1. A) conduction
Insulators
Conductors
B) convection
Liquids
Gases
C) heat
Reflected
Good
Bad
Good
Poor
D) radiation
Conduction
Convection
PFY p.54
Monday, August 29, 2011
4.8
4.8
10 June 2011
11:42
· 4.8 describe how insulation is used to reduce energy transfers from buildings and the human body
Task 1
· Use this interactive animations to investigate how different insulation affects the rate of cooling of hot water
<<Cooling of hot water with insulation - interactive.swf>>
Task 2
· Use these interactive animations to find out about the energy transfers in a house
| |||
| <<Types of energy transfers in a house - interactive.swf>> | <<Insulation in a house - % heat losses and savings.swf>> |
Task 3
· Test your knowledge with this quiz
<<Quiz - Types of energy transfers in a house.swf>>
4.8
4.8
10 June 2011
11:42
· 4.8 describe how insulation is used to reduce energy transfers from buildings and the human body
Task 1
· Use this interactive animations to investigate how different insulation affects the rate of cooling of hot water
<<Cooling of hot water with insulation - interactive.swf>>
Task 2
· Use these interactive animations to find out about the energy transfers in a house
| |||
| <<Types of energy transfers in a house - interactive.swf>> | <<Insulation in a house - % heat losses and savings.swf>> |
Task 3
· Test your knowledge with this quiz
<<Quiz - Types of energy transfers in a house.swf>>
4.7
· 4.7 describe the role of convection in everyday phenomena
Task 1
· Try the animation
· Extension: what is happening to the particles in the air?
<<Convection in a room with a radiator.swf>>
Task 2
· Why is Lee tired after cycling to the Sea in the morning?
· Predict what will happen when Lee cycles home in the evening
<<Lee cycles towards the sea ... and back worksheet.pdf>>
Answers to Entrance Activity for 4.7
Answers to
Entrance Activity for 4.7
10 June 2011
15:32
Answers...
1. What is the most common heat transfer mechanism in solids?
Conduction
2. What is the most common heat transfer mechanism in liquids and gases?
Convection
3. What is the only heat transfer mechanism in a vacuum?
(Infra-red) Radiation
4. Why can't conduction happen in a vacuum?
There are no particles in a vacuum to transfer the vibrations
5. What happens to the space between the particles in a gas when you heat it?
The space between the particles increases
6. What happens to the density of a gas when you heat it?
It decreases because the space between the particles increases
7. Why can't convection happen in a solid?
In a solid the particles are fixed in position and are not free to move
Thursday, August 25, 2011
Model Answers
Model Answers
Q: What is the limitation of the "Particle Model - Conduction" animation?
A1: The spacing between the particles does not increase when the solid is heated. In reality the spacing between particles increases and this results in the expansion of solids when heated.
A2: Even before the match is lit the solid has some heat (unless it is cooled to absolute zero, -273degC!) so there would be some vibration of the particles. As heat spreads through the solid the vibration increases.
Q: What's the mistake in the description of convection in the "Cooking using Conduction, Convection and Radiation" animation?
A: The mistake is in this sentence
The molecules DO NOT shrink when cool! The space between the molecules gets less as the molecules have less Kinetic Energy.
Notes on Conduction, Convection and Radiation from Collins
From: Matt Baker
Sent: Friday, August 26, 2011 8:05 AM
To: Amaris Odermatt; Churaimas Diskul; Hannah Amanda Fotheringham; Janyaporn Buaboos; Jarouwit James; Khuntup Issara; Oliver Thomas Bailey; Tamara Nikki Davies
Cc: maddog11physics@posterous.com
Subject: Notes on Conduction, Convection and Radiation from Collins
Notes on Conduction, Convection and Radiation from Collins
26 August 2011
08:01
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