Two solid balls (one large,the other small)and a cylinder roll down a hill.Which has the greatest speed at the bottom and which the least?
A)The large ball has the greatest; the small ball has the least.
B)The small ball has the greatest; the large ball has the least.
C)The cylinder has the greatest; the small ball has the least.
D)The cylinder has the greatest; both balls have the same lesser speed.
E)Both balls have the same greater speed; the cylinder has the least.

Question

Quizplus · Accepted Answer

The moment of inertia is lowest for spheres (solid balls) compared to a cylinder, meaning they will accelerate faster and reach the bottom first. The size of the ball does not affect the speed for solid balls of uniform density, so both balls will have the same speed, which will be greater than that of the cylinder.

Two Solid Balls (One Large,the Other Small)and a Cylinder Roll