The Lee-Tseung Lead Out Theory

[ltseung888]

As soon as Tseung started arguing that the string tension somehow "does work", even though it does not compress or shorten in any way, I think it is pretty clear that he is utterly delusional. 

Dear utilitarian,

After so many posts and so much puzzling over why many forum members could not follow the simple secondary school physics, you helped to point out the exact point of disagreement. 

The string tension somehow "does work", even though it does not compress or shorten in any way.,

I do not mind labeled as ?utterly delusional? because the Physics is 100% correct. 

The Physics and mathematics cannot be wrong.  When there is tension in the string due to the bob and a side way pull, there is work done (from old position to new position). 

No physicist or physics student could possibly deny the experimental observation that the pendulum bob will be displaced sideways and upwards.  Work must have been done.  Energy must have stored.

Let us review the Physics Textbooks, Consult the top Physics Professors or do any suitable experiments.  It is important to confirm the following Physics Statements:

(1)   The tension in the string can be resolved into vertical and horizontal components.
(2)   The vertical component is equal and opposite to the weight at equilibrium
(3)   The horizontal component is equal and opposite to the supplied horizontal force at equilibrium
(4)   There is vertical and horizontal displacement.
(5)   There must have been work done when the bob is displaced upwards and sideways.
(6)   Work done = Force x Displacement (vector arithmetic)
(7)   The vertical work done by the string is positive.
(8 )   The horizontal work done by the string is negative

Can any of the above Physics Statements be wrong?

Scientific truth is not delusional.

[ltseung888]

I should really thank utilitarian for highlighting the disagreement point.

After so many posts and comments, I never realize the main problem of the forum members.

At both the Tsingjua and Shenzhen Seminars and Dry Runs, that particular question was never raised.

I thought that it was obvious.  Apparently it is not - at least to utilitarian and may be to some forum members.

[ltseung888]

In actual seminars, I can find out questions directly.  If I were not sure what they really asked, I could communicate directly.

In Internet Forums, I do not have that luxury. 

So please state your question concisely.  Please raise one question per post.  If I do not understand your question, I shall ask for clarification.

At this point, I shall only answer questions related to Slides 10-12.  All other questions will be deferred.

[ltseung888]

In slides 10-12, the focus is on the analysis of the first Lee-Tseung Pull on the simple pendulum.

If one does not understand or agree with the analysis of this first Lee-Tseung Pull, there is no point in further discussion.  That is the reality of Physics and Mathematics.

Thus, I shall not proceed with more discussions on other slides until a large enough number of members show that they understand these slides.

Please indicate that you understand (or just accept) the analysis if you want discussions on other slides.

[tinu]

I have put the video describing the experiment from Mr. T S Cheung on youtube.
The first one has the ball hitting hard surfaces at both ends. The time of rotation was 2 minutes 35 seconds. The following link shows that video.
http://www.youtube.com/watch?v=V1P3TGhJiF0
The second one has the ball hitting hard surfaces at one end and soft surfaces at the other. The time of rotation was 4 minutes 55 seconds. The following link shows that video.
http://www.youtube.com/watch?v=zykButGc22U&feature=related

You should do a run with tubes attached but the balls fixed in place so they cannot move at all.  That would be a proper control, which all scientific experiments should have.

I second that.