WORK QUESTIONS
- A tugboat pulls a ship with a constant force of 5000 N, causing the ship to move through a harbor. How much work does the tugboat do on the ship if each moves a distance of 3 km?
Answer: 3km = 3000 m
W = F x D
W = 5000 x 3000
W = 15,000,000
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2. A husky dog does 20 kJ of work as he pulls a sleigh with a force of Through what distance does he pull it?
Answer: 20kJ = 2000 J
W = F x D
2000 J = 340 x D
D = 2000 J / 340
D = 58.85
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3. What is the weight of a mass of 100 kg? Find the work done in raising a mass of 100 kg through a vertical height of 60 m.
Answer: mass = 100 kg
Force Gravity = Mass x Gravity
= 100 x 10
= 1000 N
W: F x D
W: 1000N x 60m
W: 1000N x 60m
W: 60000J
W: 60kJ
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4. Carlos does a chin-up in gym class and raises himself 0.8 m. If Carlos has a mass of 62 kg, how much work does he accomplish?
Force Gravity = Mass x Gravity
= 62 x 10
= 620 N
W: F x D
W: 620N x 0.8m
W: 496J
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5. A girl pushes her little brother on his sled with a force of 300 N for 750. m. How much work is this if the force of friction acting on the sled is
(a) 200 N
Answer:
(a).
W: F x D
W: (300-200)N x D
W: 100N x 750m
W: 75000J
W: 75kJ
W: (300-200)N x D
W: 100N x 750m
W: 75000J
W: 75kJ
(b).
W: F x D
W: (300-300)N x D
W: 0N x 750m
W: 0J
W: (300-300)N x D
W: 0N x 750m
W: 0J
her little brother wont move
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