Engineering Board Exam Reviewer · Engineering Mechanics · medium
A 21 kg block rests on an incline of 30° with a coefficient of friction of 0.3. What minimum force, applied parallel to the incline, is needed to push the block up the incline at constant velocity?
- 103.01
- 49.48
- 156.53
- 61.8
Answer
C. 156.53
Solution
W = mg = 206.01 N. To move up at constant velocity: F = W( + ) = 206.01( 30° + 0.3 30°) = 156.53 N.
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