1) Simon lifts a rock 1.5 m by applying a force of 20 N. How much work does Simon do on the rock?
Answer:
W = Fd
= (20 N) (1.5 m)
= 30 J
Simon does 30 J of work on the rock.
2) Marie pulls an apple 4 m to the ground with a force of 2 N. How much work does Marie do on the apple?
Answer:
W = Fd
= (2 N) (4m)
= 8 J
Marie does 8 J of work on the apple. 3) Jasper does 450 J of work on an object by pushing the object 15 m at a constant speed. How much force does Jasper exert on the object? Answer:F = W / d= (450 J) / (15 m)= 30 N Jasper exerts 30 N of force on the object. 4) While throwing a football, a person exerts a forward force of 50 N on it and pushes it forward to a distance of 1.2 m. How much work does the person do on the football? Answer:W = Fd= (50 N) (1.2 m)= 60 J
The person does 60 J of work on the football.
5) A book weighing 2 kg is lifted from the floor to the desk which is 0.80 m from the floor. How much force is being exerted on the book? How much work is done on the book?
Answer:
F = mg
= (2 kg) (9.8 N / kg)= 19.6 N
19.6 N of force is being exerted on the book.
W = Fd
=(19.6 N) (0.80 m)
=15.68 J
15.68 J of work is done on the book.
6) A crane lifts a 4500 kg concrete pillar to a height of 44 m. How much force is exerted on the concrete pillar? How much work is done on the concrete pillar?
Answer:
F = mg
= (4500 kg) (9.8 N / kg)
= 44100 N
44100 N of force is exerted on the concrete pillar.
W = Fd
= (44100 N) (44 m)
= 19, 404, 00 J
19, 404, 00 J of work is done on the concrete pillar.
7) The brakes of a car apply a force of 15, 000 N to bring the car to a stop in a distance of 80 m. How much work is done on the car?
Answer:
W = Fd
= (15, 000 N) (80 m)
= 12, 000, 00 J
12, 000, 00 J of work is done on the car.
8) A helicopter does 50, 000 J of work to lift off from the ground to a height of 200 m. How much force is being exerted on the helicopter?
Answer:
F = W / d
= (50, 000 J) / (200 m)
= 250 N
250 N of force is being exerted on the helicopter.
1) Simon lifts a rock 1.5 m by applying a force of 20 N. How much work does Simon do on the rock?
Answer:
W = Fd
= (20 N) (1.5 m)
= 30 J
Simon does 30 J of work on the rock.
2) Marie pulls an apple 4 m to the ground with a force of 2 N. How much work does Marie do on the apple?
Answer:
W = Fd
= (2 N) (4m)
= 8 J
Marie does 8 J of work on the apple.
3) Jasper does 450 J of work on an object by pushing the object 15 m at a constant speed. How much force does Jasper exert on the object?
Answer:F = W / d= (450 J) / (15 m)= 30 N
Jasper exerts 30 N of force on the object.
4) While throwing a football, a person exerts a forward force of 50 N on it and pushes it forward to a distance of 1.2 m. How much work does the person do on the football?
Answer:W = Fd= (50 N) (1.2 m)= 60 J
The person does 60 J of work on the football.
5) A book weighing 2 kg is lifted from the floor to the desk which is 0.80 m from the floor. How much force is being exerted on the book? How much work is done on the book?
Answer:
F = mg
= (2 kg) (9.8 N / kg)= 19.6 N19.6 N of force is being exerted on the book.
W = Fd
=(19.6 N) (0.80 m)
=15.68 J
15.68 J of work is done on the book.
6) A crane lifts a 4500 kg concrete pillar to a height of 44 m. How much force is exerted on the concrete pillar? How much work is done on the concrete pillar?
Answer:
F = mg
= (4500 kg) (9.8 N / kg)
= 44100 N
44100 N of force is exerted on the concrete pillar.
W = Fd
= (44100 N) (44 m)
= 19, 404, 00 J
19, 404, 00 J of work is done on the concrete pillar.
7) The brakes of a car apply a force of 15, 000 N to bring the car to a stop in a distance of 80 m. How much work is done on the car?
Answer:
W = Fd
= (15, 000 N) (80 m)
= 12, 000, 00 J
12, 000, 00 J of work is done on the car.
8) A helicopter does 50, 000 J of work to lift off from the ground to a height of 200 m. How much force is being exerted on the helicopter?
Answer:
F = W / d
= (50, 000 J) / (200 m)
= 250 N
250 N of force is being exerted on the helicopter.
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~ Answers - About Energy
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