Michelle's Physics: October 2011

Saturday, October 29, 2011

5.7 and 5.8

Begin forwarded message:

From: Matt Baker <maba@patana.ac.th>
Subject: 5.7 and 5.8 ((no gallery))
Date: October 28, 2011 1:32:24 PM GMT+07:00
To: Andrew Koomenjoe Nyaga <anny14@patana.ac.th>, Arisara Amrapala <aram14@patana.ac.th>, Boondaree Chang <boch14@patana.ac.th>, Chrischawit Chomsoonthorn <chcm14@patana.ac.th>, Christopher Lo <chlo14@patana.ac.th>, Connor Blair Sailes <cosa14@patana.ac.th>, Frazer Allen Briggs <frbr14@patana.ac.th>, Huei-Yu Daniel Lo <hulo14@patana.ac.th>, Isabel Catriona McDonald <ismd14@patana.ac.th>, Kavin Supatravanij <kasu14@patana.ac.th>, Luke Michael Gebbie <luge14@patana.ac.th>, Lydia Anna Foley <lyfo14@patana.ac.th>, Morrakot Sae-Huang <mosa14@patana.ac.th>, Puchawin Borirackujarean <pubo14@patana.ac.th>, Qing Tang <qita14@patana.ac.th>, Sanyam Grewal <sagr14@patana.ac.th>, Sebastien Grimm <segr14@patana.ac.th>, Soo Hyun Lee <sole14@patana.ac.th>, Tatiksha Singh <tasi14@patana.ac.th>, Usa Wongsanguan <uswo14@patana.ac.th>, Yanida Areekul <yaar14@patana.ac.th>, Yi-Lin Huang <yihu14@patana.ac.th>

Dear 11.1X,
Instructions for Objective 5.7 and 5.8
1.
5.7 and 5.8 Starter. Find out the names of the processes. Research on the internet if necessary. No need to blog this.
2.    5.7 and 5.8. Forward this e-mail to your blog and type the answers into the e-mail.
3.    5.7 and 5.8 Experiment. I’m afraid you can’t do the expt until we get back but watch the video clip to see how it’s set up and have a look at the graph of the results.
4.    5.7 to 5.10 Plenary 1. Play the attached “States of Matter”
5.    5.7 to 5.10 Plenary 2. Play the attached “Fill the trucks”
6.    PhET States of matter simulation - embedding into your Posterous blog. Embed in your blog and then have a play
5.7 to 5.10 Plenary 1

·         Play the Stage 1 game to test your knowledge of solids, liquids and gases
·         Play the Stage 2 game to test your knowledge about changes of phase!

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

5.7 to 5.10 Plenary 2

Play the Level 1 game to test your knowledge of the properties of solids, liquids and gases

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

Extension: Play the Level 2 game to extend your knowledge about changes of phase!

PhET States of matter simulation - embedding into your Posterous blog
28 October 2011
11:14
· Create a post

· Turn on HTML editor

· Copy in this text and Publish

<div style="position: relative; width: 300px; height: 225px;"><a href="http://phet.colorado.edu/sims/states-of-matter/states-of-matter_en.jnlp" style="text-decoration: none;"><img src="

" alt="States of Matter" style="border: none;" width="300" height="225"/><div style="position: absolute; width: 200px; height: 80px; left: 50px; top: 72px; background-color: #FFF; opacity: 0.6; filter: alpha(opacity = 60);"></div><table style="position: absolute; width: 200px; height: 80px; left: 50px; top: 72px;"><tr><td style="text-align: center; color: #000; font-size: 24px; font-family: Arial,sans-serif;">Click to Run</td></tr></table></a></div>
· Success! Now have a play with the simulation...

Friday, October 28, 2011

5.7 and 5.8 Experiment

5.7 and 5.8 Experiment - Cooling Curve of Stearic Acid using datalogger

5.7 and 5.8

5.7 and 5.8 Starter
·
What are the 6 processes shown by the arrows?

Melting Solid --> Liquid

Evaporation Liquid --> Gas

Sublimation Gas <---> Solid

Condensation Gas --> Liquid

Freezing Liquid --> Solid

·
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
·         Questions from Collins p.112
·         Answer in Bullet Points!

