Ai Tong Sch 2009 P6 CA1 Math Paper 2 Q2

Each skirt costs $m and 3 blouses cost $62.50. Find the cost of 2 skirts and 6 blouses.

Solution

Skirt --> $m

2 skirts --> 2 x $m = $2m

3 blouses --> $62.50

6 blouses --> 2 x $62.50 = $125

Total --> $2m + $125m

= $(2m + 125) (Answer)

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Ai Tong Sch 2009 P6 CA1 Math Paper 2 Q1

Express the perimeter of the figure below in terms of t.

Solution

Perimeter

--> (6 + t + 5 + 7 +11 + 7 + t) cm

= (2t + 36) cm (Answer)

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New Discussion Board

Please note that we have opened a new Discussion Board for those who wish to make long posts on questions and/or solutions to PSLE topics.

The address of the Discussion Board is
http://atfreeforum.com/excel

The chatbox is still operational for those who wish to make short comments.

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Excel Eduservice

Improve Your Thinking Skills in Maths

The first set in the series, "Improve Your Thinking Skills in Maths" (Primary 3) which I wrote, has been released by Singapore's biggest publisher of school textbooks, Educational Publishing House (EPH). The other 2 series, which I also wrote (Primary 1 and 2), will be out soon.

The above series can be purchased at Popular outlets.

Regards

Officer Cadet School (OCS)

Our son completed his OCS on 19 Dec 09 and was commissioned an officer in the SAF.









Related News
More than 500 SAF cadets commissioned as officers

SINGAPORE: More than 500 officer cadets were commissioned as officers at the SAFTI Military Institute on Saturday evening.

Deputy Prime Minister and Minister for Defence Teo Chee Hean reviewed the commissioning parade for 402 Army, 52 Navy and 50 Air Force officer cadets.

The parade marked the completion of 38 weeks of rigorous training, during which the officer cadets were put through realistic training scenarios to develop their combat, planning and leadership skills.

The newly commissioned SAF officers will assume operational, instructional or staff appointments.

Addressing the graduands at the parade, Mr Teo encouraged them to take responsibility of the training, morale and discipline of their men to ensure that they were operationally ready at all times.

"As their commander, make good soldiers out of them... win over the hearts and minds of your men, for it is the resilience and fighting spirit of our people that will ultimately make the difference," said Mr Teo.

Education Minister and Second Minister for Defence Ng Eng Hen, Members of Parliament, senior Ministry of Defence officials and SAF officers, as well as families and friends of the newly commissioned officers also attended the parade.

- CNA/so

Nobody Video Clip

Now that PSLE is over, it's time for some light entertainment.

A funny video clip about mom's advice that you should always check what you need before doing things. That aside, it is a popular video clip judging by the ratings it scored and the number of views it recorded.

Nobody But You Full Music Video - Wonder Girls (HQ)

PSLE results to be released on Thursday

From Channel News Asia

PSLE results to be released on Thursday
Posted: 23 November 2009 1215 hrs

SINGAPORE: The Primary School Leaving Examination (PSLE) results will be out on Thursday.

Pupils can get their result slips from their schools from noon on November 26. Eligible pupils will also receive their option forms to select their secondary schools.

With the PIN contained in the sealed option form, parents can submit their child's secondary school options online via the Secondary One Internet System.

The system is accessible 24 hours a day through the MOE Secondary One Posting website, starting from noon on Thursday. Application closes at 3pm on December 2.

Alternatively, parents may also submit their child's secondary school options through their child's primary school.

The Secondary One posting results will be released on Tuesday, December 22. Pupils are to report to their secondary schools on Wednesday, December 23, at 8.30am.


- CNA/so

Tuition Classes for Academic Year 2010

Please note that we will start our new tuition classes for the Academic Year 2010 on 14 Nov 2009.

Our contact details can be found in this link.

Simple Machines - The Movable Pulley

This article was first published on 3 Sep 2008.

One of the functions of simple machines is to lighten our workload. A small effort can move a greater load. What is sacrificed is that the distance moved by the effort is greater than the distance moved by the load.

As an example, we will take a look at the movable pulley. So how does a movable pulley help to lighten our work?

Remember that in order to be able to move a load that is greater than the effort, the distance moved by the effort has to be greater than the distance moved by the load.



With reference to the diagram above:-

Pulley A - The distance from the pulley to the ceiling is 2m. This means that the cable attached to the pulley is also 2m.

Pulley B – The distance moved by the effort is 2 m. However, the load moves only 1 m from the original position of the pulley. This is confirmed by …. 2-m cable divided by 2 = 1m, which means that the distance from the pulley to the ceiling is 1m. Hence, the distance from the pulley now, is 1 m from where it was originally.

Since the effort moved twice the distance moved by the load, only ½ the effort is needed to raise the load. Hence if the load weighs 10 kg, an effort of slightly over 5 kg only is needed to move the load.

Simple Machines – The Inclined Plane

This article was originally published in Oct 2008.

As with all machines, if we want the force exerted by the effort to be less than the force exerted by the load, the distance travelled by the effort has to be more than the distance travelled by the load.

Below are 4 illustrations how the inclined plane works.



The more gradual the slope, the greater the distance travelled by the effort compared to the distance travelled by the load. This means that the more gradual the slope, the less effort is needed to move the load.

Examples of applications of the ramp in real life – wheelchair ramps for the disabled, gradual and winding slopes of a road found in mountainous terrain (e.g. roads to Gentling Highlands or Cameron Highlands).



It can be noted that the ‘sharper’ the wedge, the less the effort is needed because for the same distance travelled by the effort, the distance moved by the load is now less.

Examples of applications of the wedge in real life – axe head, blades of knives, metal wedges for prying open flanges of pipes in heavy industries.



Fig 1 - For every 1 turn the screw makes, the screw is driven down by the distance of ‘1 pitch’. Hence, the more gradual the slope of the thread, the smaller the distance it will be between 2 threads, as shown in Fig 2.

Fig 2 - the distance travelled by the load is less than in Fig 1, although in both cases, the effort moves by the same one turn. Since the load moves less in Fig 2, less effort is also needed.

In conclusion, for screws, the more the number of threads there is, OR the smaller the pitch, OR the more gradual the slope of the threads, the less the effort is needed to move the load.



Again, like the screw, the smaller the pitch, the less the ends of the ‘V’ move towards each other, which also means the less the distance the load moves.

Like the screw, for the screw jack, the more the number of threads there is, OR the smaller the pitch, OR the more gradual the slope of the threads, the less effort is needed to move the load.

Take note that for the screw jack, while the mechanism of the inclined plane is used to lift the vehicle off the ground, the handle of the screw jack works on the principle of the wheel and axle. In this case, the handle is the wheel, while the screw of the jack (the part with the threads) is the axle.


Important note to parents and students – The purpose of the above 4 illustrations is to help students understand the mechanics of the inclined plane. Most schools’ practice papers and science textbooks do not use the terms ‘pitch’ or ‘threads’. Those terms are technical terms used in the heavy and light industries.

In trying to make the illustration as simple as possible, I have found that I cannot avoid using those technical terms. The use of the above terms is to assist the student (or parent) to understand the mechanics of screws and screw jacks.

Take note that markers who will be marking your Science PSLE Paper, in all likelihood have been teachers all their lives and may not have worked in industries before, and would probably not be familiar with the terms ‘pitch’ and ‘threads’.

In other words, it is highly advised that you do not use the terms ‘pitch’ and ‘threads’, unless you are able to draw and label the diagrams as accurately as the above.