A ring, cylinder, solid sphere, and hollow sphere are all released from rest from the same height on an inclined surface, at the same time. All four objects have uniform density, have the same mass, same radius, and roll without slipping. 1. Which one has the largest total kinetic energy at the bottom? a) ringb) cylinderc) solid sphered) hollow spheree) they all reach the bottom with the same total kinetic energy2. Which one reaches the bottom last? a) ringb) cylinderc) hollow sphered) solid spheree) they all reach the bottom at the same time

Question

Jamison Lyons

Physics

18 October, 23:20

A ring, cylinder, solid sphere, and hollow sphere are all released from rest from the same height on an inclined surface, at the same time. All four objects have uniform density, have the same mass, same radius, and roll without slipping. 1. Which one has the largest total kinetic energy at the bottom? a) ringb) cylinderc) solid sphered) hollow spheree) they all reach the bottom with the same total kinetic energy2. Which one reaches the bottom last? a) ringb) cylinderc) hollow sphered) solid spheree) they all reach the bottom at the same time

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Answers (1)

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Aidan Wells · Answer 1

The expression for acceleration of the rolling body on an inclined plane is given as a = gsinФ/1 + k²/R² where Ф is the angle of inclination, R is the radius, k is the radius of gyration. The potential energy of the system is given as; PE = mgh The potential energy will be constant for ring, cylinder, solid sphere, and hollow sphere. The total kinetic energy of the rolling body is; KE = mv²/2 + Iw²/2 Hence, the total kinetic energy of the ring, cylinder, solid sphere and hollow sphere will be constant.

2. The moment of inertia of the ring is given as;

I = mR²

The moment of inertia of the ring is maximum and therefore reaches the bottom last.