Question

A book of dimensions 30X10X40 is kept on floor. In which case friction is most

a. by making 30 X 10 as base

b. by making 40 X 10 as base

c. by making 30 X 40 as base

d. it will be same in all cases

also explain how?​

Answer 1

Answer:

(c) by making the base 30×40

Explanation:

because as much as the area will increase the friction will also increase i.e. the friction is maximum with maximum area

Answer 2

Answer:

Option (c) by making 30 X 40 as base.

Explanation:

1. Friction is directly proportional to the surface area, and thus the surface with the most area will have most friction.

2. The area in (a) is 300 sq. u, in (b) is 400 sq. u, in (c) is 1200 sq. u.

3 So thus the surface with most surface area is the 30 X 40 surface as base.