why the rounded stone rolls faster than plastic ball?

Answer 1

Assuming the stone and ball weigh the same. A solid sphere like the stone has a lower moment of inertia than the hollow sphere ball. The lower moment allows it to accelerate faster down an incline.

Answer 2

if u have a stone and a plastic ball of same weight and if u roll it over an inclined plane the stone makes to the end fasterthan the ball because of the following. basically ur plastic ball or some other balls r hollow so the distance of the mass from its center of gravity is a little bit longer. moment of inertia is directly propotional to the distance2 .but on other hand the speed of rolling is inversely proportional to moment of inertia.so ur stone which has lesser moment of inertia rolls down quickly than the other one.

Answer 3

rotational inertia
rotational inertia is basically resistance to rotating, which an object must do to move down a hill or other incline. simpyl, the equation for a solid sphere is:
I (intertia)=2/5mrr
while for a hollow sphere it is
I=mrr

so with the same mass, an solid object would have 2/5 the inertia

Answer 4

I believe that a plastic ball will lose some of its kinetic energy because of its elasticity, some of its energy will be consumed in the material and eventually it will be converted to heat

Answer 5

it experiences less friction and also its inertia is greater