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FCAT Grade 8 Science Assessment Practice Questions

Category - FCAT Science Assessment Grade 8

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An elastic collision is best defined as what?
  1. When kinetic energy is conserved before and after the collision.
  2. The two colliding bodies have conserved momentum, and stick together at the collision point.
  3. Potential energy is conserved before and after the collision.
  4. Sound or heat is generated during the collision.
  5. The colliding bodies are stretchy in nature and conserve their momentum.
Explanation
Answer: A - Kinetic energy is conserved before and after an elastic collision. In nature, there is no such thing as a perfectly elastic collision due to friction or air resistance forces, meaning some kinetic energy is always lost when objects collide.
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