Question

A box is resting on the floor to move it a variable force is applied as shown in the diagram below-
(a)give the value of the force of limiting friction.
(b)why does the box stay at the rest in the case corresponding to figure "a" and figure "b".
(c) comma mark the direction of frictional force and mention the kind of frictional force that comes into play in each case.

Answer 1

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.

Answer 2

Answer:

(a). 3f

(b). if this situation static friction is greater than aur equal to the applied force show the box at rest.

(c). Toward left