Question

plz say about contact force and normal reaction and force of friction as fast as possible

Answer 1

==)contant force is a force that acts at the point of contact between two objects in contrast to body forces Contact forces are described by Newton's laws of motion as with all other forces in dynamics Contact forceis the force in which an object comes in contact with another object
==)The force exerted by a surface on an object in contact with it which prevents the object from passing through the surface the force is perpendicular to the surface and is the only force that the surface exerts on the object in the absence of frictional forces
==)Friction is the force resisting the relative motion of solid surfaces fluid layers n material elements sliding against each other