2023 PSLE Discussions and Strategies (Children born in 2011)

[koudayao27]

Elson\" post_id=\"2120039\" time=\"1696422350\" user_id=\"136390:

Just chipped in for discussion purpose since I am not exactly sure how the question was phrased. I tend to think (2) is incorrect because according to newton’s law, F=Ma, where a is the acceleration and is constant, so be it heavy or light object. They will fall down at same speed. Just my guess. 😜 I think my gal did wrong too.

Yeah, Newton is certainly correct.
However, the question didn't mention the relationship between velocity and mass. Regardless of the mass, the reason the basketball slows down is due to gravity.

[koudayao27]

mershel13\" post_id=\"2120032\" time=\"1696411865\" user_id=\"60253:

Hmm…but if the metal piece is directly above the flame, wouldn’t it be too hot for it to touch? Then how does it serve its purpose as a handle? Do u mean it’s an open lantern? From some of the kids’ drawings, it seems to be a closed lantern. And it’s possible for the top part of the paper lantern to be burnt due to its close proximity to the flame.

I haven't seen the original picture either, but you're right, the metal directly above the flame would definitely be very hot.

Perhaps that lantern was designed to hang somewhere for decoration, and nobody is supposed to touch it

https://encrypted-tbn2.gstatic.com/images?q=tbn:ANd9GcR9P-w5D2Aw7qSXeJSq4OeqSh-WhX2oYWYUydvE7gX7ASF_J5kV\">

[insanity_in]

koudayao27\" post_id=\"2120042\" time=\"1696425307\" user_id=\"199369:

Yeah, Newton is certainly correct.
However, the question didn't mention the relationship between velocity and mass. Regardless of the mass, the reason the basketball slows down is due to gravity.

agreed. gravitational force is dependant only on mass and not weight.

[passioninlearning]

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[Blokus]

koudayao27\" post_id=\"2120028\" time=\"1696405821\" user_id=\"199369:

This question asks you to choose the incorrect option, and 1) is that incorrect one.

As the ball leaves the spring and rises, there is no longer any push force acting on it. so its subsequent falling is not due to the push force being used up.

Thanks for your explanation.

May I know if the concept behind this question is within the primary school science syllabus? Basically they were taught what force is, effects of force, what is weight, the type of forces etc. Is this concept within what is taught in primary level? Pardon my ignorance, My secondary school kid used what he learnt in upper level physics to explain this answer, which then Made me wonder.

[Pumpkin2022]

insanity_in\" post_id=\"2119966\" time=\"1696337677\" user_id=\"202715:

For the lantern question, there is a metal wire. My boy said the answer is metal is a good conductor of heat… So not sure here whats the actual question. He is also a AL1 student for Science..

My girl said the answer is 1 , air is poor conductor of heat as she felt the air outside the lantern was a poor conductor of heat and not fast enough to take away the heat . She is also a AL 1 student for Science all the way since p4😂😂

[Pumpkin2022]

And also the air outside the paper is a poor conductor of heat. That s why the hear accumulates in the paper couldn’t be dissipated fast enough to keep the temperature lower than the ignition point.

koudayao27\" post_id=\"2120004\" time=\"1696384984\" user_id=\"199369:

The heat from the candle flame is transferred to the paper through the metal. Metal is a good conductor, while paper is a poor conductor, so heat accumulates in the paper, ultimately causing the paper to catch fire.

So, the correct answer should include both:

- Metal is a good conductor.
- Paper is a poor conductor.
Either option alone is incomplete.

This exam question seems to be flawed.

[00skyblue00]

ChiefKiasu\" post_id=\"2120005\" time=\"1696385939\" user_id=\"3:

I agree... the exam is over, and nothing we can do now can \"improve\" our standing
Since we don't have the exact question of what is being asked... it's impossible to guess what the right answer is.

True. 😅
We don't know the full qn and all 4 options.

Options are?
Metal is a good conductor of heat
Paper is poor conductor
Air is poor conductor?
????

[floppy]

00skyblue00\" post_id=\"2120052\" time=\"1696456616\" user_id=\"143605:

True. 😅
We don't know the full qn and all 4 options.

Options are?
Metal is a good conductor of heat
Paper is poor conductor
Air is poor conductor?
????

IIRC, the 4 options are:
a) Metal is a good conductor of heat
b) Paper is poor conductor of heat
c) Who cares, it’s over
d) All of the above

[00skyblue00]

floppy\" post_id=\"2120054\" time=\"1696460477\" user_id=\"97579:

IIRC, the 4 options are:
a) Metal is a good conductor of heat
b) Paper is poor conductor of heat
c) Who cares, it’s over
d) All of the above