Q&A - PSLE Science

[BOOMZ]

starlight1968sg:

May I ask if amount of frictional force depends on amount of surface area ie the bigger the surface area in contact, the larger the frictional force?

Yes. The larger the surface area in contact with another surface, the greater the amount of frictional force.

[P.047330KH]

https://docs.google.com/viewer?pid=explorer&srcid=0B1RM96g5JaKuNWI0ZDM4NTUtOTE0OC00ZDJlLWFmMmEtMzVhNGQ3NzA4NjRl&chrome=true&docid=d6750013a698304303839cf29e970cc7%7Ccd046ef9be322db188d04007934d9226&a=bi&pagenumber=309&w=138

Hi,
can anyone pls help with question 6? the ans given is (2), but my DD wrote (3) . She says that a frog has many cells, like brain cells, etc, that carry out different function. :?

[Newkiasu2011]

vlim:

ms_lim:

Please help on this question :


http://i53.tinypic.com/o54xh2.jpg\">

Ans key : (1), dd's ans : (3)

My ds also choose (3)... :roll:

Isnt Winding of a car elastic potential energy -> KE >

[P6ians]

Dear atutor2001,

Air can be compressed,right?So why can't the volume of water be 60 ml?
TIA.

[Cockroach]

When the water level reaches 40 ml, the air in the container will resist the rest of the water and prevent more from flowing in

[Tang]

vlim:

ms_lim:

Please help on this question :


http://i53.tinypic.com/o54xh2.jpg\">

Ans key : (1), dd's ans : (3)

My ds also choose (3)... :roll:

Hi,

Winding up a toy car:

Chemical potential energy --> Kinetic energy --> Elastic potentital energy.

So (1) is correct.

[Tang]

bcs-dad:

Hi All,


For the question below (for question part a), the answer key is \"Oxygen\". Can some body please explain this?

My DS answer is Carbon dioxide.

http://i51.tinypic.com/x1wwat.png\">

Thanks in advance..

Hi,

The answer is given in part b - oxygen.
The aim also mentions photosynthesis, so output is oxygen.

[Tang]

bcs-dad:

Hi All,


For the question below (for question part a), the answer key is \"Oxygen\". Can some body please explain this?

My DS answer is Carbon dioxide.

http://i51.tinypic.com/x1wwat.png\">

Thanks in advance..

Hi,

The answer is given in part b - oxygen.
The aim also mentions photosynthesis, so output is oxygen.

[Tang]

bcs-dad:

Hi All,


For the question below (for question part a), the answer key is \"Oxygen\". Can some body please explain this?

My DS answer is Carbon dioxide.

http://i51.tinypic.com/x1wwat.png\">

Thanks in advance..

Hi,

The answer is given in part b - oxygen.
The aim also mentions photosynthesis, so output is oxygen.

[atutor2001]

P6ians:

Dear atutor2001,

Air can be compressed,right?So why can't the volume of water be 60 ml?
TIA.

The pressure (force) exerted by the water in the funnel is very small. Therefore, it is unlikely for the air to be compressed by 20ml (i.e. another 20ml of water to flow in)