Register to reply

Counter rotation theory problem

by Smartguy94
Tags: counter, rotation, theory
Share this thread:
Smartguy94
#1
Nov28-11, 06:47 PM
P: 41
1. The problem statement, all variables and given/known data
A meter stick rests on two counter-rotating wheels. The left wheel rotates clockwise while the right wheel rotates counter-clockwise. There is friction between the meterstick and each wheel. The meter stick begins off-center to the right. What is the resulting motion of the meter stick?

3. The attempt at a solution

Wouldn't the meter stick simply just not move because the two wheel velocity cancel one another? but I got it wrong.


would it be The stick will be sent off the wheels to the right?
because the stick was off-center to the right at first?

or would it be The stick will oscillate back and forth?
or Nothing can be said about the stick's motion?
or The stick will be sent off the wheels to the left?

I'm quite confused
Phys.Org News Partner Science news on Phys.org
Hoverbike drone project for air transport takes off
Earlier Stone Age artifacts found in Northern Cape of South Africa
Study reveals new characteristics of complex oxide surfaces
Spinnor
#2
Nov28-11, 07:59 PM
P: 1,368
If the wheels rotated slowly the stick would be balanced between the wheels. Make the following to prove it to yourself,
Attached Thumbnails
2011_1128_205752AA.jpg  
Smartguy94
#3
Nov28-11, 08:14 PM
P: 41
Quote Quote by Spinnor View Post
If the wheels rotated slowly the stick would be balanced between the wheels. Make the following to prove it to yourself,
i tried to do the experiment, but it simply wont work because when i put the ruler off-centered to the right the ruler keep falling. however, i tried to do it when the ruler is centered, and the result is that the ruler doesnt move anywhere if i rotate both of the wheels with same speed. which means that the ruler stays on the same spot, but again it's not the answer.


Register to reply

Related Discussions
Group theory - triangle rotation matrix problem? probably simple? Advanced Physics Homework 5
Set theory proof - counter examples Set Theory, Logic, Probability, Statistics 3
Geiger counter, ionization counter with a gain of unity Advanced Physics Homework 0
Counter to string theory Beyond the Standard Model 3
Can anyone tell me why this counter string theory is wrong Beyond the Standard Model 1