SPM Questions: Motors & Generators

As i mentioned before, to understand application of each physics subtopic is vital. Usually in SPM they'll ask u about this in section B & C , paper 2.
For example, let us analyse an SPM question taken from year 2006 about motors.
But as usual, those who created the question loved to confuse the students.

Take a look at the diagram below.
Lets discuss the 1st part..the question asked them
i. explain how AC motor can rotate

If we analyse the diagram, they gave a labeled diagram for an AC motor. If u notice, we hardly find notes on reference book or textbook about AC motor. (try & find it)But we have been given in details about the structure of AC generators. If the student tend to simply memorize, they might had been described the AC generator working principle instead of AC motors. I would advice in this case for u to underline the word motor as to make u alert of things that being asked.

Basically to answer the 1st part, u just simply describe details of the turning effect in dc motor and mention what happen if the current changed in direction from the AC supply. U can draw diagram to help u describing the principle.

Now on the 2ndpart:
The question asked the student to modify the device into DC motor & make it rotate faster.
Again.. i strongly advice u underline these words, "DC motor & rotate faster". So in your answer you must give points on both cases.
-First, u need to explain how u are going to convert it into DC motor
..here comes the importance of revising the application of each subtopic. If u never read about motors, u are having difficulties answering this question.
Moreover in this case they combine some concept in Electronics to change the AC to DC.

-Then, give points on how to make it rotate faster.... I'm not gonna give u the answer for this, coz u can find it in your reference book or cerdik's passed year's book. So apa tunggu lagi, bukak lah buku..pegi baca ;)

What i'm trying to emphasize here is, please dont take for granted of any applications in each subtopic. In this case, u really need to identify the differences between AC-DC motors &
AC-DC generators.
But dont simply memorize them, understand how they work.
Who knows, it might come out in your trial..








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SPM tips: "An essay a day keeps lower grades away"

Hi guys..

Sorry for keeping some of u waiting for my new post especially in this xm week.My internet connection had problems but it has already fixed by someone. Anyway if u've made an early preparation u wont be panicking like this.The common problem with all of u is having a last minute study .If u dare to repeat this habit again then be prepared of ....
the worst SPM tsunami's effect :)

It seems that xm week is almost finished which mean u r only a few days b4 your school holiday..then lepas tu boleh ENJOY :)!Or may b some of u have already relaxed coz xm dah habis. Nevermind, tis weeken u can go & take some rest..but not too long kay ;)

As for today i'm in a good mood & wanna share with u some simple tips..
Recently i came aross a quote saying "An apple a day keeps the doctor away"
Suddenly i found it applicable to my tips sharing series..after a few minutes brainstorming i decided to name this PHysics' tips as:
"An essay a day keeps your lower grades away"

YES..u must at least do one physics esssay type of questions from any physics topic everyday.May be u can do some proper planning, start with form4 topics first. Go find an exercise books if u dont have one right now. While i'm writing this,the countdown display counted that u have a remaining 175 days, 23 hous, 05 min, 48 sec.
Just imagine if everyday u are doing 1 essay question, that means u've practised at least 170 questions of section B & C before SPM exam. If u stuck dont take too long..take a reference book & find the answer. Then look at the provided answer scheme..do comparison with your own. After that do correction,rewrite them & read it .Finally & most impotantly ..try to understand & memorize them if necessary. For my form 4 student, if u r reading this article & apply it straight away..i'm sure u 'll be better equipped in next SPM than this year candidadate ;)

The same method also can be applied if u r weak in paper 3 , then do at least 1 question from paper 3 everyday. If u consistently doing this, i'm sure u are ready to move towards another bigger step..which is to go all out in the real battle & shoot for an 'A'.
As people said, thousands steps start from a humble single step..
So what r u waiting for..here i am giving u another sets of question. Download them & do it today even though u've finished your "SPM junior" exam ;) .

SPM Physics Time Series 2008 Questions
Answer scheme