Register to reply 
Vertical spring  elevator question 
Share this thread: 
#1
Apr2208, 02:18 PM

P: 126

A mass is attached to a spring supported from the ceiling of an elevator. We pull down on the mass and let it to vibrate. If the elevator starts to accelerate(fixed accelerate) upward,
1) How the maximum velocity changes? 2) How the amplitude changes? 3) How the total energy changes? I think the amplitude and maximum velocity does not change. Because the acceleration doesn't change the net force but only slide down the equilibrium point. Am i right? 


#2
Apr2208, 02:36 PM

Emeritus
Sci Advisor
PF Gold
P: 9,772

P.S. We have Homework Forums for all your textbook questions. 


#3
Apr2208, 02:40 PM

P: 175

___
M === \_\ /_/ \_\ __ .... /\ .... . .... . moving upward __. 


#4
Apr2208, 02:45 PM

Emeritus
Sci Advisor
PF Gold
P: 9,772

Vertical spring  elevator question



#5
Apr2208, 03:18 PM

Emeritus
Sci Advisor
PF Gold
P: 9,772




#6
Apr2208, 10:42 PM

P: 175

__________________ [tex]  \amalg \cdot \cdot \cdot \cdot \mp \cdot \cdot \cdot \cdot  \amalg  [/tex] [tex]  \amalg \cdot \cdot \cdot \cdot \bigcap \cdot \cdot \cdot \cdot  \amalg  [/tex] [tex]  \amalg \cdot \cdot \cdot \cdot M \cdot \cdot \cdot  \amalg  [/tex] [tex]  \amalg \cdot \cdot \cdot \cdot \bigsqcup \cdot \cdot \cdot \cdot  \amalg  [/tex] [tex]  \amalg \cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot  \amalg  \Uparrow Moving Up [/tex] [tex]  \amalg \cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot  \amalg  [/tex] [tex]  \amalg \cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot  \amalg  [/tex] [tex]  \amalg \cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot  \amalg  [/tex] [tex]  \amalg \cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot  \amalg  [/tex] __________________ 


#7
Apr2308, 07:21 AM

P: 126




#8
Apr2308, 08:53 AM

Emeritus
Sci Advisor
PF Gold
P: 9,772




#9
Apr2308, 09:20 AM

P: 126

I want to understand the effects of adding force and adding mass while it is vibrate. As you are approved, additional force on motion is not change the amplitude and maximum velocity. Now I wonder, how the mass change the amplitude and max velocity?
Now there is not an elevator. The same spring and mass attached to the ceiling of a door instead of an elevator and vibrating. While the mass in bottom position, an additional mass attached to other one suddenly. What happens now? I think, as previous problem, the equilibrium point slides down. The amplitude will not change because net force was not change. But maximum velocity will reduce because period will increase and distance was not change. Am I right now? 


#10
Apr2308, 10:31 AM

Emeritus
Sci Advisor
PF Gold
P: 9,772




#11
Apr2308, 03:39 PM

P: 126

I mean period proportional with mass. If mass increase period will too. Now, if amplitude the same as before then the distance for quarter period is the same too. So I think, distance the same, if time increased then average velocity must reduce.
As I understood you agree with about maximum velocity reduce. But I can not calculate these. Any suggestion? 


Register to reply 
Related Discussions  
Vertical Spring  Introductory Physics Homework  8  
Spring and elevator  Introductory Physics Homework  5  
Elevator and Spring question  Introductory Physics Homework  2  
Vertical spring  Introductory Physics Homework  3  
Spring elevator question  Introductory Physics Homework  6 