AP Physics 1 Question 4: Answer and Explanation
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If the coefficient of friction between the block and the incline is 0.4, how much work is done by the normal force on the block as it slides down the full length of the incline?
- A. 0 J
- B. 2.0 J
- C. 4.0 J
- D. 4.9 J
Correct Answer: A
A Since the normal force is perpendicular to the object's displacement, it does no work.