Nebraska NSCAS Science Grade 8 Practice Questions - Nebraska Student-Centered Assessment System Science - Grade 8 Exam

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A car accelerates from rest and its speed increases. A student claims the car's kinetic energy doubles when its speed doubles. Is this claim correct, and why?

No. Kinetic energy depends on the square of the speed, so doubling speed quadruples kinetic energy. Yes. Kinetic energy is directly proportional to speed, so doubling speed doubles the energy. No. Kinetic energy does not depend on speed at all. Yes. Kinetic energy triples when speed doubles because of momentum.

Correct Answer:

No. Kinetic energy depends on the square of the speed, so doubling speed quadruples kinetic energy.

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