Why don't ghosts swing their arm while 'walking'

Have you ever wondered why ghosts are depicted to be motionless while 'moving' around. Note the '' '' here which I will explain later as well. Some would probably say that this is just something scriptwriters and movie directors came up with to differentiate real living people from those dead ones. But if you think about it from the scientific aspects, it actually make some sense.

There are actually 2 problems here... 1) Why don't they swing their arms? 2) Do they even walk?

The only way for someone to travel from place to place without any mechanical aid(eg. skateboard, roller blades, etc) is to walk. We all agree that right? Then again, we don't really classify them as people, but let's assume they are for now. So why don't they swing their arms like us? Scientifically it is accurate, let me show you. Firstly, we don't assume ghosts have any weight, isn't it? They can float and do other funny stuff so let's assume they are weightless, or rather mass-less. But what makes people swing their arms is actually due to the moment generated by our legs as we walk, so to counter this moment, our arms swing or else we will be turning as we walk and can never reach our destination. To generate moment, we need a force and a perpendicular distance from the force to the pivot(from one leg to the other).

Then we go back to our 2nd question, do they ghosts really walk?? Let's first assume they do, so with each step they generate a moment and so on... but wait, they were mass-less, right? So by Newton's 2nd law, F = ma, they cannot generate any force so no moment and no counter-moment from the arms. Question 1, check!

Then we go back to our first assumption that they walk, so now we assume they don't, if you watched enough movies they actually float around since they can defy gravity with their lack of mass(sometimes they crawl too, think THE RING). So they move, but their arms still don't swing, why? Remember I said the swing of arm is due to the moment from the movement of the legs, so since their legs don't move, why the hell you get that moment you need to swing those arms??

Then back to Qn 2, do they walk? We need to go back to Newton's 2nd law to explain this. If you paid enough attention in your physics class in secondary school, you should know you need a force to move, since ghosts are mass-less, they generate no force and thus they cannot walk. Therefore the notion that they float is more accurate than say Sadako crawling out of the TV.
Question 2, check!

**Explaining the Paranormal with Science is proudly brought to you by LAMESHIT School of Thought, any truth is purely coincidental**

Hope you guys managed to de-stress in this exam period!

PS: LAMESHIT School of Thought is looking for more myths and legends that need explaining with science.

Bonus Qn : 用什么抹窗最干净?? Answer will be out with the next post.

Eee PC

Easy to Learn, Work and Play
Excellent Internet Experience
Excellent Mobile Computing Experience

These 3 phrases describes the EEE of the Asus sub-laptop which I saw someone in NUS carrying. At 7", weighing 920g, looking like your MacBook in its pure white chassis, this is one darn cool laptop. It should be noted that they do not contain any optical drives for storage, instead uses the same technology as your thumbdrive in data storage. This results in the smaller than normal size while boasting a cooler machine and faster startup. For those who are interested the 4gb version carries a S$598 tag with the 8gb going to hit S'pore shores real soon(maybe it alr did).

For more information, click here.

The Answers

Well, since the test do not display the answers, I shall do the honour of revealing the answers since I'm stuck in the computer lab in YIH.

1) My real name is of course Changxiong, no space in between but sadly most people add a space to it and the banks don't even care if there's a space.

2) If you know me after JC, you shall be forgiven... Swimming is the answer, it dominated my life from sec 1 way over JC.

3) If you have read the blog, you would know that I've done diving way back in 2005.

4) Watermelon has been my favourite since young, cos its juicy, sweet and you can get seedless ones!

5) Unlike most guys I'm not interested in soccer, golf is too boring, tennis is not commonly on Ch 5... they used to have F1 on TV back in my secondary school days and I have a Ferrari flag at home, courtesy of Jon.

6) Living in Tampines my whole life, commuting to NUS is really punishing sometimes. No bonus to knowing why I chose NUS over NTU. I shall forgive those who thinks Tampines is in the West as well ;)

7) Again the answer can be found on the blog. Munich will play host to me next year.

8) If you have been reading this blog, this should not be too hard either. Since I've compared Xiao Long Bao from Imperial Treasure, Crystal Jade, Ding Tai Feng and some other places.

9) Boring CX will definitely be in the most boring faculty in NUS. ENGINEERING of cos. Indulging myself with Fluids Mechanics, Nyquist Stability Criterion and if Newton is alive, I would salute him since he actually came out with his laws just by looking at an apple falling from a tree, I think.

10) I would say this, along with the fruit question should be the hardest. I think I mentioned Prison Break and Ghost Whisperer before and I finished the whole of season I and II of Heroes. Desperate Housewives are just beyond me in terms of content and time(I'm always busy at 10pm).