An elevator starts from rest at the bottom of a building and is now moving steadily...
An elevator starts from rest at the bottom of a building and is now moving steadily upward (no longer speeding up). Which statement is correct about its motion now and why?
A) The net force on the elevator is zero
B) The net force on the elevator is greater than zero
C) The net force on the elevator is negative, downward
D) The net force is equal to the weight of the elevator
Homework Answers
When you are looking at the instant when the elevator is at rest
or when the elevator is moving with a constant speed, then the NET
FORCE ON THE ELEVATOR has to be ZERO.
This is derived from Newton's Second law, which states that force
leads to an acceleration, i.e., change in velocity.
As the velocity is constant, then there is not need of any net
force on the elevator
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