2019 PSLE Discussions and Strategies (Children born in 2007)

[sweetbaby]

AnxiousabtPSLE\" post_id=\"1938927\" time=\"1569903392\" user_id=\"180550:

Yes, one option was potential to kinetic and another option was potential to kinetic to sound.
Normally it should be with sound energy but since Q18 requires conversion FROM THE MOMENT THE BALL HITS THE GROUND, it should NOT have sound energy because the ball is bouncing back up.

Can share the question? My DS's recall is incomplete.

[LeeTaiTai]

whitecarrotcake\" post_id=\"1938910\" time=\"1569902437\" user_id=\"114080:

quixation\" post_id=\"1938899\" time=\"1569901776\" user_id=\"480:

[quote=whitecarrotcake post_id=1938888 time=1569900796 user_id=114080]

Friction between sofa and floor

if DD rmember correctly, its not friction. its due to gravity..

Gravity is unless he's lifting the sofa. The qn is pushing sofa, so it's frictional force.[/quote]Same for dd.. friction btwn sofa and floor

[Iluvmygals]

Sofa question…should be friction…cause thats the only force opposing the push

[LeeTaiTai]

Iluvmygals\" post_id=\"1938929\" time=\"1569903613\" user_id=\"26453:

When the ball is bouncing up....energy conversion is from kinetic to potential.....not sure how the question was asked though...

Dd says its on thr moment of ball bouce up..so kinetic + sound to potential for her.

[sweetbaby]

thebusybee\" post_id=\"1938923\" time=\"1569903067\" user_id=\"4562:

DS said he spotted a few tricky mcq qns which needed to read a few times to understand.
There's a qn abt young plant, after reading the graph carefully, his ans is - the seed starts to grow. Hope he got the right ans!

Can he recall the question?

[tryourbest]

LeeTaiTai\" post_id=\"1938934\" time=\"1569904000\" user_id=\"17608:

Iluvmygals\" post_id=\"1938929\" time=\"1569903613\" user_id=\"26453:

When the ball is bouncing up....energy conversion is from kinetic to potential.....not sure how the question was asked though...

Dd says its on thr moment of ball bouce up..so kinetic + sound to potential for her.

My dd ans is the same as yr gal

[Kei]

AnxiousabtPSLE\" post_id=\"1938927\" time=\"1569903392\" user_id=\"180550:

Yes, one option was potential to kinetic and another option was potential to kinetic to sound.
Normally it should be with sound energy but since Q18 requires conversion FROM THE MOMENT THE BALL HITS THE GROUND, it should NOT have sound energy because the ball is bouncing back up.

DS said his answer is KE to SE + (elastic) PE...his reasoning is all GPE would have been converted to KE when it hit the floor, which is then converted to (elastic) PE since it’s a rubber ball...He couldn’t recall other options with KE to PE + whatever

[sweetbaby]

Kei\" post_id=\"1938941\" time=\"1569905369\" user_id=\"19442:

AnxiousabtPSLE\" post_id=\"1938927\" time=\"1569903392\" user_id=\"180550:

Yes, one option was potential to kinetic and another option was potential to kinetic to sound.
Normally it should be with sound energy but since Q18 requires conversion FROM THE MOMENT THE BALL HITS THE GROUND, it should NOT have sound energy because the ball is bouncing back up.

DS said his answer is KE to SE + (elastic) PE...his reasoning is all GPE would have been converted to KE when it hit the floor, which is then converted to (elastic) PE since it’s a rubber ball...He couldn’t recall other options with KE to PE + whatever

What are the options? thx

[sunnybear]

Anyone know the answer to question 9 MCQ talking about the flower and the coloured water. My DD answer is B & C. Correct?

[shutter]

N@rut0\" post_id=\"1938918\" time=\"1569902809\" user_id=\"181320:

AnxiousabtPSLE\" post_id=\"1938907\" time=\"1569902316\" user_id=\"180550:

So Q18 should be just potential to kinetic

I thought the moment any ball hits the ground, sound is produced. Plus, in the question, they stated that the ball bounced to a lower height. This is because some of its Kinetic Energy is lost as heat and sound energy, so i think the answer has to be KE - -> SE + GPE

My kid also select this.