Question

ort Answer Questions
Which type of surface produces—(i) least friction? (ii) too much friction?
Why it is difficult to walk on a wet marble floor?
What is the purpose of using ball bearings in machines?
Why is the surface of a slide polished to make it smooth?
is the frictional force always undesirable? No
Answer Questions​

Answer 1

Answer:

it is difficult to walk on wet marble floor because the water on wet marble floor fills the microscopic irregularities and hence present less frictional force.

(i) smooth and polished surface provides less friction.For eg:-polished marble, frozen river.

(ii) Rough and unpolished surface provides too much friction.