Physics: 2011

Monday, December 5, 2011

6.2

6.2 Starter

28 November 2011

14:52

Neodymium magnets are strong…

<<Attraction and repulsion quiz.swf>>

6.2 starter 2

01 December 2011

18:23

· Magnetic materials are attracted by magnets.

· Can you list the 5 magnetic materials?

(3 elements, 2 compounds)

Answer

3 elements

1. Fe (iron)

2. Co (cobalt)

3. Ni (nickel)

2 compounds

1. Steel (an alloy of iron)

2. Fe₃O₄ (magnetite, one of the oxides of iron)

And the exceptions that prove the rule… ?

· Magnet moves water - diamagnetism

· Levitating frog...

· Ferrofluids…

(Picture on page "6.4 6.5 6.6 6")

6.2

01 December 2011

18:21

· 6.2 recall that magnets repel and attract other magnets, and attract magnetic substances

Question

You have 3 bars that all look the exactly the same but they are made from:

1. a magnet

2. steel

3. aluminium

You are given a horseshoe magnet. How can you use this to tell which bar is which?

Answer

1. The bar magnet will be attracted to one pole of the horseshoe magnet and repelled by the other

2. The steel bar will be attracted to both poles of the horseshoe magnet

3. The aluminium bar will be attracted to neither pole of the horseshoe magnet

6.2 Plenary - Multichoice questions

01 December 2011

18:12

<<6b Plenary Multichoice questions.pptx>>

Attraction and repulsion quiz.swf Download this file

6b Plenary Multichoice questions.pptx Download this file

P6 student objectives sheet

04 October 2011

13:32

<<P6 IGCSE Physics Student Objectives.doc>>

P6 IGCSE Physics Student Objectives.doc Download this file

P6 Keywords - First Homework

Unit 6 Keywords and Mixed Definitions.doc Download this file

P6 Keywords - First Homework

02 September 2010

18:41

Step 1 = Unscramble the Keywords and Mixed Definitions sheet.

4 options:

· Kinaesthetic Learners = Cut and Stick into your exercise book. Take a photo of your work and send to your blog

· Kinaesthetic Learners = Cut and Paste in the Word document and send to your blog

· Visual Learners = Copy out into your exercise book. Take a photo of your work and send to your blog

· Visual Learners = Type out and send to your blog

Step 2 = Check your keywords by using one of the following online games. Make corrections to your work in a different coloured pen/font so that you can see your mistakes clearly.

· http://www.patana.ac.th/LearningObjects/%7BB2E05D2D-6442-4DC6-891F-6700A8DD4BC2%7D_Y11%20unit%206%20matching.htm

· http://www.patana.ac.th/LearningObjects/%7B513CF811-DFDA-4F29-892A-3166E43E9ADD%7D_Y11%20unit%206%20matching2.htm

· http://www.patana.ac.th/LearningObjects/%7B6BCADDA4-9A8F-44AF-98B4-C1073541E5B9%7D_Y11%20unit%206%20crosswords.htm

<<Unit 6 Keywords and Mixed Definitions.doc>>

P6 Keywords games - instructions for embedding into your Posterous blog

28 October 2011

11:14

· Create a post

· Turn on HTML editor

· Copy in this text and Publish

· This is what you get…

http://maddog11physics.posterous.com/p6-keywords

Monday, November 21, 2011

From: Matt Baker
Sent: Tuesday, November 22, 2011 10:18 AM
To: Amaris Odermatt; Churaimas Diskul; Hannah Amanda Fotheringham; Janyaporn Buaboos; Jarouwit James; Khuntup Issara; Oliver Thomas Bailey; Tamara Nikki Davies
Subject: 5.18 Answer

5.18 Answer

07 November 2011

15:08

Collins, p.116

a. If we cool the gas in a rigid, sealed tin can, what happens to the pressure inside the can? (1 mark)

The pressure will decrease

b. Explain your answer to part a. by using the Kinetic Theory (4 marks)

· The volume remains the same because a tin can is a rigid container

· If the temperature decreases the gas molecules have a lower average Kinetic Energy

· So there are less collisions between the gas molecules and the walls of the container per second

(NB: Can also say that slower molecules will collide with less force) (1 mark)

· So the pressure in the container will decrease

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5.17

5.17 starter


	<<Video - Egg sucked into a bottle by Guy-Lussac's Law.flv>>

Why do the eggs get sucked into the bottles?!

