Question

A body of mass 2 kg and surface area 10 cm2

begins to

slide down on inclined plane when the angle of

inclination is pie / 6. If the surface area of the same

body is made 20 cm2

keeping the mass unchanged, it

will begin to slide down when the angle of inclination

is:

(a) pie / 2 (b) pie / 6

(c) pie / 3 (d) 2 / 3​

Answer 1

Answer:

The downward force experienced by the body on the slope = m*g*sin(pie/6),

where m = mass , g = gravity.

Now, keeping this equation in mind, we can comment that the "force experienced doesn't depend on the surface area of contact."

Again, the friction experienced

= u*N, where u = coefficient of the friction and N = normal reaction.

Friction doesn't depend on surface area of contact.

So, in the new case, the body will again start sliding down at the angle of:

(Pie/6).

OPTION B) IS THE CORRECT ANSWER.