Free Work and Energy MCQs with Answers
748 Work and Energy MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Work transfers energy when a force causes displacement, while kinetic energy, gravitational potential energy and power describe motion, position and the rate of energy transfer. The work-energy theorem links net work with change in kinetic energy, and efficiency accounts for energy losses rather than treating them as energy destruction.
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Read the Work and Energy notesFree MDCAT chapter notes with key terms748 questions · page 38 of 38
- A. 2.5 W
- B. 25 W
- C. 75 W
- D. 2000 W
Explanation: To find the rate at which the force is doing work (power), we first need to determine the velocity of the crate after it has moved 2…
Correct answer: 2000 W- A. 10 m/sec
- B. 36 m/sec
- C. 40 m/sec
- D. 45 m/sec
Explanation: To solve the problem, we first calculate the gravitational potential energy (PE) of the object when it is released from a height of 8 m.
Correct answer: 10 m/sec- A. 10 J
- B. 1 J
- C. 0 J
- D. 5 J
Explanation: To calculate work done, the formula is Work = Force × Displacement × cos(θ), where θ is the angle between the force and displacement…
Correct answer: 0 J- A. Negative
- B. Positive
- C. Zero
- D. Maximum and positive
Explanation: When the body moves against the force of friction on a horizontal plane, the work done by the body is negative.
Correct answer: Negative- A. Nonconservative
- B. Conservative
- C. Both conservative and nonconservative
- D. None of the above
Explanation: Non-conservative forces are those that do work on an object, resulting in dissipation or loss of energy.
Correct answer: Nonconservative- A. Negative
- B. Positive
- C. Zero
- D. All of the above
Explanation: When a person pulls their friend in the opposite direction of the bicycle's motion, the work done by them is negative.
Correct answer: Negative- A. Each point on the curve
- B. Slope of the curve
- C. Area under the curve
- D. None is true
Explanation: This is the correct option. The work done is equal to the area under the curve on a force-displacement graph.
Correct answer: Area under the curve- A. 120 J
- B. 100 J
- C. 1000 J
- D. 1200 J
Explanation: The work done on an object when it is lifted can be calculated using the formula: Work = Weight x Height.
Correct answer: 1200 J