Test: MCAT Physical

Two students (student X and student Y) lift a boulder vertically from point A to point B. Student X directly lifts the boulder from point A to point B, whereas student Y uses a pulley to lift the boulder. This allows student Y to apply a force () that is three times smaller than the force applied by student X (). Both students apply force upwards and take the same amount of time to complete this task.

The vertical distance between point A and point B is .


Student Z uses an inclined plane to lift the boulder and exerts only one third of . Which of the following quantities is not equal for student Z and student X?

I. The change in potential energy

II. The distance travelled

III. The sum of the change in kinetic energy and change in potential energy

I only

II only

I and III

I and II

1/36 questions


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