Question

Q1) If static friction between two surface X and Y found to be 20 N than the rolling friction between these two surfaces should most likely be:

a) 25 N

b) 20 N

c) 5 N

d) 50 N

Q2)Which of the following will produce maximum friction?

a) Rubbing of sand paper with glazed paper

b) Rubbing of sand paper with sand paper

c) Rubbin gof sand paper with glass table

d) Rubbin gof sand paper with aluminium frame

Answer 1

1-(c) 5 N
Usually rolling friction is less than static friction.
2-​b) Rubbing of sand paper with sand paper