W= 500 Joules Formula: _________________________________
t = 25 seconds Substitution: ______________________________
P = ? Answer with unit of measure: _________________
Answers
1. F = 200 Newtons Formula: W = Fd
d = 50 meters Substitution: W = (200 N)(50 m)
W = ? Answer with unit of measure: W = 10,000 J
2. F = 5 Newtons Formula: d = W/F
W = 75 Joules Substitution: d = 75 J/5 N
d = ? Answer with unit of measure: d = 15 m
3. W = 125 Joules Formula: F = W/d
d = 10 meters Substitution: F = 125 J/10 m
F = ? Answer with unit of measure: F = 12.5 N
If 150 Joules of work is needed to move a box 10 meters, what force was used?
W = 150 J F = W/d F = 15 N
d = 10 m F = 150 J/10 m
B. Fill-in-the-blank:
1. Work is done when an object moves through a distance because of a force acting upon the object.
2. When calculating work, you should use the formula: work = force X distance.
3. The SI unit for work is the Joule. It is represented by the letter J.
C. Work Problems:
F = 90 N W=Fd 5. F = 6 N d=W/F 6. W = 120 J F=W/d
d = 5 m 90(5) W = 72 J 72/6 d = 24 m 120/24
W = ? 450 J d = ? 12 m F = ? 5 N
W = ? W = Fd 8. W = 13.2 J d = W/F 9. W = 136 J F = W/d
F = 62.6 N 62.6(13) F = 2 N 13.2/2 d = 27.2 m 136/27.2
d = 13 m 813.8 J d = ? 6.6 m F = ? 5 N
10. If 360 Joules of work are needed to move a crate a distance of 4 meters, what is the weight of the
crate? W = 360 J F = W/d F = 90 N
d = 4 m F = 360 J/4 m