Question

An elevator suspends from a verticle cable and the elevator accelerates upward. is the tension in the cable

a. greater than the elevators

b. lower than the elevators

c. the same

d. cannot be determined

what about if it was accelerated downwards?

Answer 1

This is an application of Newton's and Law. If we draw a free body dicegram of elevator like shown in fig. below.. (eble DOT Elevator. Here, T- is the tension acting upward W is the weight due to gravit, acting downward

since, the elevator is moving up or down there are a forces acting on the elevator 17 The tension, in the cable pulling the elevator up le upward and 2) The gra- -vity pulling down le downward. There Fore, see to keep the ele- evator from acclerating upwardar downward basically to keep it at a constant velocity so, the tension force must be equal to the force of gravity of the eleva- - tor EX Suppose, if the elevator is to be in free to fall say at 9.8 m/s2) then the cable would provide no force at all and law is thus according to Newton fret - T-W

DATE: if finel = 0 os. T = W