IGCSE-SYLLABUS-Physics-4PH0-Specification-ISSUE-2-March09.pdf Download this file
Thursday, November 10, 2011
Next Physics e-lesson 5.12+5.15
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Questions
· Why does the needle on the meter move when gas particles are introduced into the box?
· What does the meter measure?
Answers
· The gas particles collide with all of the walls of the container. The wall on the right moves outwards and moves the needle.
· Pressure. The gas particles colliding with the walls makes a force on the walls. The walls have a surface area so the quantity measured is pressure, p=F/A.
5.12+5.15 Questions
02 November 2011
15:55
· 5.12 recall that molecules in a gas have a random motion and that they exert a force and hence a pressure on the walls of the container
· 5.15 understand that an increase in temperature results in an increase in the speed of gas molecules
Try the animation http://www.lon-capa.org/~mmp/kap10/cd283.htm
5.11
Instructions for Objective 5.11
1. 5.11 Starter. Watch the video and think about the question. No need to type anything.
2. 5.11. Watch the videos and animations for the 3 models of Brownian Motion (for Model 3 you need to open the attached). Think about the questions. No need to type anything.
3. 5.11 explained. Check your understanding with the model answers.
4. 5.11 Questions. Forward this e-mail to your blog and complete the questions.
5. Answers to step 2 will be sent separately. Don’t look at them until you’ve done the work!
5.11 Starter
02 November 2011
16:58
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| <<Video - Brownian Motion smoke in air.wmv>> | ||
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· You're looking at smoke particles in air under a microscope
· They appear to be jiggling about
· Why?
· (Don't worry if you can't work this out straight away - Albert Einstein was the bloke who eventually explained what's happening here!)
5.11
28 October 2011
11:10
· 5.11 understand the significance of Brownian motion
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| <<Video - Model of Brownian motion.wmv>> | ||
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Model 1
· What does the red puck represent?
· What do the metal balls represent?
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| <<brownian_motion.swf>> | ||
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Model 3
· What do the "smoke" particles look like?
· Why are they moving?
· What do the "air" particles look like?
5.11 explained
Model 1
· What does the red puck represent?
o The large, visible smoke particle
· What do the metal balls represent?
o The small, not visible air particles
Model 2
· What do the small red particles represent?
o The small, not visible air particles
· What does the large blue particle represent?
o The large, visible smoke particle
· What does the view on the left of the screen represent?
o The view through the microscope lense
· Why can‘t you see the red particles in this view?
o They are too small to see
Model 3
· What do the "smoke" particles look like?
o They are the 5 large, sand coloured particles
· Why are they moving?
o Small, fast moving air particles are colliding with the smoke particles and making them move
· What do the "air" particles look like?
o They are the numerous, small, white particles
Friday, November 4, 2011
5.7 and 5.8
5.7 understand that a substance can change state from solid to liquid by the process of melting
· 5.8 understand that a substance can change state from liquid to gas by the process of evaporation or boiling
5.7 and 5.8 Experiment - Cooling Curve of Stearic Acid using datalogger
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Tuesday, November 1, 2011
particle table
5.9 recall that particles in a liquid have a random motion within a close-packed irregular structure
5.10 recall that particles in a solid vibrate about fixed positions within a close-packed regular structure
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