Question

When we apply some force on an object held stationary at a place, then
force of friction comes into play in direction opposite to the direction of
motion of the object.
When the applied force is doubled (object is still at rest), then friction
becomes​

Answer 1

Explanation:

When we apply some force on an object held stationary at a place, then

force of friction comes into play in direction opposite to the direction of

motion of the object.

When the applied force is doubled (object is still at rest), then friction

becomes double

Answer 2

Answer

If the object is at rest and the force is applied on it then, friction force is always equal to force applied( equal in magnitude opposite in sign) and hence they cancel out each other.

So, when the force applied is doubled the frictional force will also be doubled

Thanks