The energy is not conserved because:
1. Energy may still be leaving the system through friction.
2. There could be measurement error that account for the missing energy
Given that a different group roll a round object down a ramp instead of dropping it. They measure the initial height to calculate gravitational potential energy, use the motion detector to track the final velocity, and calculate the kinetic energy of the object at the end.
Despite all their careful measurements, it appears that energy is not
conserved because
1. Energy may still be leaving the system through friction. In which the energy lost will be converted to thermal energy
2. There could be measurement error that account for the missing energy. The may occur due to systematic error or parallax error
The object is not moving as fast at the bottom as the initial gravitational potential would have led them to predict. This is not as a result of rotational energy. There is nothing like rotational energy.
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