Question
. An inclined plane which makes slopes at 37° is used to raise a 10kg object to an If the efficiency of the machine is 80%. Determine
a. the load force b. the µk c. the effort force d. the MA
a. the load force b. the µk c. the effort force d. the MA
Answers
weight component down slope = m g sin 37 = 10 * 9.81 * sin 37
= 59 Newtons = a, the load force
so
c, the effort force = 59 / 0.8 = 73.8 Newtons
so the friction force is 73.8 - 59 = 14.8 Newtons
normal force of weight = m g cos 37 = 78.3 Newtons
µk * 78.3 = 14.8
so µk = 0.189 (part b)
MA = weight / effort force = 98.1 / 73.8
= 59 Newtons = a, the load force
so
c, the effort force = 59 / 0.8 = 73.8 Newtons
so the friction force is 73.8 - 59 = 14.8 Newtons
normal force of weight = m g cos 37 = 78.3 Newtons
µk * 78.3 = 14.8
so µk = 0.189 (part b)
MA = weight / effort force = 98.1 / 73.8
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