Work, Energy & Power: Essential Concepts for Exam Success

Work, Energy & Power

Q. If a machine has a power output of 200 W, how much work can it do in 5 seconds? (2000)

A. 500 J
B. 1000 J
C. 1500 J
D. 2000 J

Solution

Work done (W) = Power (P) × Time (t) = 200 W × 5 s = 1000 J.

Correct Answer: B — 1000 J

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Q. If a person does 200 J of work in 5 seconds, what is their power output?

A. 40 W
B. 50 W
C. 60 W
D. 30 W

Solution

Power (P) = Work (W) / Time (t) = 200 J / 5 s = 40 W.

Correct Answer: B — 50 W

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Q. If a person does 300 J of work in 15 seconds, what is their average power output?

A. 20 W
B. 15 W
C. 25 W
D. 30 W

Solution

Power = Work / Time = 300 J / 15 s = 20 W

Correct Answer: A — 20 W

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Q. If a person does 300 J of work in 15 seconds, what is their power output?

A. 20 W
B. 15 W
C. 25 W
D. 30 W

Solution

Power = Work / Time = 300 J / 15 s = 20 W

Correct Answer: A — 20 W

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Q. If a person does 500 J of work in 5 seconds, what is their power output?

A. 100 W
B. 50 W
C. 200 W
D. 150 W

Solution

Power (P) = Work (W) / Time (t) = 500 J / 5 s = 100 W.

Correct Answer: A — 100 W

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Q. If a person lifts a 20 kg box to a height of 2 m, what is the work done against gravity? (g = 9.8 m/s²)

A. 392 J
B. 196 J
C. 588 J
D. 784 J

Solution

Work = m * g * h = 20 kg * 9.8 m/s² * 2 m = 392 J.

Correct Answer: B — 196 J

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Q. What is the power output of a motor that does 1200 J of work in 30 seconds?

A. 20 W
B. 40 W
C. 60 W
D. 80 W

Solution

Power = Work / Time = 1200 J / 30 s = 40 W.

Correct Answer: C — 60 W

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Q. What is the power output of a motor that does 3000 J of work in 15 seconds?

A. 200 W
B. 300 W
C. 400 W
D. 500 W

Solution

Power = Work / Time = 3000 J / 15 s = 200 W.

Correct Answer: B — 300 W

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Q. What is the work done by a force of 15 N acting at an angle of 60° while moving an object 4 m? (2021)

A. 30 J
B. 60 J
C. 45 J
D. 90 J

Solution

Work = F × d × cos(θ) = 15 N × 4 m × cos(60°) = 15 × 4 × 0.5 = 30 J.

Correct Answer: C — 45 J

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Q. What is the work done when a 50 N force moves an object 3 m in the direction of the force?

A. 150 J
B. 100 J
C. 50 J
D. 200 J

Solution

Work done (W) = F × d = 50 N × 3 m = 150 J.

Correct Answer: A — 150 J

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Q. What is the work done when a force of 15 N moves an object 3 m at an angle of 0 degrees to the direction of motion?

A. 45 J
B. 30 J
C. 60 J
D. 75 J

Solution

Work = Force * Distance * cos(θ) = 15 N * 3 m * cos(0°) = 45 J.

Correct Answer: A — 45 J

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Q. What is the work done when a force of 15 N moves an object 3 m at an angle of 60° to the direction of the force?

A. 22.5 J
B. 30 J
C. 36.5 J
D. 45 J

Solution

W = F × d × cos(θ) = 15 N × 3 m × cos(60°) = 15 × 3 × 0.5 = 22.5 J.

Correct Answer: A — 22.5 J

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Q. What is the work done when a force of 15 N moves an object 4 m in the direction of the force?

A. 60 J
B. 30 J
C. 45 J
D. 75 J

Solution

Work done = Force × Distance = 15 N × 4 m = 60 J

Correct Answer: A — 60 J

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Work, Energy & Power

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