We made notes on thermistors and LDRs - what affects their resistance, and what they are used for.
Circuit Calculations
Classwork
We went through the rest of the sheet from last week.
We worked out as much as we could about this circuit - we will discuss the current in different parts of the circuit next lesson as we didn't have time for this.
We made some notes on evaporative cooling. Watch this video if you missed the lesson. If you want to recap on energy transfer by vaporization and condensation then watch this video from 9:18.
Energy transfer by design
Classwork
We looked at two items that are designed for high rates of heat transfer - radiators and heatsinks for computers.
As I mentioned, CPU heatsinks look quite cool - have a look at these pictures.
We watched a demonstration of convection in water.
We did Q1-2 on P139.
Homework
Watch the first half of this video (up to 5:30) and read P142-3.
Make notes on these and bring your notes to next lesson.
Convection
Classwork
We demonstrated that hot air rises using paper propellors balanced on pencils. A bit like this but made of paper and using a hand rather than a candle as the heat source.
We answered Q1-2 on P137 and went though them together.
Homework
Take two ice cubes. Put one on the base of an upturned pan (do not heat the pan at any point - just use a pan straight out of the cupboard), and the other on a chopping board made of wood or plastic. Observe for 5 minutes.
Optional extra: get a free time-lapse app for your phone and make a time-lapse video of the process. Prop your phone up so it doesn't move - if you hold it your video will be wobbly. Post it on Yammer so we can watch it next lesson. Credits for anyone who does this. Make sure you appear in the video at some point so I know you haven't just downloaded it from youTube!
Research one use of bimetallic strips - minimum half a side of A4, maximum 1 side A4 (including pictures).
Hand in before next lesson.
Specific latent heat
Classwork
We went over specific latent heat of vaporization and fusion (see this video).
We finished off the second half of this worksheet and went through almost all the answers together - I will try to go through the last few parts at the start of next lesson.
If you want to read more about gold on astronaut visors then look here, although this page will make a lot more sense to you once you have learned about the electromagnetic spectrum.
Homework
This is entirely optional - get a timelapse app for your phone (there are plenty of good free ones for iPhone and Android) and make a time lapse video of clouds or the sun setting or the moon rising or anything you want. You could even post it on Yammer so we can watch it next lesson.
No lesson due to house sports competition.
No lesson due to NHM trip.
Specific latent heat
Classwork
We made some notes on specific latent heat of vaporization and fusion - if you missed the lesson watch this video and see P.132-133 of the textbook.
Homework
Do Q1-3 of this worksheet and hand in on Monday morning.
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.
Specific heat capacity
Classwork
We corrected the cover work and started the questions on P129.
Homework
Do Q1-2 on P129 and hand in on Monday.
Cover lesson
Classwork
Please read P130-131. Answer Q2 on page 131 - you will need graph paper for this.
Complete both sides of the "Specific Heat Capacity" worksheet - I will post the answers online later for you to check if you like - please pay attention to detail with units. Energy should be in joules, and mass in kg.
Use P128-9 to help you.
Update: the answers to the worksheet are here and here
Heating and cooling curves
Classwork
We made notes and did examples of heating and cooling curves involving changes of state, and did a difficult example of a salt water heating curve.
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 went through last week's cover work and drew up a table of the behaviour of particles in solids, liquids and gases.
We collected some data and plotted a heating curve of water being heated from room temperature to boiling. Half the class used tap water and half used salt water.
Next lesson we will compare these graphs to your predictions made during the cover lesson.
Newton's Third Law
Classwork
I gave you some test feedback, then we looked at Newton's Third Law.
Homework
Watch this video about Newton's Third Law. It shows you another misconception (like the Year 8 misconception about gravity) that many people hold.
Search on YouTube and try to find another useful video about Newton's Third Law that helps you understand what we talked about this lesson. Be ready to share any good videos you find next lesson.
Cover lesson
Classwork
I am not here today. Here's your work.
1. Go through your test on your own. Use your notes and textbook to correct as much as you can - use a different colour. Make sure you bring your test to next lesson - we will go through it then.
2. Read P126-7 and make notes. Answer Q1-3 on P127.
3. Imagine a beaker of water from the tap is heated strongly by a Bunsen burner for 10 minutes. Draw a graph with temperature on the y axis and time on the x axis to show how you think the temperature of the water will change over that time. Label your axes with important numbers.
Bring all your cover work to next lesson.
Test
Classwork
We did the test.
Homework
No homework.
Topic Recap
Classwork
We did a revision quiz to test our understanding of the topic.
