A light aluminum ball and a heavy lead ball of the same size are allowed to roll down an incline. When they are halfway down the incline, they will have identical

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Quizplus · Accepted Answer

Since both balls are of the same size but different materials, they will have different masses and thus different inertias (C is incorrect). When rolling down an incline, the heavier lead ball will have more momentum due to its greater mass (A is incorrect). The kinetic energy of an object depends on both its mass and its velocity. Assuming no friction, both balls should reach the bottom with the same velocity if they start from rest, but their kinetic energies will differ due to their different masses (B is incorrect). Potential energy depends on height, mass, and gravity. Since they are at the same height halfway down, but have different masses, their potential energies will be different (D is incorrect).

A Light Aluminum Ball and a Heavy Lead Ball of the Same