I showed you the light bulb that I ran really hot last lesson. The inside of the glass bulb was coated in a thin layer of tungsten metal which was shiny, especially when I broke the bulb and we looked at the inside of it.
I demonstrated a few more things with levitating bits of aluminized plastic, and we added to our notes.
Homework
Research one danger of sparks arising from static electricity.
Max 1 side A4. Due Friday morning.
Going through exam
Classwork
We went over the end of year exam.
I demonstrated this toy and we started to look at quite a lot of the physics involved in making the metallic coated plastic and also how it levitates.
We started to make notes on static electricity.
The stuff we will be learning in this topic can be found here and here.
Circuits revision
Classwork
We did a kahoot quiz that had a few extra bits that you don't need to know about (but they are interesting).
You did some past paper questions - we went through about half of them and the answers are at the end of this pdf if you want to check the rest.
I've removed Q4c) as you haven't learned about that yet.
Efficiency
Classwork
You did a long question about a crane that recapped on ideas about work and power and led onto ideas about efficiency.
We went over the two formulae for efficiency and showed that they are equivalent.
We looked at a few electrical appliances and tried to identify useful energy output and wasted output.
We discussed 'wasted' energy again.
We played MFL articulate.
REMINDER: no test for this topic now - we will just work through some questions in class.
Spring Energy
Classwork
We made notes on the formula for spring energy, then did quite a few tricky calculations.
We looked at situations where a spring fires an object (or the spring itself) and calculated the speed it is fired at and the height it might reach.
We then did this for a real spring, and it almost reached the predicted height (although not quite due to friction and air resistance).
Next lesson we need to do energy efficiency, then we are pretty much finished with this topic.
Power, Springs
Classwork
I gave out the revision list for the end of year examination.
We finished off the questions from last lesson found here.
We derived the formula: power = force x speed which can be useful.
We tried to observe the transit of Mercury using a pinhole. See this demonstration which shows a pinhole being used to observe an eclipse. The greater the distance between the hole and the screen, the bigger the image of the sun will appear.
We made notes on springs and their uses, and calculated the spring constant of two different springs.
Power
Classwork
We went through the questions on P41 and discussed counterweights on car park barriers.
We agreed to do a test on energy on Weds 18th May.
Bank Holiday
Work and energy - examples
Classwork
We made notes on "work done" (for those who missed the lesson) and did an example calculation for dragging a box across a desk.
We discussed and made notes on the energy that is 'wasted' as heat by friction in most systems.
We also discussed 'heat engines' which are not on they syllabus, but are interesting. For theory on heat engines watch this and for examples see Hero's Engine and the Stirling Engine.
Homework
If you missed the cover lesson, please read P40-41 and answer the quetions on P41. Bring to next lesson.
Then next lesson we can go through these and everyone should be in the same place.
Cover Lesson
Classwork
You marked and went over the sheet on rollercoasters.
You made notes on "work done" and answered the questions on P41.
Homework
Watch the first half of this video - stop when he starts talking about asteroids.
Add to your notes where necessary.
Rollercoasters
Classwork
We went through the waves test and discussed ways of checking whether two things are proportional to each other.
You made notes on the dangers of different parts of the EM spectrum.
You made notes on ionizing radiation, and which parts of the EM spectrum are ionizing.
We looked in a bit of detail at how x-rays are used to image broken bones.
I told you that we will be doing a test on waves in the last week of this term.
Electromagnetic Spectrum
Classwork
I showed you this video about the electromagnetic spectrum.
You did some research on the electromagnetic spectrum:
What is the electrmagnetic spectrum?
What are the parts of the electromagnetic spectum in order?
Find three uses for each part of the parts of the elecrtomagnetic spectrum.
Find five similarities and five differences between different parts of the E-M spectrum.
Homework
Answer Q1-4 on P79.
Hand in tomorrow morning before registration.
Waves calculations
Classwork
We went over the questions you did for HW.
I noted the importance of laying your work out clearly, and showing units in your working.
I demonstrated laser light diffracting through a narrow slit, and we discussed the focussing of water ripples, light, sound and radio waves using curved reflectors.
We went over Newton's First Law, which you made notes on for HW.
We pretty much worked out intuitively what Newton's Second Law would be.
We did some simple calculations using F = ma for a man and a boy pushing a trolley and a car.
You answered the questions on this sheet and we went through everything up to Q6 on NII.
More tangents
Classwork
We did this sheet. The ideal answers were: 2a) 0.8m/s, 2b) 2.2m/s, 4a) -3m/s², 4b) -18.75m/s², 5) 6075m
We went through Q1 on P11 together (the one about the oil drops).
Homework
Make notes on Newton's First Law using this video and P14 of the textbook.
Bring your notes to next lesson.
Graphs and formulae
Classwork
We wemt through the HW in detail - it was quite tricky.
We learned a new formula for acceleration: a = (v-u)/t
We practised a few examples of using the formula, then did Q6 on P10 and Q1-2 on P11. I also gave out this sheet which we can do at the start of next lesson.
Remind me to go through Q1-2 on P111 next lesson.
Tangents, terminal velocity
Classwork
We finished off this sheet and learned how to calculate the gradient of a curve at a point using a tangent.
We discussed what would happen if an object fell from a great height, then used a slow motion camera to investigate a paper shape falling.
We will make notes on terminal velocity next lesson.
Homework
Answer Q2-4 on P10 and hand in tomorrow morning before registration.
For Q3 you can draw a tangent *very lightly* on the book in pencil, then rub it off afterwards.
We then started to make notes on what the area under a speed-time graph represents.
Homework
Watch this video from 7:01 to 9:15 - this shows how to calculate the area under a more complicated speed-time graph. Add to your notes that we started in the lesson.
The gradient of a speed-time graph gives you the acceleration in m/s².
Watch the same video from 1:50 to 5:15 and make notes on this.
We will do examples of these next lesson.
Velocity, speed-time graphs
Classwork
We quickly went over the HW.
We made some notes on displacement and velocity.
We started to interpret speed-time graphs, and translate between distance-time graphs and speed-time graphs.
We will do more on this next lesson.
Displacement-time graphs
Classwork
We calculated the average speed of a jouney from a distance-time graph.
We started to make notes on displacement-time grahps, and how they differ from distance-time graphs.
We acted out a few displacement-time graphs, and saw that the gradient of a displacement-time graph can be positive or negative.
Homework
Complete both sides of this worksheet and hand in tomorrow morning before registration.
Distance-Time Graphs
Classwork
We went through some basic expectations.
We acted out some distance-time graphs, and made notes on the features of distance-time graphs.
We practised calculating the gradient of parts of distance-time graphs to calcuate speed.
We looked at a few things that are not allowed on distance-time graphs because they are impossible.