MCAS Physics Exam Practice

Category - Introductory Physics

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Which of the following is the best example of work being done on an object?

holding a 50 kg barbell
lifting a bag of groceries
keeping a board in place
pushing on a car that will not move

Explanation

Answer: B - lifting a bag of groceries

Work is force that transfers energy or movement between a system and its surroundings. In this case the work is moving the grocery bag.

This isn't actually the greatest question ever written. You could argue work is being done in examples A, Cand D. Holding a barbell counters the force of gravity. Answer C has an ambiguous wording. In D the amount of work done isn't enough to overcome the weight of the car.

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