AP Physics 1 Question 301: Answer and Explanation

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Question: 301

9. In real projectile motion, an object experiences three forces: gravity, drag, and lift. These are depicted in the picture above. Given this information, how does lift affect the speed of a projectile?

  • A. Increases
  • B. Decreases
  • C. Varies
  • D. It has no effect.

Correct Answer: D



Because the lift force is perpendicular to the velocity of the object, lift can have no effect on the magnitude of velocity. The magnitude of velocity is also known as speed, so (D) is correct.