X 3 M
• Force = 3 M X 63 J
• Force = 3 M / 63 J

What is the definition of power?

• the amount of work an object does
• the rate at which force is applied
• the amount of matter in an object
• the rate at which work is done

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

• 0.05 W
• 20 W
• 12500 W
• 2000 W

How much work is done in holding a 15 N sack of potatoes while waiting in line at the grocery store for 3 minutes?

• 15 J
• 45 J
• 0 J
• 5 J

An engine reaches its top speed from rest in 7.5 s. It is able to perform 250,000 J of work in that time.  How much power does this engine have in that time? 

• 0.00003 W
• 33,333 W
• 1,875,000 W
• 1873 W

How much time is needed to produce 720 Joules of work if 90 watts of power is used? 

• 0.125 s
• 8 s
• 64800 s
• 80 s