Practice Quiz

Praxis II General Science

Category - Major Ideas

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Charles is trying to move a heavy boulder up a hill, but is having some trouble. Sam tells him that rolling it up the hill will be much easier than lifting it. This is because:
  1. Rolling and lifting the boulder involve the same amount of work.
  2. The boulder transfers a lot of force to Charlie as he lifts it.
  3. Less work is done when rolling the boulder.
  4. Less power is needed to roll a boulder compared to lifting it.
  5. Lifting the boulder requires muscles, but rolling it does not.
Explanation
Answer: C - When rolling the boulder, less work is done. This is because the force exerted by gravity on the boulder will no longer have to be borne by Charles. Instead he only has to produce enough work to overcome the height of the hill.
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