1. :This gives 5 J for the rotational energy in a small helicopter. 2. The tree roots may rotate, via the rotational energy of the rockfall. 3. The rotational energy typically comes from an engine or electric motor. 4. A second consideration is the rotational energy stored in the wheels. 5. Part of the earth's rotational energy can also be tapped using tidal power. 6. Where friction is important, like on Earth, objects lose rotational energy and stop spinning. 7. Energy is stored in the rotor as kinetic energy, or more specifically, rotational energy : 8. A "'flywheel "'is a rotating mechanical device that is used to store rotational energy . 9. This expression is without translational energy, rotational energy , vibrational excitations, and other such considerations. 10. Another example of actually using earth's rotational energy is the locating of opportune spaceports.
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