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Join PAF - Academic Test - Physics - Work and Energy - Quiz 3

Practice 10 high yield MCQs on Physics from Chapter Work and Energy for Academic Test. After submission, get instant results with correct answers and detailed explanations. This is Quiz 3 of the series.

21. What does the area under a force-displacement graph represent?



22. What is the formula for efficiency?



23. Can a machine have 100% efficiency?



24. KE is proportional to what power of speed?



25. If speed doubles, what happens to KE?



26. What are the units of spring constant?



27. What is the max height of a 2 kg ball thrown at 10 m/s (g=10)?



28. What work is needed to accelerate a 1000 kg car from 10 to 20 m/s?



29. What is the spring constant if 20 N stretches it 0.5 m?



30. What is the power of a 50 kg person climbing 10 m in 20 s (g=10)?



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Instructions: Select one answer per question. After submitting, you will see your score, correct answers, and explanations.

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