Name:___KEY_________________Date:____________________Period:_______
WORKsheet
Class Discussion/ Reading: Read pages 74-75 and fill in the blanks.
Formula: Work is equal to the ___force_____ times the ______distance_______
The formula we use to find work is _______W = F x d_________
Unit: ______Newton-meter/joules_____ is the unit of work.
Is work being done?
1. A teacher applies a force to a wall and becomes exhausted.
2.
A book falls off a table and free falls to the ground.
3. A waiter carries a tray full of meals above his head by one
arm across the room. (CAREFUL! This is very tricky!)
Force needs to be in the same direction as the motion
4. A rocket accelerates through space.
Yes/No
No
Yes
No
Yes
Now, work these problems:
5. A 100 N force is applied to move a 15 kg. object a horizontal distance of 5 m at a
constant speed. What is the work done on this object?
W = Fd
W = (100 N) (5 m)
F = 100 N
W = 500 N-m
D=5m
F=100N
15
kg
6. An upward force is applied to lift a 15 kg object to a height of 5 m at a constant
speed. What is the work done on this object? (Careful…this is tricky…)
F
W = Fd
F = ma  (15 kg) (9.8 m/s2) = 147 N
D=5m
W = Fd  (147 N) (5m) = 735 N-m
15
kg
7. How much work is done by an applied force to life a 15 N block 3.0 m vertically
at a constant speed?
W = Fd  (15 N) (3 m) = 45 N-m
F = 15 N
D=3m
Name:___KEY_________________Date:____________________Period:_______
8. A ball with a weight of 30 N is kicked 2 m into the air. What work as been done?
W = Fd, F = 30 N, d = 2 m  (30 N) (2 m) = 60 N-m
9. A weightlifter lifts 2 weights of 200 N each up to a height of 1 m. What work has
he done?
W = Fd, F = 200 N, d = 1 m  (200 N) (1 m) = 200 N-m x 2 weights = 400 N-m
10. A furniture mover lifts a box weighting 500 N into the back of a truck which is
1.5 m above the ground. How much work has he done?
W = Fd
W = (500 N) (1.5 m) = 750 N-m
F = 500 N
D = 1.5 m
11. A 60 kg athlete runs up a 3 m flight of stair what work has she done? (g=9.8 m/s2)
W = Fd
W = (588 N) (3 m) = 1764 N-m
2
F = ma = (60 kg) (9.8 m/s ) = 588 N
D=3m
12. A student with a mass of 80.0 kg runs up three flights of stairs in 12.0 sec. The
student has gone a vertical distance of 8.0m. Determine the amount of work done
by the student to elevate her body to this height. Assume that her speed is
constant.
W = Fd
W = (784 N) (8m) = 6272 N-m
F = ma = (80 kg) (9.8 m/s2) = 784 N
D=8m
13. Ben Travlin carries a 200 N suitcase up three flights of stairs (a height of 10.0m)
and then pushes it with a horizontal force of 50.0 N at a constant speed of 0.5 m/s
for a horizontal distance of 35.0 m. How much work does Ben do on his suitcase
during this entire motion?
Vertical
W = Fd
F = 200 N
D = 10 m
W = (200 N) (10 m)
W = 2000 N-m
Horizontal
W = Fd
F = 50 N
D = 35 m
W = (50 N) (35m)
W = 1750 N-m
Total Work = Vertical + Horizontal  2000 N-m + 1750 N-m = 3750 N-m
14. A squirrel (mass of 1 kg) does push-ups by applying a force to elevate its center
of mass by 5 cm. Determine the number of push-ups it must do in order to do
5.0 J of work.
W = Fd
W = (9.8 N) (0.05 m)
F = ma = (1 kg) (9.8m/s2) = 9.8 N
W = 0.49 N-m
d = 5 cm = 0.05 m
5 N-m / 0.49 N-m = 10 push ups