Work questions
Task
Use the equation to answer the questions.
𝑤𝑜𝑟𝑘 𝑑𝑜𝑛𝑒 (𝑗𝑜𝑢𝑙𝑒𝑠, 𝐽) = 𝑓𝑜𝑟𝑐𝑒(𝑛𝑒𝑤𝑡𝑜𝑛𝑠, 𝑁) × 𝑑𝑖𝑠𝑡𝑎𝑛𝑐𝑒 (𝑚𝑒𝑡𝑟𝑒𝑠, 𝑚)
1. How much work is done lifting things onto a shelf …
a. a book with a force of 10 newtons up 1 metre? ..........................................
b. a box with a force of 25 newtons up 2 metres? ...........................................
c. a box with a force of 12.4 N up 1.50 m? ....................................................
d. 5 boxes each with a force of 14.4 N up 2.2 m? ............................................
2. How much work is done pushing …
a. a car 5 metres with a force or 200 newtons? ..............................................
b. a motorbike 15 metres with a force of 80 newtons? ......................................
c. a van 20 m with a force of 400 N? ...........................................................
d. a car 19.4 m by 3 people each with a force of 50 N? .....................................
3. How much work is done climbing …
a. 2 metres with a force of 500 newtons? .....................................................
b. 4 metres with a force of 550 newtons? .....................................................
c. a mountain 1000 m tall with a force of 600 N? ............................................
d. a hill 0.3 km tall with an average force of 45 N? ..........................................
e. 20 steps, each 20 cm high with a force of 760 N? .........................................
4. How much work is done raising an elevator …
a. up one 3 metre floor with a force of .......................................................
b. up 5 floors with the same force? ............................................................
c. which is full up 12 floors with a force of 21 kN? ..........................................
5. How much work is done cycling …
a. 500 metres against friction forces of 20 N? ................................................
b. 2 km with an average force of 32N? 64 kJ .................................................
c. 6.8 km on a windy day with a force of 54 N? ..............................................
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Work questions
Answers
1.
a. 10 joules
b. 50 joules
c. 18.6 J
d. 158.4 J
2.
a. 1 000 joules
b. 120 joules
c. 8 kJ (8 000 J)
d. 2.91 kJ (2 910 J)
3.
a. 1 kilojoule (1 000 joules)
b. 2.2 kilojoules (2 200 joules)
c. 600 kJ
d. 135 J
e. 3 040 J
4.
a. 9 kJ (9 000 joules)
b. 45 kJ (45 000 J)
c. 756 kJ (756 000 J)
5.
a. 1 kJ (1000 joules)
b. 64 kJ (64 000 J)
c. 367.2 kJ (367 200 J)
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25677
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