SPM Physics

If u watch the above video, some people in this world were having fun without realizing that they should be grateful to a well known French scientist named Pascal. Without his discovery theirs life will not be exciting enough.This jumping car is actually applying his principle `that being widely used in a hydraulic or pneumatic system. I'm not gonna discuss how the car can jump, but i will discuss about the fundamental principle used which allows the car having this 'hip hop' movement.
Ok..lets get back to our SPM discussion on another important physics principle i.e the PASCAL's Principle.
As usual, in every physics principle, u must be able to state the principle itself...
So what is Pascal Principle????

Pascal principle states that:
Pressure appllied in a confined liquid is transmitted uniformly in all direction through out the liquid.

..to those who dontt undrstand the word 'confined liquid', take out a dictionary & apply its meaning in the context of this principle. Basically in B.M it means.."cecair yang berada dalam bekas tertutup".

So if the liquid is trapped in a container and pressure is applied, according to the principle; this pressure will be transmitted equally in all direction.

If u watch above diagram..according to pascal principle, all the water that moves out from the holes received the same pressure.

Now lets analyse this interesting activities carried out among some students in this video.....from the video,can u explain why the glass breaks at the bottom part of the bottle???



Pascal principle is widely used in a hydraulic system. In SPM its a must for u to fully understand the application of a hydrauick jack, hydraulic brake & etc. There's some simple calculation involved.
Watch this!!



Usually the input piston has smaller area..bcoz when area decrease the pressure applied will be multiplied even if u press it with a smaller force. So this huge pressure will be transmitted equally to the output piston. Thus a bigger output force is produced at the larger piston.This explains the reason why the boy who is standing on the input piston can lift up the car.

How to derive it;s mathematics relationship ??
Ok..first u must notice that ..
Presure applied in input piston = Pressure transmitted to output piston
                                       P 1 = P 2
Thus,                          F1 /A1 = F2 /A2              

(Referring to the video, the boy's weight represents the F1)              

Another important physics principle that we learned in SPM is Principle of Conservation of Energy. In form 4 we've learned about these following energy;

Another important physics principle in SPM is Bernouli principle. For those who hates doin physics' calculation, Bernoulli will be a gud news for u coz no formula is involved at this stage. However u really need to grab a genuine understanding on its concept.

Ok..what is Bernoulli Principle ??

In simple words Mr Bernoulli stated that..
"if the velocity of fluid increase, the pressure decrease"...

Bernoulli is one of the fascinating physics principle & yet it's easy to understand..it relates the effect of fluid velocity on pressure.
..if u notice, the term fluid is used just like in Archimedes..
just to remind those yg dah lupa, fluid means 'benda mengalir' i.e it can either be air (gas)or liquid.

Common mistakes among students, they always think that pressure causes the increase in velocity. In fact it is the movement of air or liquid velocity that causes the change in pressure.

Here some cool & interesting lectures which i collected from the net. If u understand nothing on bernoulli,you must watch these videos to clear the air :)




Besides knownig the principle, in exam u must be able to apply and explain the bernoulli effect on venturi tube, floating ball, water sprayer, aerofoil etc.
Lets analyse the video about water sprayer below..can u explain why the water rises ??


Another interesting facts about bernoulli, it allows an aeroplane gain its lift force from the wing's aerofoil shape. If u intersted to further study in aerospace or aeronautical engineering, u need to fully understand the working principle of an aerofoil.
Look at this video..even this cute little girl can explain the aerofoil concept.. i think u should be ashamed of yourself if u r still too lazy to think about it ;)



To understand what causes different water level in venturi tube is also important aspect in bernouli principle. It always being asked in the exam. U need to fully understand & be able to explain the change in water level.
Who knows it might come out in this year SPM...so apa tunggu lagi, get your book & revise them now!!! :)

Learning the application part of each physics principle is a must in SPM. You must know the working priciple of each application. For example in archimedes principle, you should know how submarine can float & sink. Then u must be  able to explain it by using relevant physics concept. This kind of question will always being asked in paper 2.