We did a practical to measure the resistance of four different resistors.
We went through the questions on P165 that you did for cover work.
Cover Lesson
Classwork
Read and make notes on P164-5. Answer Q1-3 on P165.
Read and make notes on P166-7. Answer Q1-3 on P167.
If you finish quickly read P170-171 - you might remember some of this from Y7.
Homework
Complete this work and bring to next lesson.
More Sankey diagrams
Classwork
We went through the HW, and people corrected or re-did their Sankey diagrams.
We started to talk about electrical resistance but didn't make any notes - we will start on this next lesson.
Efficiency and Sankey diagrams
Classwork
We made some notes on efficiency and did some example calculations.
We discussed energy transfers in an electric fan and an electric hairdryer, and represented these with Sankey diagrams.
We measured the energy input and useful energy output of a Lego winch system, and calculated its efficiency.
Homework
Answer Q1-2 on P157 and hand in tomorrow morning.
More on payback
Classwork
We did a quiz on the stuff from P158.
We finished off going through the payback time task from last lesson.
We highlighted the difference between solar cells (which generate electrciity) and solar water heating panels (which heat water).
Payback time
Classwork
We went through the test.
We made some notes about payback time (see textbook).
We did this task - we will finish going through it next lesson.
Homework
Read and make notes on P158
Be ready for a quiz next lesson.
Nothing
Classwork
Since there were only a couple of people in the lesson we just built some electrical circuits as recap from Y7 work. There's nothing to catch up on if you weren't here.
We went through the HW, and then looked at a real demonstration of Leslie's cube. The matte black surface emitted the most thermal radiation, and the shiny metal surface emitted the least.
We also watched a demo similar to that on P145 to demonstrate absorption of thermal radiation by different surfaces. The matte black surface warmed up faster than the shiny metal surface, because it absorbed more thermal radiation.
There are some interesting videos on youTube using thermal imaging cameras. Try F1 cars or hot and cold liquids.
Conduction & convection
Classwork
We went through Q1 of the HW in detail.
We looked at some more demos of convection, and watched a few videos that people made at home last night - well done for putting the effort into making those.
We also used a helium balloon in the lesson to show hot air rising from a radiator.
Convection
Classwork
We demonstrated that hot air rises using paper propellors balanced on pencils. A bit like this but made of paper and using the hand as the heat source rather than a candle.
We made some notes on convection and also saw a demo of convection in water.
Homework
Answer P1-2 on P139 and hand in tomorrow morning before registration.
Conduction in metals
Classwork
I gave some feedback on the HW and we discussed why some of the proposed experiments to compare inslulating boot linings would not work.
We discussed why metals are good conductors of heat (but also found that some of the very best conductors of heat are not metals - some are quite newly discovered materials made from carbon).
Thermal conduction
Classwork
We watched a demonstration that compared how well different metals conducted heat.
We made notes on conduction.
Homework
Read P136-7 and add to your notes if necessary.
Answer Q1-2 and hand in before reg on Tuesday.
Bimetallic Strips
Classwork
We discussed some ideas for different uses for bimetallic strips.
Here is a slightly long and boring video about bimetallic strips in thermostats - you don't have to watch the whole thing, but parts of it are interesting, like when he unwinds the coiled up strip so you can see how long it is.
Also I showed you this video in the lesson, which again uses a coiled bimetallic strip.
We discussed where this latent heat energy goes when stuff is frozen in your freezer - if you get a chance, feel the pipes at the back of your freezer and you will find that they are warm.
Measuring specific heat capacity
Classwork
We did a practical to measure the specific heat capacity of aluminium or brass.
We evaluated the result and compared it to the true values, and tried to explain the variation between the measured and the true values.
Homework
Watch and make notes on this video and P132-133 of the textbook.
Bring your notes to next lesson so I can see them.
We will also do an experiment on specific heat capacity next lesson.
Heating and Cooling Curves
Classwork
We tried to compress syringes containing sand, water and air.
We made notes on heating and cooling curves.
We did a practical to plot a cooling curve for steartic acid, and determined its freezing point.
Homework
Watch and make notes on this video using P128-9 of your textbook to help you.
Bring your notes to next lesson.
States of Matter
Classwork
We did some recap on the properties of different states of matter and their particle arrangement.
We will go through the heating curve next lesson, and I'll get a syringe full of water to try to compress.
No Lesson
Classwork
There was no lesson because of the birds of prey talk.
Homework
No homework.
Heating Curves
Classwork
We predicted the shape of the heating curve or water, then did a practical to find out what it really looks like.
We will finish the graphs and analyse them next lesson.
NIII, Terminal Speed
Classwork
We went through Newton's Third Law and Terminal Speed.
It turns out you're not supposed to do terminal speed till next year, but never mind.
Homework
Please go through your test and do corrections in a different colour. Can everybody please bring your corrected test to next lesson where we will go through any areas of difficulty.
Test
Classwork
We did the test.
Next lesson we will do Newton's Third Law.
Topic Recap
Classwork
We did a revision quiz to test our understanding of the topic.
Homework
Revise for test tomorrow.
Newton's Second Law Continued
Classwork
We looked at your graphs and considered the meaning of the line crossing the x or y axis at different points.
