Bring your marked work and any questions you have to tomorrow's lesson.
Graphs of motion
Classwork
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
Homework
Answer Q1-3 on this sheet and hand in BEFORE REG on Wednesday.
Big Bang
Classwork
We did these questions on the Doppler effect and the Big Bang.
We made some notes on what the 'Big Bang' theory states, and the other main piece of evidence for it - Cosmic Microwave Background Radiation.
Homework
I gave out the list of things you need to know for the end of year examination.
Go through this list and highlight areas you want to target in the remaining revision lessons we have.
No lesson - school photo
Hubble's Law
Classwork
We did a revision quiz.
We made some notes on Hubble's law and the evidence that the universe seems to be expanding.
We also spoke about why we are not at the centre of the expansion, even though all galaxies are moving away from us.
Homework
Read and make notes on P122-3, particularly:
What is the big bang? What is the evidence for it? (Hubble's discovery + CMBR)
This video is pretty good - though you don't have to make notes on it as some of the stuff is not on the syllabus.
Doppler effect
Classwork
We went through the test.
I started to demonstrate the Doppler effect using this website.
Homework
Play with the website linked to above. Click the page to start making waves, and click and drag to make the plane move as it emits waves.
Use your phone as a timer, and work out the period and frequency of the waves when the source is stationary. (we won't worry about the wavelength as your screens may be different sizes so this will differ)
Then make the plane move, and put the mouse pointer in front of the plane. Verify that the period of the waves passing the mouse pointer is shorter (and the frequency is higher) compared with when the source is not moving.
Do the same with the mouse pointer behind the plane, and check that the period of waves arriving is longer and the frequency therefore lower.
Then watch this video and make notes on the Doppler effect. Bring notes to next lesson.
Test
Classwork
We did a bingo game and some revision.
We did the end of topic test.
Homework
No homework.
Ionizing radiation
Classwork
We did some recap questions using mini whiteboards.
We went through the uses and dangers of UV, x-rays and gamma rays.
We made notes on ionizing radiation, and on the use of x-rays and gamma rays for radiotherapy.
We went through the homework and discussed terminal velocity in the context of a car accelerating until it reaches its top speed.
Homework
Read P32-33 and watch this video about stopping a car. Make notes on these, and bring to next lesson. The video is a bit annoying, because it uses units of miles per hour and feet, but otherwise it's ok.
We made notes on terminal velocity and watched this short mythbusters clip, though it doesn't exactly include a lot of physics.
Homework
Answer Q1 and 3 on P35 and bring to next lesson.
Also you could optionally investigate the terminal velocities of different animals, and find out more about that spider I mentioned that is carried around the world on air currents because its terminal velocity is so slow.
Crumple Zones
Classwork
I gave you some feedback on the homework, and the ideal exam-style answer.
Remember it is not the change in momentum that matters in this case - it's the rate of change of momentum that determines the force.
We built and tested crumple zones:
Homework
No homework.
Momentum
Classwork
We went through the homework questions.
We made some notes on forces and momentum, and force = change in momentum / time
We did lots of examples of different collisions and answered the questions on this worksheet. IF you missed the lesson watch this video from 6:23 to about 11:30 and see P24-25 of the textbook.
Homework
Read P26-7.
Answer Q1-2 on P25 and bring to next lesson.
Momentum
Classwork
We introduced momentum and made some notes. Watch the first 6 minutes of this video and read P22-23 if you missed the lesson.
Homework
Do Q1-3 on P23 and hand in on Monday.
Test
Classwork
We did some revision, then did the mini-test and marked it in the lesson.
Homework
No homework.
Star life cycle
Classwork
We started to make detailed notes on the life cycle of a star.
Note that the video above is pretty basic - if you want more detail then I recommend this video too.
Going through homework
Classwork
We went through the homework from last lesson, and looked at the different things that can happen to neutrons in a nuclear reactor.
Homework
You need to make notes on the use of control rods and the role of water as a moderator (to slow down neutrons). The textbook and these videos should help you - they also explain how the reactor is used to produce electricity, but you don't need to make notes on that aspect - we'll do that next lesson.
This video gives you a good overview of how a nuclear reactor works, but does not mention water as a moderator. This video says a bit more about water as a moderator - the link skips straight to 2:22 which is when he starts talking about it.
Bring your notes on control rods and the use of water as a moderator to next lesson.
Nuclear Fission
Classwork
We went through a couple of difficult questions from the test. Please ensure you do all your corrections and ask me if there is anything you still don't understand.
We introduced nuclear fission - watch this video if you missed the lesson or need a recap - it's a good video except that every time he says 'atom' you should replace it with the word 'nucleus' - what happens to the rest of the atom (i.e. the electrons) is basically irrelevant.
Homework
Read P222-3 and Answer Q1-2.
Bring to next lesson.
Going through test
Classwork
We went through the test, though quite a few people weren't there.
Homework
No Homework.
Recap + Test
Classwork
We looked at different situations where long and short half-lives are desired, and learned about carbon dating.
Plot a graph of your results (number of rolls on the x-axis, dice remaining on the y-axis).
Find the half-life of your dice, in terms of number of throws (this can be a decimal - doesn't have to be a whole number of throws).
Imagine we did the same experiment again, but the dice had spots on TWO of the faces instead of one. Sketch the shape you would expect for this graph on your other graph with a dotted line.
Do all of this on one sheet of graph paper and hand in on Tuesday morning before registration. Make sure your name is on it.
Read and make notes about how gamma sterilization works using this page (you don't have to make notes about the other methods like ethylene oxide and electron beams, but they are interesting to compare).
Read about a few of the uses of gamma sterilization here - no need to make copious notes on this, but it's interesting to see the variety of applications.