# Answer on Mechanics | Relativity Question for Brandon

Question #17804

A disk and a sphere are released simultaneously at the top of an inclined plane. They roll down without slipping. Which will reach the bottom first?

a. the one of smallest diameter

b. the one of greatest mass

c. the sphere

d. they will reach bottom at same time

a. the one of smallest diameter

b. the one of greatest mass

c. the sphere

d. they will reach bottom at same time

Expert's answer

Answer is d.

There are only two forces that have influence on the motion of the both disk

and sphere.

Those are gravity and friction forces.

They both the same for sphere and disk - the gravity force does not depend on

mass and friction force is the same because disk and sphere are moving in the

same manner - they are rolling down.

so, they will move with the same speed

There are only two forces that have influence on the motion of the both disk

and sphere.

Those are gravity and friction forces.

They both the same for sphere and disk - the gravity force does not depend on

mass and friction force is the same because disk and sphere are moving in the

same manner - they are rolling down.

so, they will move with the same speed

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