AP Physics 1 Question 32: Answer and Explanation

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Question: 32

2. An elevator is rising. In order to determine the tension in the cables pulling it, which values (for the elevator) would you need to know?

  • A. Mass, velocity, height, and acceleration
  • B. Mass, velocity, and acceleration
  • C. Mass and velocity
  • D. Mass and acceleration

Correct Answer: D

Explanation:

D According to Newton's Second Law, Fnet = ma, so we can say

Fnet = T - Fg = ma
T = ma + Fg
T = ma + mg

Since g is a constant, we only need to know mass and acceleration to solve for tension.