AP Physics 1 Question 32: Answer and Explanation
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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
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.