How do disc brakes work?

Okay folks, here's my new entry to my blog....with a new question.Today i was  watching a pulsar 220..really cool bike. But wait what do u see in its brakes?Yeah i know that those are disc brakes..but wait..why are there holes in it?If there are holes in it..then why don'nt we call it fix brake?These all questions..paved the way for me to search for it..nd here iam....and really lot of people think that disc brakes actually work on the principle that some sort of drill fits in it ..nd the bike stops!!!NOOOOO!!!!!!!!!
Actually, disc brakes  work on the principle of friction.It mainly has three components:

1. THE DISC:Its actually the rotating wheel on which a tyre is fitted and where the action of brakes apply.As a lot of heat is generated while braking, the disc has to be made of only solid cast iron or ceramics in superfast cars.And now the holes, actually the holes that u see in the pulsar or the RTR are actually meant to minimise the action of heat and increase action of braking.Thus they are called VENTILATED DICS and NOT FOR BRAKING PURPOSE!!!

 

      2. THE CALIPER: The caliper is nothing but the box like thing you see on the brake. It has pistons, that do the action of braking. So when you brake, u actually convert the kinetic energy of your car to heat energy.They do this hydraulically(or in some cases-electromagnetically).

 

    

        3.THE BRAKE PADS: The brake pads are actually designed for high friction.Another misconception among people is that brake pads come in contact with the disc.....but NOOO!!!But they actually generate semi liquid friction boundary..which actually provides and comes in contact with the disc while braking.

Well here's a small video..but for this- QUITE AMAZING!!!!

Why do mosquitoes bite?

Let us answer a new question....What makes mosquitoes bite u????Well, If u ask me...this question was also asked in my school...(school ques..are turning out to be a good source to me for new posts!!).To be frank..a good friend of mine answered this question quite correctly.Actually mosquitoes feed on plant nectar, fruit juices..anything liquid which sources from a plant. But what makes them feed on blood is that they belong to a group of arthropods(a group of species that have jointed legs) that need blood to fertilise it's eggs in it's stomach.Since male mosquitoes do not lay eggs..thats why they dont bite too!!also our blood contains proteins ..so to lay eggs it really needs protein..which get's fulfilled by the human blood. 
And probably u would ask..what causes the mosquito bite to irritate u?Well, look upfor my next post!!nd for this -QUITE AMAZING!!!!!

What causes the earth to rotate?

Our planet earth moves one degree..anticlockwise..every 4 minutes..... a simple question what causes the earth to ROTATE?Iam not copying and pasting this out simply through internet...this question came to my mind and i lost em anyhow..but recollected lastnight..and started asking everyone..also..obviously the internet!!!so lets begin.

The cause of rotation dates back to the day when earth was born, maybe due to a big collision, or the other way....but it simply caused the earth to rotate. Now here comes ANGULAR MOMENTUM. In physics they say that in space there is NO ATMOSPHERE..therefore no force...so basically without any force..there will be no change in earth's rotation(principle of ANGULAR MOMENTUM).thus our earth rotates from the day it was born!!!QUITE AMAZING!!!

Why do or how do we get hiccups?

Now, soon after my last post...i ate a lot of achar....now suddenly..a min after igot hiccups....i was happy ..happy bcoz..i got the idea for mah nxt post!!!now hiccuping is as complex as solving rubikscube//!!
but i'll make it simpler...

First of all..hiccups are nothing but bursts of breathing in...called inspiration.Now sometimes due to too much eating or eating food quickly causes the stomach to distend and irritate DIAPHRAGM(see the pic above)...now this causes an involuntary inspiration..or hiccups..also ..hiccups can also come due to some change in nerve pathways to brain..which is why..sudden emotional change brings in hiccups..!!QUITE AMAZING!!

Why do we cry while cutting onions?

hmm....a good question...this question striked me when(i don't know maybe month ago) mah bio teacher(bharat trivedi) asked us what makes u cr while cutting onions?okay..i had no idea..neither mah frnds had..bt he told me that onion contains some sulphur content in it..when it comes in contact with our eyes..it makes a very dilute sulphuric acid..nd thus our eyes get irritated...
now searching on the internet for getting deeper into dis..i got to knw that while u cut an onion..it releases a gas called Propanethiol S-oxide(wow!!). now this gas..gets mixed wid other enzymes to release sulphur gases..and gets into our eyes to create dilute sulphuric acid...ND WE CRY!!!!QUITE AMAZING!!!

What is the spider silk made up of?

Basically, i got this question in mah mind...nd asked mah teacher about this.nd he said that it is simply made up of  PROTEINS.Indeed, spider's silk or the thread that makes the spider web is made up of long chains of  amino acids...they are made of two amino acids.-GLYCINE and ALANINE.

Spidersilk is extremely strong and anot FIVE TIMES STRONG AS STEEL!!!! AND CAN STRECH ABOUT 20% MORE THAN ITS ORIGINAL STATE!!!QUITE AMAZING!!!!!