WorksheetsWork and Power Practice
Total questions: 28
Worksheet time: 56mins
Work is done ___________
only when force is applied
on an object
cause the object to move
into the opposite direction
as applied force.
only when force is applied
on an object
cause the object to move
into the same direction
as applied force.
Formula of work:
W = F x t
W = F + t
W = F / d
W = F x d
Units of work is ___________
Newton (N)
watt (w)
joule (J)
Power is ___________
Is the rate of energy transfer.
Speed of doing work is work done in a certain time.
both
none
Power =
Work + time
Work / time
Work x time
A set of pulleys is used to lift a piano weighing 1,000 newtons. The piano lifted 3 meters in 60 seconds How much power is used? (Hint: Solve for work first. This is a 2-step problem)
16.67 watts
50 watts
How much power is used if a force of 35 newtons is used to push a box a distance of 10 meters in 5 seconds? (Hint: Solve for work first. This is a 2-step problem)
70 watts
1750 watts
A monkey weighing 50 N climbed a height of 3 m up a tree in 20 s.
Calculate power needed by the monkey (Hint: Solve for work first. This is a 2-step problem)
7.5 W
750 W
150 J
1500 J
How much power is used if a force of 35 Newtons is used to push a box a distance of 10 meters in five seconds? (Hint: Solve for work first. This is a 2-step problem.)
70 W
3.5 W
7 W
350 J
A deflated hot-air balloon weighs a total of 8000 N. Filled with hot air, the balloon rises to a height of 1000 m. How much work is accomplished by the hot air?
8,000,000 J
8 J
800 J
8,000 J
A bird lifts a worm with a weight of 0.5N up to her nest, 1.5m off the ground. It takes her 3 seconds. How much work did the bird do?
0.75 J
0.33 J
25 J
3 J
A bird lifts a worm with a weight of 0.5N up to her nest, 1.5m off the ground. It takes her 3 seconds. How much power did the bird do? (Remember the work done from the last question)
0.25 W
2.25 W
2W
0.002 W
A man spends 100 seconds pushing a cart 250 meters, using a force of 80N. How much work did he do?
20,000 J
800 J
3.125 J
A man spends 100 seconds pushing a cart 250 meters, using a force of 80N. How much power did he produce? Remember the work done from the last question
200 W
20 W
2 W
2,000 W
A weightlifter lifts 500N through a distance of 2 meters in 3 seconds. How much work did he do?
1,000 J
250 J
1,500 J
A weightlifter lifts 500N through a distance of 2 meters in 3 seconds. How much power did he produce? Remember the work from the last question
333.33 W
33.33 W
3,000 W
3 W
A 50N girl climbs the flight of stairs in 3 seconds. How much work did she do?
150 J
16.6 J
20 J
A 50N girl climbs the flight of stairs in 3 seconds. What was her power? Remember the work from the last question
50 W
450 W
3 W
The girl lifts the painting to a height of 0.5m in 0.75 seconds. How much work did she do?
30 J
300 J
120 J
The girl lifts the painting to a height of 0.5m in 0.75 seconds. What was her power? Remember the work from the last question
40 W
3000 W
150 W
It took 800 J of work to move a box 40 meters. What is the weight of the box in N?
20 N
25 N
32,000 N
320 N
