PSLE 2012 - Science

[GLORYmum]

Big fish:

GLORYmum:

[quote=\"Big fish\"]Tks. That is the problem of having 2 threads. Don't know where to see.

Pls discuss here lah.

我滚回来了！！！！！ :shock: :shock: :shock:[/quote]



好大的风呀！！

[vaidyanathan padmini]

How about friction question from McQ…

My dd’s answer is only C as friction opposes motion…
Only the box in c is moving so it should have friction

[ultimateschooler]

Stigma

[ximinful]

vaidyanathan padmini:

How about friction question from McQ.....

My dd's answer is only C as friction opposes motion...
Only the box in c is moving so it should have friction

My ans is B&C but it seems like many have written A as well.

[moonee]

vaidyanathan padmini:

How about friction question from McQ.....

My dd's answer is only C as friction opposes motion...
Only the box in c is moving so it should have friction

according to the teachers and friends of my dd, the answer is A B and C. Cfmirm

[concerned_of_PSLE 10]

vaidyanathan padmini:

How about friction question from McQ.....

My dd's answer is only C as friction opposes motion...
Only the box in c is moving so it should have friction

B and C

[concerned_of_PSLE 10]

I thought should be anther because the stigma may be pollinated beforehand without pollen grain fertilisation cannot happen

[ximinful]

concerned_of_PSLE 10:

vaidyanathan padmini:

How about friction question from McQ.....

My dd's answer is only C as friction opposes motion...
Only the box in c is moving so it should have friction

B and C

:rahrah: :rahrah:

[creamyhorror]

concerned_of_PSLE 10:

I thought should be anther because the stigma may be pollinated beforehand without pollen grain fertilisation cannot happen

If pollination has already occurred, then how will removing the anther help? It doesn't make sense to ask the question if the flower is already pollinated and will produce seeds soon.

vaidyanathan padmini:

How about friction question from McQ.....
My dd's answer is only C as friction opposes motion...
Only the box in c is moving so it should have friction

What was the question? I haven't seen it, but friction can act on objects to stop them from moving, even if the objects aren't moving at all. That's called static friction.

[thesjarox]

vaidyanathan padmini:

How about friction question from McQ.....

My dd's answer is only C as friction opposes motion...
Only the box in c is moving so it should have friction

Confirmed with teacher-A,B and C.
Friction also acts on stationary objects. That's why forces have to overcome the friction before being able to move the object. Also, if there were no friction acting on an object,the object would glide across the surface, like ice, and would never stop.
Thus, A is also correct.