Font size
WorksheetsWork and Power
Total questions: 26
Worksheet time: 13mins
Define Work
A force applied to an object, causing it to move
Applying a force to an object, that may or may not move
An object that does not move, but has force applied to it
An object with no forces acting on it
What are the variables for work?
F (force)
t (time)
d (distance)
a (acceleration)
For work to be done, force must be applied in the __________ direction.
Same
Opposite
Perpendicular
Tangent
What example(s) below shows work being done?
A pickup truck moving 25 boxes from one house to another
A painter carrying a paint can up a ladder
A car revving its engine at a stop light
A bird sitting on a sign
What example(s) below shows no work being done?
A pickup truck moving 25 boxes from one house to another
A painter carrying a paint can up a ladder
A car revving its engine at a stop light
A bird sitting on a sign
A boy helps a teacher by lifting a 200-N box of books 1.5 meters from the floor to the desktop.
300 J
75 J
0 J
300 N
A boy helps a teacher by lifting a 500-N box of books 1.5 meters from the floor to the desktop.
750 W
750 J
125 J
0 W
A girl throws a 1-kg softball with a force of 50 Newtons a distance of 25 meters.
1250 J
1250 W
50 J
25 J
A girl throws a 1-kg softball with a force of 50 Newtons a distance of 17 meters.
850 J
850 W
50 J
25 J
How are Work and Power related?
Work and Power both have force as a variable
Work and Power are not related
Work and Power both have time as a variable
Work and power both have speed as a variable
Define Power
The rate at which work is done.
The distance an object travels when a force is applied
The rate at which an objects velocity changes
The amount of matter an object has.
A woman pushes a cart with 95 N of force 3 m in 10 seconds.
9.5 W
28.5 J
28.5 W
30 W
A man pushes a cart with 95 N of force 3 m in 13 seconds.
7.3 W
21.9 W
21.9 J
39 W
Explain why work is or is not done:
A woman preparing for a trip lifts her suitcase from the floor to the bed so that she may pack more easily.
Work was done, because she lifted the suitcase
Work was not done, because she lifted the suitcase
Work was done because she left her room for the trip
Work was not done because she did not leave the room
Explain why work is or is not done:
A man spends 5 minutes thinking about the most efficient way to decorate his roof with Christmas lights.
Work was not done because the man stood still
Work was not done, because he is going to move when he decorates his roof
Work was done because he thought about the work
CHRISTMAS!
Explain why work is or is not done:
A student carries his book bag down the hallway.
Work was done because the student is walking down the hallway
Work was not done, because the bag is already on his back
Work was done because he is alive
Work is not done because he is carrying down the hallway, and not up
A 340-N student climbs the stairs in 14 seconds.
24.3 J
24.3 W
4760 J
4760 W
A 420-N student climbs the stairs in 14 seconds.
30 J
30 W
12,600 J
12,600 W
Which of the following scenarios used more power?
A: 420-N student climbs the stairs in 14 seconds.
B: 340-N student climbs the stairs in 14 seconds.
A, because there is more force in the same time
B because there is less force in the same time
A, because A did the work faster
B, because B did the work slower
If 360 Joules of work are needed to move a crate a distance of 4 meters, what is the weight of the crate?
90 N
90 Watts
360 N
4 N
If a group of workers can apply a force of 1000 Newtons to move a crate 20 meters, what amount of work will they have accomplished?
20,000 J
50 J
20,000 W
50,000 J
If 68 Joules of work were necessary to move a 4 Newton crate, how far was the crate moved?
17 m
17 J
17 W
272 m
A person weighing 600 N gets on an elevator. The elevator lifts the person 6 m in 10 seconds. How much power was used?
360 W
360 J
3600 J
10 W
How much time is needed to produce 720 Joules of work if 90 watts of power is used?
8 m
80 m
630 W
8 J
If 68 W of power is produced in 18 seconds, how much work is done?
1224 J
1224 W
3.8 J
0 J
A set of pulleys lifts an 800 N crate 4 meters in 7 seconds. What power was used?
457.1 W
1400 W
457.1 J
22,400 W
