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Comments (12)

Allyson Lim said

at 10:06 am on Aug 27, 2011

Hi Mr Ang, what do you mean by work is done? As in, how do you explain the meaning of work done?

johnlittlephysics said

at 5:40 pm on Aug 27, 2011

In physics, work is done if a force moves an object through a distance. E.g. A force is needed to move a molecule further away from another molecule, so work is done in the process and energy is stored as potential energy. Hence when a substance is heated, its molecules move further apart with an increase in potential energy.
Btw, work done is learnt in Sec 2 & 3.

Allyson Lim said

at 2:37 pm on Aug 27, 2011

Hi Mr Ang, what do you mean by intermolecular forces?

johnlittlephysics said

at 5:49 pm on Aug 27, 2011

These are forces existing between neighbouring molecules in a substance. It is an attractive force when molecules are moving apart, hence a force is needed to pull molecules further apart (increase separation or spacing), as described in previous post above.
Further reading http://www.science.uwaterloo.ca/~cchieh/cact/c123/intermol.html

johnlittlephysics said

at 10:17 am on Aug 28, 2011

Except for general questions, post questions under specific wiki pages for specific topics or WS/AS questions or Block Test topics. Thank you.

Chang Kai Lin said

at 9:20 pm on Sep 13, 2011

Hi Mr. Ang, may I know what is latent heat of evaporation/latent heat of fusion? The notes don't give a clear explanation so I don't really get it... Thanks! :)

johnlittlephysics said

at 7:58 am on Sep 14, 2011

Latent heat just refers to the thermal energy that is absorbed or given out during a change of state, without a change in temperature. No detailed knowledge is expected or assessed at Sec 1. Btw, do post questions under the specific topics for your class. Thanks.
General reading at http://en.wikipedia.org/wiki/Latent_heat

Chang Kai Lin said

at 5:55 pm on Sep 14, 2011

oh sry! >< I will in future! thanks! :)

Sim Jia Ling said

at 11:47 pm on Sep 14, 2011

Hi Mr Ang, for latent heat, must we specify whether it is latent heat of fusion or latent heat of vaporisation?

johnlittlephysics said

at 12:01 am on Sep 15, 2011

It would be good, but we would not be so strict at this level.

Allyson Lim said

at 3:28 pm on Sep 23, 2011

Hi Mr Ang, is it possible to explain question 1 of the block test 3 paper? I do not really understand. Thank you! (:

johnlittlephysics said

at 12:11 am on Sep 28, 2011

I would post answer on the wiki page for that paper http://nyghsec1physics.pbworks.com/w/page/45733412/11BT3A
Follow link from main wiki page.

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