Question

what are effort of forces on area of acting of contact of surfaces​

Answer 1

Answer:

A force is a push or pull acting upon an object as a result of its interaction with ... the force resulted from the contact or non-contact of the two interacting objects. ... is the force exerted by a surface as an object moves across it or makes an effort to ... (e.g., a skydiver or a downhill skier) or for objects with large surface areas

Explanation:

Answer 2

Answer:

Greater contact area means greater frictional force. If the contact area is proportional to the normal force, then this looks just like Amontons' Law with the frictional force proportional to the normal force. Of course this model "breaks" when the contact area can no longer increase.