Velocity & Acceleration of Elevator


by mimo6267
Tags: acceleration, elevator, velocity
mimo6267
mimo6267 is offline
#1
May4-11, 04:44 PM
P: 2
When the elevator approaches the top of a building and slows to a stop, what direction is the elevator's velocity & acceleration?
Phys.Org News Partner Science news on Phys.org
Internet co-creator Cerf debunks 'myth' that US runs it
Astronomical forensics uncover planetary disks in Hubble archive
Solar-powered two-seat Sunseeker airplane has progress report
praharmitra
praharmitra is offline
#2
May4-11, 05:28 PM
P: 311
kindly explain what you believe is the answer and why? or what you have done so far. You cannot expect us to answer your questions directly.
mimo6267
mimo6267 is offline
#3
May4-11, 05:47 PM
P: 2
I found that since the elevator is slowing to the stop, the direction of the elevator's acceleration would be downward. Since the elevator is always traveling at a constant velocity, does that mean when it slows to a stop, the velocity would still be constant, which means the direction would be horizontal? or since, the acceleration is downward that direction of velocity would also be downward? Thank you!

olivermsun
olivermsun is offline
#4
May4-11, 07:25 PM
P: 498

Velocity & Acceleration of Elevator


At the moment that the elevator is stopped, it doesn't really have a "direction." (E.g., Which way does an arrow with no length point?)

At any other moment the velocity certainly has a direction (which you seem able to describe)!
praharmitra
praharmitra is offline
#5
May4-11, 08:04 PM
P: 311
Quote Quote by mimo6267 View Post
I found that since the elevator is slowing to the stop, the direction of the elevator's acceleration would be downward. Since the elevator is always traveling at a constant velocity, does that mean when it slows to a stop, the velocity would still be constant, which means the direction would be horizontal? or since, the acceleration is downward that direction of velocity would also be downward? Thank you!
You're absolutely right about the acceleration. However, the elevator is NOT travelling at constant velocity!

For an object with constant velocity, its acceleration must be zero, which is clearly not the case here. Now at its top most point the elevator slows down and comes to a complete HALT before moving downwards again. At that point therefore, the velocity of the elevator is ZERO!

Also, the zero vector doesn't really have a defined direction.


Register to reply

Related Discussions
Acceleration in an elevator! Introductory Physics Homework 4
Acceleration of an Elevator Introductory Physics Homework 2
elevator's z acceleration Introductory Physics Homework 1
Position, Acceleration, and Velocity of an Elevator Introductory Physics Homework 3
acceleration in an elevator Introductory Physics Homework 4