6.7

6.7 starter

01 December 2011

19:37

Tell the person next to you…
1. If the field lines are close together, what does this tell you about the field?
2. If the field lines are widely spaced, what does this tell you about the field?
3. If the magnetic field lines are parallel to each other, what does this tell you about the field?

Answers
1. The field is strong
2. The field is weak
3. The field is of a constant strength - a "uniform" field

6.7

28 November 2011

15:08
· 6.7 know how to use two permanent magnets to produce a uniform magnetic field pattern

· When the field lines are parallel, the field will be uniform

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6.6

6.6

28 November 2011

15:07
· 6.6 sketch and recognise the magnetic field pattern for a permanent bar magnet and that between two bar magnets

6.4

Plenary questions and the Earth's Magnetic field.ppt Download this file

6.4

28 November 2011

15:07

• 6.4 understand the term ‘magnetic field line’

Observing the magnetic field around a bar magnet and a wire

magnetic field around a bar magnet and wire

· Use iron filings to observe the magnetic field around a bar magnet
· Use plotting compasses to observe the field
· Use the 3D field demonstrator to observe field

6.4 Field around bar magnet simulation

28 November 2011

15:06

Website:

http://www.walter-fendt.de/ph14e/mfbar.htm

6.4 plenary questions and Earth's Magnetic Field

01 December 2011

19:12

6.2

6.2 Starter

28 November 2011

14:52

Neodymium magnets are strong…

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 (lodestone), 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

>

Attraction and repulsion quiz.swf Download this file

6b Plenary Multichoice questions.pptx Download this file

6.5 and 6.3

6.5 and 6.3

28 November 2011

15:07
· 6.5 understand that magnetism is induced in some materials when they are placed in a magnetic field
· 6.3 recall the properties of magnetically hard and soft materials

Practical
1. Stroke a magnet along a steel bar and an iron bar
2. Try picking up some bar clips
3. Bang both bars on the desk
4. Now try picking up the paperclips again
5. Repeat the experiment but this time put the bars inside an electromagnet instead of stroking them

Explanation
· Steel is a magnetically hard material. It retains its magnetism when magnetised
· Iron is a magnetically soft material. It can be magnetised, but easily loses its magnetism

5.19 Ideal graph and conclusion and questions

5.19 Ideal graph and conclusion

09 November 2011

15:15

5.19 Boyle's Law

5.19 Boyle's Law

28 October 2011

11:11

·         

5.19 use the relationship between the pressure and volume of a fixed mass of gas at constant temperature:

                 p₁V₁ = p₂V₂

p₁ = Pressure at the beginning [kPa, bar or atm]

V₁ = Volume at the beginning [m³ or cm³]

p₂ = Pressure at the end [kPa, bar or atm]

V₂ = Volume at the end [m³ or cm³]

(Note: can use any units for V and p as long as they are the same at the beginning and end)

5.19 Boyle's Law

5.19 Experiment

07 November 2011

14:32

Ideal Gas - Boyle's Law.xlsx Download this file

5.19 Boyle's Law

5.19 Boyle's Law demos

02 November 2011

20:01

Fun with the vacuum pump!

·         

Marshmallows

·         Food colouring in pipettes

·         Surgical gloves

5.13

5.13 Starter

·         

How can you fit a giraffe, 2 dogs and a swan into a standard laboratory beaker?!

