Question

1. Fill in the blanks: -
a. The frictional force is caused by the interaction of a body with________
b. Noneof the solid surfaces are perfectly ________
C. Two ______ surfaces when placed together meet only at certain points.
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Answer 1

Answer:

A = IRREGULARITIES

B= SMOOTH

Answer 2

Answer:

a) Irregularities. b) Smooth..