Question

a block of mass 10kg is on rough horizontal surfaces A horizantal force is 4N applied on it.it coefficient of static friction between those two surfaces is 0.5 then frictional force between the two surfacecin contact is

Answer 1

although by calculation we get frictional force as 50N, it applies only 4N against applied force because of Newton's 3rd law. As applied force increases so does static friction. but in case of kinetic friction it remains constant .