Q1) a. Solids keep the shape because their particles are only vibrating in a fixed position. This means that their shape is simply "fixed" as well as particles are not free to move around. As with liquids, particles are able to slide over each other, and are freely to move around in gases , therefore they do not have a fixed shape.

b. Solids and liquids have a fixed volume because the particles are packed closely together. However, the particles are widely spaced in gas, so therefore they extend to fill

·
Use following pages from Collins as a resource to help you

5.9 and 5.10

Tell the person next to you…
·
How do particles in move in a solid, a liquid and a gas?
·         Describe…
o    speed of particles - The particles in solid vibrates, therefore they have the slowest speed. Liquid has a faster speed while gas is the fastest.
o    relative position of particles (fixed or not) - Solid vibrates in a fixed position while liquid and gas do not.
o    pattern of particles (regularly arranged or not) - Only solid has a regular arrangement while liquid and gas do not.
o    size of the particles - Solid has the smallest particle size. Liquid's particles are bigger, and gas has the biggest particle size. (They expand due to heat absorbed during the change of state.)
o    space between the particles - Solid vibrates in a fixed position so the particles are packed closely together. Liquid move around but still slide past each other, so the particles are also in a close position. Gas move around freely in random motion and therefore there are very large space between particles.
o    strength of bonds between the particles - Solid has very strong bond between particles, while liquid has a weaker bond. Gas has a very weak bond (weakest compared to the other two).

Use the animation to verify your answers

·         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
·         Complete the missing words in the table below
·         Cut and paste the particle images into the table

State
Particle
Picture
Arrangement of Particles
Motion of Particles
Other Properties
Solid

·
Closely packed
·         regular pattern
·         Vibrate about a fixed position
·         Fixed shape
·         not easily compressed since particles are closely packed
·         Strong bonds
Liquid

·
Closely packed
·         no pattern
·         free to flow over each other
·         takes shape of its container
·         can be poured
·         not easily compressed since particles are closely packed
·         Weak bonds
Gas

·
widely spaced
·         no pattern
·         very fast moving
·         random directions
·         fills its container
·         can be poured

Saturday, October 22, 2011

5.6 Questions

Begin forwarded message:

From: Morrakot Sae-Huang <mosa14@patana.ac.th>
Subject: Fwd: 5.6 Questions
Date: October 14, 2011 1:52:06 PM GMT+07:00
To: "michellephysics@posterous.com" <michellephysics@posterous.com>

Collins, p.107

Note:
ρ_{fresh water} = 1,000kg/m³; g = 10N/kg

5. Pressure difference = h x density x g
250,000-100,000= h x 1 x 10
h = 15,000 m
The pressure would increase if he were diving in sea water that is denser than fresh water.
6. Pressure difference = h x density x g
= 50 x 0.42 x 1.4
= 29.4 Pa

Total pressure on the diver = atmosphere pressure + water pressure

= 160 + 29.4

= 189.4 kP

≈ 189 kPa

Thursday, October 13, 2011

5.6 Questions

Collins, p.107

Note:
ρ_{fresh water} = 1,000kg/m³; g = 10N/kg

5. Pressure difference = h x density x g

250,000-100,000= h x 1 x 10

h = 15,000 m

The pressure would increase if he were diving in sea water that is denser than fresh water.

6. Pressure difference = h x density x g

= 50 x 0.42 x 1.4

= 29.4 Pa

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)

ps. 1,000mbar = 1 bar = 100,000Pa!

5.6 Demo - squirting water column

The deeper the depth, the greater the water pressure.

·
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

5.5 Demo 2 - Collapsing Bottle

·
Collapsing Bottle

5.5 Demo 1 - Magdeburg Hemispheres

5.5 Demo 1 - Magdeburg Hemispheres
12 October 2011
07:19
·
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

Tuesday, October 11, 2011

5.4 Starter

5.4 Starter
07 October 2011
11:46
<<Starter.ppt>>

Starter.ppt Download this file

5.4 Starter 2 explained

5.4 Starter 2 explained
·
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!