hoop rolls with constant velocity and without sliding along level ground. Its rotational kinetic energy is:
Correct answer: D. The same as its translational kinetic energy
- A. Half its translational kinetic energy
- B. twice its translational kinetic energy
- C. four times is translational kinetic energy
- D. The same as its translational kinetic energy
Explanation
For a hoop rolling without slipping, its rotational kinetic energy is equal to its translational kinetic energy. The sum of the two kinetic energies contributes to the total kinetic energy
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About Kinetic Energy
Kinetic energy is the energy of motion, given for a nonrelativistic object by K = ½mv², so it depends on mass and the square of speed. Questions connect kinetic energy with work through the work energy theorem, calculate changes in kinetic energy, and distinguish it from momentum and potential energy.
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