Comments on: Kinematics – This Is E-Maths Not A-Maths! http://www.exampaper.com.sg/questions/e-maths/kinematics-this-is-e-maths-not-a-maths Sassy O Level Maths Tuition, Questions & Tips from Singapore's Favourite Private Tutor Sun, 05 Feb 2012 17:08:39 +0000 hourly 1 By: Nash http://www.exampaper.com.sg/questions/e-maths/kinematics-this-is-e-maths-not-a-maths#comment-30777 Nash Mon, 12 Oct 2009 13:47:24 +0000 http://www.exampaper.com.sg/questions/e-maths/kinematics-this-is-e-maths-not-a-maths#comment-30777 At a levels.. this is about all the info you get and its a physics mcq question...So the information is sufficient actually. ^_^ Moral of the story, If u cant handle this,don't choose A levels go poly! Trust me its not worth the tears of blood shed X_X. At a levels.. this is about all the info you get and its a physics mcq question...So the information is sufficient actually. ^_^

Moral of the story, If u cant handle this,don't choose A levels go poly! Trust me its not worth the tears of blood shed X_X.

]]> By: Joanne http://www.exampaper.com.sg/questions/e-maths/kinematics-this-is-e-maths-not-a-maths#comment-30771 Joanne Mon, 12 Oct 2009 07:43:41 +0000 http://www.exampaper.com.sg/questions/e-maths/kinematics-this-is-e-maths-not-a-maths#comment-30771 i think that the information given is not enough T.T i think that the information given is not enough T.T

]]> By: Miss Loi http://www.exampaper.com.sg/questions/e-maths/kinematics-this-is-e-maths-not-a-maths#comment-431 Miss Loi Tue, 10 Jul 2007 16:53:38 +0000 http://www.exampaper.com.sg/questions/e-maths/kinematics-this-is-e-maths-not-a-maths#comment-431 Great work Ms Lala! Can Miss Loi assume that you mental calculations were done with the help of the graph? Next time don't forget to write down your working (even though Miss Loi knows they're all on your head!). So to complete your answers with some explanations: 1. In a speed/time graph, the distance covered in 10 sec will be the area under the graph bounded by 0 ≤ <var>t</var> ≤ 10, which is the area of a trapezium (see shaded portion below). <img src="http://www.exampaper.com.sg/blog/wp-content/uploads/2007/07/kinematics-emaths-answer-0.jpg" alt="Answer 1" /> Hence solve for: (1/2)(2 + <var>u</var>)(10) = 60 Hope students still remember the formula to find the area of a trapezium! 2. Let the speed be <var>x</var> at 16 seconds. If you draw some lines on the relevant coordinates, you'll actually come face to face with two similar triangles (see the shaded portion below): <img src="http://www.exampaper.com.sg/blog/wp-content/uploads/2007/07/kinematics-emaths-answer-1.jpg" alt="Answer 2" /> Hence solve for <var>x</var>: (10-<var>x</var>)/<var>x</var> = 1/14 3. Hope Miss Loi's sketching skills are good enough to illustrate your 'descriptive' answers for clarity: <img src="http://www.exampaper.com.sg/blog/wp-content/uploads/2007/07/kinematics-emaths-answers-2.jpg" alt="Answer 3" /> As mentioned in the main entry, students really, really need to understand the concepts of gradients in different graphs. Also remember to label all points on the axes (i.e. distance) else marks might be lost! Great work Ms Lala! Can Miss Loi assume that you mental calculations were done with the help of the graph?

Next time don't forget to write down your working (even though Miss Loi knows they're all on your head!).

So to complete your answers with some explanations:

1. In a speed/time graph, the distance covered in 10 sec will be the area under the graph bounded by 0 ≤ t ≤ 10, which is the area of a trapezium (see shaded portion below).

Answer 1

Hence solve for:
(1/2)(2 + u)(10) = 60

Hope students still remember the formula to find the area of a trapezium!

2. Let the speed be x at 16 seconds. If you draw some lines on the relevant coordinates, you'll actually come face to face with two similar triangles (see the shaded portion below):

Answer 2

Hence solve for x:
(10-x)/x = 1/14

3. Hope Miss Loi's sketching skills are good enough to illustrate your 'descriptive' answers for clarity:

Answer 3

As mentioned in the main entry, students really, really need to understand the concepts of gradients in different graphs.

Also remember to label all points on the axes (i.e. distance) else marks might be lost!

]]> By: Ms Lala http://www.exampaper.com.sg/questions/e-maths/kinematics-this-is-e-maths-not-a-maths#comment-426 Ms Lala Mon, 09 Jul 2007 16:39:46 +0000 http://www.exampaper.com.sg/questions/e-maths/kinematics-this-is-e-maths-not-a-maths#comment-426 1. u = 10 m/s 2. 9 and 1/3 m/s 3a. starting from zero, a curved line with an increasing slope, followed by a straight line with constant slope, then lastly a curved line with a decreasing slope. 3b. horizontal line at a=0.8, followed by horizontal line at a=0, lastly horizontal line at a= -2/3 hopefully my mental calculations aren't too hopelessly wrong. 1. u = 10 m/s
2. 9 and 1/3 m/s
3a. starting from zero, a curved line with an increasing slope, followed by a straight line with constant slope, then lastly a curved line with a decreasing slope.
3b. horizontal line at a=0.8, followed by horizontal line at a=0, lastly horizontal line at a= -2/3

hopefully my mental calculations aren't too hopelessly wrong.

]]> By: Miss Loi http://www.exampaper.com.sg/questions/e-maths/kinematics-this-is-e-maths-not-a-maths#comment-425 Miss Loi Mon, 09 Jul 2007 16:37:07 +0000 http://www.exampaper.com.sg/questions/e-maths/kinematics-this-is-e-maths-not-a-maths#comment-425 winston ... ummm ... don't think you're lucky this time. Read the <span class="highlight">red text</span> dude! winston ... ummm ... don't think you're lucky this time. Read the red text dude!

]]> By: winston http://www.exampaper.com.sg/questions/e-maths/kinematics-this-is-e-maths-not-a-maths#comment-423 winston Mon, 09 Jul 2007 11:10:57 +0000 http://www.exampaper.com.sg/questions/e-maths/kinematics-this-is-e-maths-not-a-maths#comment-423 1st answer is 4. 2nd one if i am lucky is 4 - 1/16 = 64/16 - 1/16= 63/16 = 3 15/16! i dont know the rest :P how are you going to release ans? (i'm one of the few who don't take amaths.geez..) 1st answer is 4.
2nd one if i am lucky is 4 - 1/16 = 64/16 - 1/16= 63/16 = 3 15/16!

i dont know the rest :P how are you going to release ans?
(i'm one of the few who don't take amaths.geez..)

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