5.13 Starter 2

02 November 2011

18:17

·         Use particle theory to explain why the gas in the balloon contracts

  

Explanation

·         The temperature of the gas inside the balloon decreases so the average speed of the particles decreases

·         Consequently the gas particles collide with the walls of the balloon with less force and less collisions per second

·         Because the walls of the container are flexible, the  volume decreases

5.13 Charles' law

28 October 2011

11:10

·         5.13 understand that there is an absolute zero of temperature which is –273^oC

	<<Charles' law interactive experiment.swf>>
			Open the Charles' law interactive experiment ·         Adjust the temperature ·         What’s the relationship between temperature and volume? ·         Plot a graph of V against T ·         Take a screen shot of the graph

5.13 results and conclusion

28 October 2011

11:10

Conclusion

·         Volume is directly proportional to absolute (Kelvin) temperature

·         (gas is at constant pressure - flexible container)

·         V α T

5.13 Plenary

02 November 2011

19:13

http://phet.colorado.edu/en/simulation/gas-properties

Instructions

·         Keep the Pressure constant (flexible container)

·         Pump some gas particles in

·         Predict what will happen when you heat the gas.  Try it.

·         Predict what will happen when you cool the gas.  Try it.

 

Question

·         What would happen to the volume of the container if you could cool the gas to absolute zero, 0K?

Charles' law interactive experiment.swf Download this file

PhET Gas Properties simulation

Click to Run

5.11

5.11 Starter

>

· 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

· 5.11 understand the significance of Brownian motion

>

Model 1
· What does the red puck represent?
· What do the metal balls represent?
[cid:image001.png@01CC9989.A14EFF60]

[cid:image002.png@01CC9989.A14EFF60]

>

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

5.11 Questions

1. Draw the path of a smoke particle in air (3 marks)
2. Explain what is meant by Brownian Motion of smoke particles in air and how it provides evidence for air particles (4 marks)
3. What change would you expect to see in the movement of the smoke particles if the air was cooled down? Why? (2 marks)

brownian_motion.swf Download this file

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5.12 + 5.15

5.12+5.15 Starter

02 November 2011

16:15

>

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
[cid:image001.png@01CC9986.E18EA0B0]

Try the animation http://www.lon-capa.org/~mmp/kap10/cd283.htm
1. How do the particles create a pressure?
2. If you increase the temperature, how does the movement of the particles change?
3. If you increase the temperature, how does the number of collisions per second change?
4. If you increase the temperature, what does this do to the pressure?

5.12+5.15 Plenary

02 November 2011

15:55

>

Ideal gases - summary of terms.pptx Download this file

States of matter

State.docx Download this file

5.9 and 5.10

5.9 and 5.10 starter

Tell the person next to you…
· How do particles in move in a solid, a liquid and a gas?
· Describe…
o speed of particles
o relative position of particles (fixed or not)
o pattern of particles (regularly arranged or not)
o size of the particles
o space between the particles
o strength of bonds between the particles

s,l,g animation.swf Download this file

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5.7 and 5.8 answers (corrections).

Document2.docx Download this file

5.7 and 5.8 answers.

Document2.docx Download this file

5.7 and 5.8

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

· Use following pages from Collins as a resource to help you
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[cid:image020.jpg@01CC9576.07199B60]
[cid:image021.jpg@01CC9576.07199B60]
[cid:image022.jpg@01CC9576.07199B60]
[cid:image023.jpg@01CC9576.07199B60]

5.7 and 5.8 Experiment - Cooling Curve of Stearic Acid using data logger

[cid:image024.jpg@01CC9576.07199B60]

states of matter drag and drop plenary.swf Download this file

Fill the trucks - Properties of s,l,g.swf Download this file

Q5 CORRECTIONS

Q5.docx Download this file

5.6 Answers

Q5.docx Download this file

5.6

5.6

07 October 2011

10:40
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)

5.6 Demo - squirting water column

12 October 2011

07:24

[cid:image001.jpg@01CC94C6.C4A53AA0]

· 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

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Objective 5.4

5.4 Starter

07 October 2011

11:46
[cid:image001.png@01CC94B8.E00F63A0]
[cid:image002.png@01CC94B8.E00F63A0]

5.4 Starter 2 explained

07 October 2011

09:04

>

· 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!

5.4

07 October 2011

10:37
· 5.4 recall and use the relationship between pressure, force and area:

pressure = force / area

p = F / A

[cid:image004.png@01CC94B8.E00F63A0]

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