Asked by Jamie
A 5 kg block is being held against the wall. What is the minimum force needed to keep the block from moving if the force is applied at an angle that is 15 degrees above the horizontal. The coefficient of static friction between the wall and the block is 0.275.
Answers
Answered by
Damon
force = F
F sin 15 = F up
F cos 15 = F horizontal = F normal to wall
friction = mu F cos 15 up
total up= F sin 15 + .275 F cos 15
Fdown = m g = 5*9.81 = 49 Newtons
so
F (sin 15 + 0.275 cos 15) = 49
F sin 15 = F up
F cos 15 = F horizontal = F normal to wall
friction = mu F cos 15 up
total up= F sin 15 + .275 F cos 15
Fdown = m g = 5*9.81 = 49 Newtons
so
F (sin 15 + 0.275 cos 15) = 49
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