Light - Worksheet 2

Light - worksheet 1

Answer Key (Heat)

Class discussion on making a puppet (sample)

Puppet Shadow

E-Notice (Holiday tasks) updated

Update (20 March 2013) Discussion prompts uploaded into MConline. Please proceed to discuss. Have fun! ___________________________________________________________ Dear all, MConline will be down for maintenance. Please work on the discussion tasks from Wednesday onwards. Sorry for any inconvenience caused. Mr Ang

Situation 3 at the MConline Closed

Dear all,

I have closed the discussion for Situation 3 at the MConline.
I have also put up the answers with explanation there.

Did you get it right?

Uses of Heat in Real Life

Hi Children!

I'm so glad that you have made your way to this blog to attempt on this week's challenge.

Now that we have learnt about the effects of heat on things around us; solid, liquid and gas, I will need you to think and answer the following questions:

1) How is heat used in real life? Quote at least 2 examples.

2) Briefly explain how they work.

In your answers, you might want to use the following words:

gain/lost/contract/expand/heat

3) Comment meaningfully on at least 2 of your friends' comments.
Remember to build on each other's knowledge rather than to give a "correct" or "wrong" reply if possible.

Have fun!

Mr Ang

Complete Answer for 5E Package, Pg 8

As the water in the basin is hotter than liquid A, liquid A gained heat from the water in the basin. This resulted in the increase in temperature of liquid A and the decrease of temperature of the water in the basin until both of them had the same temperature. Both temperature then slowly decreased till they reached the room temperature.

Situation 2

Study the line graph below.

 



Are you able to tell me what exactly happen at the 5 different points of time?

Your answers should look like these:
1)
2)
3)
4)
5)

Use the comment function.

Situation 1 (Discussion Closed)

John did the following experiment.

He dipped his hand into a beaker of ice water for a minute before dipping it into another beaker of water at room temperature. He then commented that his hand in the beaker with the water at room temperature felt very warm and comfortable.

Peter who happened to be around then dipped his hand into the same beaker of water at room temperature. However, he claimed that his hand felt cold.

Can you explain the difference in their experiences?

Please give your comments using the "comment" function.
You will need to:
1) provide at least one comment of your own and
2) provide comments on at least another two of your friends' comments.

All comments are to be meaningful and serve to build more knowledge among your peers and yourself. Have Fun!

Mr Ang

Explanation:

As the temperature of John's hand was higher than the ice water, his hand lost heat to it. Hence, his hand would feel cold.  His hand would then be of a lower temperature as compared to the water in the other beaker at the room temperature. His hand therefore gained heat. This explains why he felt warm.

Peter, on the other hand, felt cold as he lost heat to the water at the room temperature. The temperature of his hand is probably higher than the room temperature.

Scientific Principle:
Heat travels from a hotter object to a colder object until both have the same temperature.

Common misconception:

• gains coldness (wrong) should be lost heat

This discussion is officially closed.