Explanation

· The burning paper in the bottle heats the air in the bottle

· When the egg gets placed on top, the oxygen supply in the bottle is rapidly depleted and the paper goes out

· The bottle is sealed by the egg and now has a constant volume of gas inside

· The hot gas in the bottle now starts to cool which reduces the pressure inside the bottle

· The pressure outside the bottle remains unchanged and so there is now an unbalanced force on the egg which accelerates the egg into the bottle

5.17

28 October 2011

11:11

· 5.17 describe the qualitative relationship between pressure and Kelvin temperature for a gas in a sealed container

Instructions

· Launch the application on this website: http://phet.colorado.edu/en/simulation/gas-properties

· Put 5 pumps of gas in

· Set volume as the Constant Parameter

· Heat to 1000K

· Watch what happens to the Pressure

Conclusion

· If you increase the temperature, you increase the pressure

5.17 Demo

02 November 2011

19:56

Cloud formation

· Place a little water in the bottom of a 1½ litre plastic bottle

· Squeeze a few times

· Introduce a small amount of smoke

· Squeeze and release several times

· When you squeeze, the cloud disappears; when you release, the cloud reforms

Explanation

· When the pressure increases the temperature increases and vica versa

· The "cloud" is water droplets - liquid water

· When you squeeze the bottle the temperature increases and the droplets turn into water vapour

· The smoke particles are nucleating sites on which the water can condense

Monday, November 14, 2011

FW:

Ideal Gas - temperature vs average KE of particles blank table.xlsx Download this file

5.16 Virtual Experiment

28 October 2011

11:11

· 5.16 understand that the Kelvin temperature of the gas is proportional to the average kinetic energy of its molecules

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Ideal Gas - temperature vs average KE of particles blank table.xlsx Download this file

Monday, October 24, 2011

5.6 Demo - squirting water column

· The bottom hole squirts water the furthest

· Because the water at the bottom has the greatest pressure

· Because in the formula ∆p = h × ρ × g, ρ is constant, g is constant and h is large

· So ∆p = large

5.6

· 5.6 recall and use the relationship for pressure difference:

pressure difference = height × density × g

∆p = h × ρ × g

∆p = pressure of the fluid (N/m² or Pa)

h = height of the fluid (m)

ρ = density of the fluid (kg/m³)

g = gravitational field strength (N/kg)

5.5 Demo 1 - Magdeburg Hemispheres

Magdeburg Hemispheres

· And here are the horses I was talking about!

5.5

· 5.5 understand that the pressure at a point in a gas or liquid which is at rest acts equally in all directions


	<<Pressure Underwater.wmv>>

5.4 Pressure Questions

· PFY p.91, Q.3 and 7.

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5.4

Pressure Formula.ppt Download this file

· 5.4 recall and use the relationship between pressure, force and area:

pressure = force / area

p = F / A

Untitled

animation - why a drawing pin works.swf Download this file

· Your finger pushes on the pin and the pin pushes back on your finger

· N3L tells us that all these two forces are equal in size

· The pin pushes on the wall and the wall pushes back on the pin

· N3L tells us that all these two forces are also equal in size

· If the surface area is large then the force is spread over a large area and the pressure is low

· If the surface area is small then the force is spread over a small area and the pressure is high

· You would like the pressure on your finger to be low and the pressure on the wall to be high

· The other way round is painful!

Untitled

5.4 Starter

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Starter.ppt Download this file

Untitled

Unit_5_Keywords_and_Mixed_Defi.docx Download this file

Monday, September 19, 2011

Untitled

f.) Power is the rate of doing work

Powe (in watts) = Work done (in Joules)/ Time (in Seconds)

g.) 1 Watt is a rate of working of one Joule per second

13.) A girl does 1000 J of work in 5 seconds. What power does her develop?

1000J/ 5s = 200 watts in power

14.) A man lifts a weight of 300N through a vertical height of 2m in 6 seconds. What power does he develop?

Work done = Force x Distance.
Work done = 300N x 2m
Work done = 600J

Power = Work done/ time

Power = 600J / 6 s

Power = 100 W

16.)

Monday, September 12, 2011

CoE questions

PFY p.121

a.) 500N

b.) GPE = mgh. Mass = 50 kg, Height = 4 m, 10N = 50x10x4 = 2000

c.) 2000 the GPE is the same as the KE

Collins, p.91

a.) GPE = 35x30x10 = 10500

b.) 10500

c.) 10500/

Monday, September 5, 2011

4.10

· 4.10 understand that work done is equal to energy transferred

PFY p.112

Collins p. 91

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