Question

frictional force is a contact force why?
​

Answer 1

$\mathscr\purple{HELLO!!}$

=> Friction is caused due to contact of two or more than two object, so frictional force is often called contact force. => Frictional force comes into play only when two surfaces are in contact. The resistive force is observed in the surface of the book and the surface of the table that are in relative motion.

Hope it helps you

Answer 2

Answer:

answer is in the image ....