2023 PSLE Discussions and Strategies (Children born in 2011)

[Happybee1114]

Got it! Thanks Zac’s mum and 00Skyblue00!

[koudayao27]

mershel13\" post_id=\"2120009\" time=\"1696394950\" user_id=\"60253:

Yup exams over but still curious to know the correct answer….so just discussing la, no harm also. 😃

I think the candle sits on a cardboard base and not touching any metal directly. Also, the metal piece is used as a handle. If it is in direct contact with the heat source, it would be too hot to touch isn’t it?

Yeah, there's no part of the lantern directly in contact with the flame, but the metal is positioned right above the flame, receiving the most heat. The paper receives its heat through conduction from the metal

Otherwise, why doesn't the cardboard, which is also a poor conductor, catch fire?

[koudayao27]

ABC12345678910\" post_id=\"2120019\" time=\"1696400135\" user_id=\"202989:

1) The push force was used up causing the ball to fall (My son's answer)
2) The weight of the ball caused the ball to slow down. I would appreciate your opinions on this question. Thank you!

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.

[mershel13]

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.

[Elson]

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.

Just chipped in for discussion purpose since I am not exactly sure how the question was phrased. I tend to think (2) is correct answer 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.

[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]

Dear parents,

Please take a little bit of time to read through what I wrote on used resources.
Thanks.

For parents who could be considering how to dispose of used resources
https://passioninlearning.wordpress.com/2023/09/29/used-resources-3/

[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.