A Block Sits on a Slight Incline, Held at Rest

question 34

Multiple Choice

A block sits on a slight incline, held at rest by the frictional force between the block and the incline. Which of the following statements is true?

• A) The frictional force performs no work, since there is no motion of the block.
• B) The work by the frictional force is equal to the gravitational potential energy of the block.
• C) The work done by the frictional force is negative, since the force of friction opposes the direction that the block is being tugged by gravity.
• D) The work done by gravity is entirely converted into heat because of the friction present.
• E) None of these is true.

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