Question

Your boss has asked you to move some boxes in a warehouse. In each box is a refrigerator that has a mass of 80kg. a) If the µs is 0.25 would you be able to move the box with a force of 180N? b) What is the minimum force required to make the boxes move? c) What would be the required coefficient of friction in order to move the boxes with a constant velocity if the applied force was 100N?

Answer 1

a)

$F_{fr}=\mu mg=200~N>F'=180~N,$

would not be able to move the box,

b)

$F_{min}=F_{fr}=200~N,$

c)

$\mu=\frac{F''}{mg}=0.125.$