Depending on how you draw the line of best fit, the speed works out to be about 300m/s which is not terrible - the speed of sound in air is really 330m/s.
The gaps in the graph were for people who I could't see when they lifted the paper accurately so I left them out.
Homework
Asnwer Q1-3 on P52 and hand in on Monday morning before registration.
You may need to read some of the preceding pages in the textbook.
Introducing Pressure
Classwork
We went through the test on light from last term.
We recapped on forces, and started to make some notes about pressure.
We investigated what can happen when a ray of light passes through a triangular prism.
We made notes on dispersion and total internal reflection.
Homework
Revise for a short test on light next week - what you need to know is here.
Refraction
Classwork
We investigated the refraction of light through a perspex block.
Homework
Watch this video up to 8:38. This recaps on everything we have done so far, so there is no need to take extra notes, but you are welcome to add to your notes if you like. It also introduces dispersion which will will soon learn more about.
Also, please learn the colours of the spectrum in order before next lesson - there will be a quiz.
Reflection
Classwork
We investigated the reflection of light from a mirror and found that the angle of incidence equals the angle of reflection.
Homework
Homework is on Yammer - your task is to create a video demonstrating refraction.
Light
Classwork
We made some notes on the speed light travels and about light travelling in straight lines.
We built and tested a pinhole camera, and tried modifying it in different ways.
We did not make as much progress as we might have done under ideal circumstances - please reflect on this for next lesson.
Homework
Read P34-36.
Answer Q1-3 on P37.
Hand in Monday morning before registration.
Test Feedback
Classwork
We went through the test.
We did an experiment to find out which materials can affect a magnetic field.
We introduced the next topic - light.
Homework
Use your phone or a digital camera to take a picture or a video of something interesting happening with light.
The group is closed and I have added you to it, except A.M. A.S. and O.S. because I could not find you on Yammer. If you three can join Yammer over the weekend I will try to add you to the group next week.
Test
Classwork
We did the test.
Homework
No homework.
Relay and Electric Bell
Classwork
We looked in detail at a relay and an electric bell, and answered questions about how an electric bell works.
We went over a few areas of difficulty before next week's test.
Homework
Revise for an end of topic test on magnets next week.
Uses of Electromagnets
Classwork
We went through the homework, and then built and tested loudspeakers.
We discussed how loudspeakers work, and considered ways to make them louder.
Homework
Watch this video which demonstrates a relay switch in action.
Watch this video which explains how relay switches work in a bit more detail.
We will demonstrate a relay switch next lesson, and also look at the electric bell and how it works.
