Today i'm gonna share with u tips on avoiding mistakes while doing calculation type of question.
Common habit among student once they attempt calculative questions, they simply grab a calculator & start to press the button like playing PSP. They don't bother to highlight or jot down anything. This habit can cause u to do careless mistakes, especially if u forgot to change its figure into SI unit.
So for this purpose, i'm sharing u a technique that can minimise your mistakes.
This technique is called LESS..i.e u need to carry out these 4 steps;
1. List down and highlight all the information or figures given( check its unit as well)
2. Equation = choose the right equation/formulae
3. Substitute the figure into the relevant equation
4. Solve the equation..then baru press your calculator :)
For example:
A car traveling with a velocity of 10 m s-1 accelerates uniformly at a rate of 3 m s-2 for 20 s. Calculate the displacement of the car.
1.list down the information: u=10 , a=3, t =20
2. Choose the equation.. (v2 = u2 + 2as) or (s = ut + ½ at2)...
you are not provided with v, thus most suitable is (s = ut + ½ at2)
Then substitute and solve the equation
s= 10(20) + (1/2 x 3 x 20x20)
= 800m
If u apply LESS technique step by step.., i'm sure u'll grab MORE marks :)
just enjoy your revision during this festive season :)
September 13, 2011 at 11:42 AM
nice one cikgu fizik..however,ramai juga student skang ni ase nak cepat je jwb, langkah 1 dah skip...hahaha...
September 20, 2011 at 12:07 AM
thnx master yoda, hrp dpt membntu stdnt2 kita ni
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