O-LevelPhysicsEnergy & Work5054/11 · May/June 2012 · Q131 Mark
A ball is held at rest on one side of a curved track. The ball is released. It rolls down one side of the track and part of the way up the other side. It then stops, before rolling back down again. The height of the stopping point is less than that of the starting point. What is the sequence of energy changes between starting and stopping for the first time?
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Apotential energy → kinetic energy → potential energy
Bpotential energy → kinetic energy → heat → potential energy
Cpotential energy → heat → kinetic energy → potential energy
Dpotential energy → kinetic energy + heat → potential energy + heat
✓ Correct answer
D: potential energy → kinetic energy + heat → potential energy + heat
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