# GCSE Physics 9-4

• ### Classwork

• We did the examples on the first page of this using scale diagrams on graph paper.
• You did it very well.
• We then started to go thorugh the HW and got up to question 4 a). We will go though the rest next lesson.
• ## Graphs of Motion

• ### Classwork

• We went through the test on circuits.
• I gave out the list of stuff you need to know for the end of year exam.
• We did this task and went through it:
• A teacher paces backwards and forwards across the classroom twice. They walk at a constant speed of 1m/s. The room is 5m wide. Draw:
• a) a displacement-time graph
• b) a velocity-time graph
• c) a distance-time graph
• d) a speed-time graph
• We started these exam style questions.
• ### Homework

• Finish off the exam style questions and bring to tomorrow's lesson.
• ## Test

• ### Classwork

• We did the test.

• ## Filament Bulbs

• ### Classwork

• We made some notes on filament bulbs - how they work and why the resistance increases with temperature.
• I demonstrated a carbon filament glowing when a current flowed through it, and the carbon oxidizing due to oxygen in the air.
• ## Circuit Rules

• ### Classwork

• We went through these circuit rules.
• We did these questions and went through Q1-2 together. We will go through Q3 and 4 next lesson.
• ### Homework

• No homework, but please make a note that there will be an End of Topic Test on this stuff on Tuesday 5th May.
• ## Recap questions, LED

• ### Classwork

• We did some recap questions on the material we have covered so far.
• We added to our notes on the diode to include the LED, and I demonstrated a string of LEDS only starting to conduct at a particular voltage.
• ### Homework

• Answer Q2 and Q6 on P174 and hand in tomorrow morning before reg so I can mark them for the lesson.
• ## Thermistor, LDR, Diode

• ### Classwork

• We experimented with thermistors and saw how their resistance changed with temperature.
• I demonstrated the changing resistance of an LDR in different light conditions.
• We added to your notes with examples of electronic items that might use thermistors or LDRs.
• We made notes on the diode and its voltage-current graph.
• ## Voltage-current graphs

• ### Classwork

• We did a practical and plotted voltage-current graphs for a bulb and a resistor.
• We then looked in more detail at the graphs for a bulb and a resistor, including negative voltages, and made notes.
• I demonstrated the V-I curve for a diode - more on this next lesson.
• ### Homework

• Read and make notes on P168-9 - in particular about thermistors and LDRs since we haven't talked about these yet.
• Answer Q1 on P169 and bring to next lesson.
• ## Measuring Resistance

• ### Classwork

• 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

• 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 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.
• ## Test

• ### Classwork

• We played a game of bingo to recap on key ideas.
• We did the test.
• ### Homework

• No homework.

• We examined a vacuum flask.
• Watch this video if you missed the lesson.
• ## Tin can experiment

• ### Classwork

• We planned and carried out an experiment similar to that on P144.
• ### Homework

• Revise for test next Monday on this stuff.
• ## Thermal radiation - surfaces

• ### Classwork

• 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.
• We added to our notes from last lesson.

• ### Classwork

• We did a starter question to recap on adding forces.
• We made notes on thermal radiation, and felt the thermal radiation from a hot sheet of metal.
• ### Homework

• Answer Q3 on P145 and bring to next lesson.
• Here is a short video of an infra-red sensor being used.
• 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

• 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.
• ## Thermal expansion

• ### Classwork

• We did the ball and ring experiment and heated a bimetallic strip.
• We made some notes on the thermal expansion of solids.
• ### Homework

• Think of a use for bimetallic strips, other than for fire alarms and turning air conditioning on and off.
• ## Rate of evaporation

• ### Classwork

• WE Looked at your graphs and considered the conclusions that could be drawn from them.
• We made some notes on the factors that affect the rate of evaporation of a liquid.
• ## Cooling by evaporation

• ### Classwork

• We discovered why evaporating liquids cool things down, and investigated the cooling effect of different liquids under different circumstances.
• If you missed the lesson, watch this video.
• We collected some data to calculate the specific latent heat of fusion of water - we will use this next lesson to complete the calculation.
• ### Homework

• Plot both graphs on the same axes and write a short conclusion (do that on the graph paper).
• Bring to next lesson.
• ## Specific Latent Heat of Fusion & Vaporization

• ### Classwork

• We did these questions about specific latent heat.
• 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.
• ## Specific Heat Capacity

• ### Classwork

• We did some questions on specific heat capacity - we will go through the last few questions next lesson.
• 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

• 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.
• We answered these questions on Newton's First and Second Laws and went through the answers.
• ## Newton's Second Law

• ### Classwork

• We introduced Newton's Second Law (F = ma).
• We did a few calculations, then did a practical to measure the acceleration of a trolley.
• ### Homework

• Plot a graph with force on the x-axis and acceleration on the y-axis. Hand in tomorrow morning before registration.
• ## Scalars and Vectors

• We went through key ideas about scalars and vectors from the homework.
• We finished off the second page of the parallelogram method worksheet, and considered adding velocities for aeroplanes flying in crosswinds.
• ## Parallelogram Method

• ### Classwork

• We went through lots of examples of adding forces and displacements using this worksheet.
• ### Homework

• Watch and make notes on this video about scalars and vectors (it mentions momentum at the end - you don't need to worry about that till Y11).
• Make sure your notes include the table of scalars and vectors in your notes.
• Bring your notes to next lesson.
• ## Resultant Forces

• ### Classwork

• We went over key ideas from the homework
• I introduced the parallelogram method for adding two forces at an angle to each other.
• We will practise this more next lesson.