AP Physics 1 Question 429: Answer and Explanation

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Question: 429

7. A 2,000 kg car has a head-on collision with a 1,000 kg car. How does the impact force on the heavier car compare with that of the smaller car?

  • A. The heavier car experiences a greater impact force.
  • B. The smaller car experiences a greater impact force.
  • C. Both vehicles experience an impact force with the same magnitude.
  • D. Cannot be determined

Correct Answer: C



By Newton's Third Law, when the heavier car exerts a force on the smaller car, that small car exerts an equal but opposite force back onto the heavy car. While the forces are in opposite direction, both forces have the same magnitude.