Question

1. A slab of mass 4.0 kg is placed on a surface. The coefficient of static friction is 0.4. Find the friction
force between the slab and the surface. (g = 10 m/s2)​

Answer 1

Answer:

if the surface is horizontal then no friction would operate on it if no force is trying to disturb it's state of rest. As in the question there is nothing said about any force trying to change it's state.

STILL,

if some other horizontal force is acting on it then the static friction would depend on that force. static friction is self adjusting force and thus do not have a particular value.

IF QUESTION IS WHAT CAN BE THE MAXIMUM VALUE OF STATIC FRICTION OR WHAT CAN BE THE VALUE OF LIMITING VALUE OF STATIC FRICTION THEN ONE CAN ANSWER AS :

maximum static friction which can operate = #mg

= 0.4×4× 10= 16N

Answer 2

16N

Step-by-step explanation:

μ=F/N

where F is Frictional force and N is the normal force and μ is coefficient of friction.

In static friction, the frictional force resists force that is applied to an object , and the object remains in rest until the force of stativc friction is overcome

$0.4*10=F/4$

$F=4*4$

F=16N