Question

a box is resting on the floor.To move it a(variable) force is appliedas shown in the diagram below.
(a) Give the likely value of limiting force(a)
(b) Why does the box stay at rest in the cases corresponding to Fig(a) and Fig(b).
(c) Mark the directions of frictional force,and mention the kind of frictional force that comes into play, in each case. ​

Answer 1

Answer:

A) limiting friction is 3F as friction is just beaten at the moment force is 3F

b) box stays at rest as the applied for ce is nit being able to beat the frictional force between the block and the surface it is restin upon meaning that the applied force in both the cases is less than the static friction between the block and the surface.

c)direction of friction in all the cased will be to the opposite of applied force... in a and b static friction is present and in c limiting friction which instantly changes to kinetic friction is present.