I. Work
A. Sample Problems:
1. Formula: W = F * d
Substitution: W = 200 N * 50 m
Answer with unit of measure: 10,000 Joules
2. Formula: d = W / F
Substitution: d = 75 J / 5 N
Answer with unit of measure: 15 meters
3. Formula: F = W / d
Substitution: F = 125 J / 10 m
Answer with unit of measure: 12.5 Newtons
4. F = W / d = 150 J / 10 m = 15 Newtons
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:
4. W = F * d = 90 N * 5 m = 450 Joules
5. d = W / F = 72 J / 6 N = 12 meters
6. F = W / d = 120 J / 24 m = 5 Newtons
7. W = F * d = 62.6 N * 13 m = 813.8 Joules
8. d = W / F = 13.2 J / 2 N = 6.6 meters
9. F = W / d = 136 J / 27.2 m = 5 Newtons
10. F = W / d = 360 J / 4 m = 90 Newtons
11. W = F * d = 1000 N * 20 m = 20,000 Joules
12. d = W / F = 68 J / 4 N = 17 meters
13. No work is done (0 Joules) because there is no displacement while holding the sack.
Parent Tip: Review the logic above to help your child master the concept of calculating work and power worksheet.