- #1
songoku
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- Homework Statement
- The work done of friction is always:
a. positive
b. negative
c. zero
d. any of these
- Relevant Equations
- W = F.d
The answer key is (b) but in my opinion it should be (d) because I think about work done by friction on wheel of car when the car moves. Let say the car moves to the right, then the wheel will rotate clockwise and the direction of friction acting on the wheel by the road will be to the right and since the displacement is also to the right the work done by friction on the wheel is positive.
Am I missing something? Thanks
Am I missing something? Thanks