Physics HW Ms H

Q1.          (a)     State Newton’s law of gravitation.

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(2)

 (b)     In 1798 Cavendish investigated Newton’s law by measuring the gravitational force between two unequal uniform lead spheres. The radius of the larger sphere was 100  mm and that of the smaller sphere was 25  mm.

(i)      The mass of the smaller sphere was 0.74 kg. Show that the mass of the larger sphere was about 47 kg.

density of lead = 11.3 × 10³ kg m^–3

 (2)

(ii)     Calculate the gravitational force between the spheres when their surfaces were in contact.

Exam Technique workshop - twilight session THIS THURSDAY

Dear Year 12 Physicists,

We are very lucky to have a lecturer and tutor from Oxford Uni running a session on problem solving and exam technique this Thursday (18th May) from 3-4pm.

This session will give you more opportunities to practice exam questions, and will also look at strategies for when you don't know what to do in exams!

All Year 12 Physics students are expected to attend.  See me in advance if there is a problem with this.  (12e, this session will replace Tuesday's twilight session)


Dr Spence

Easter HW MS H

Rsearch method of measuring g
Finish refraction questions
Try projectile simulation below

Have a play with the simulation tyo get a feel for projectiles
https://phet.colorado.edu/sims/projectile-motion/projectile-motion_en.html
Happy Easter!

Y12 girls Physics problem-solving day (free)

Calling all Year 12 girls thinking about Physics at University (can't work out a way to send individual messages on Edmodo...)!

APPLY BEFORE APRIL 5TH:
Oxford Physics department are running a FREE Y12 girls problem solving day on Friday 21st April.  The day involves workshops, meeting Physics undergraduates and researchers, trying some undergraduate practicals, and advice on applying to Oxford Uni. It will be fun, useful, and incredibly beneficial for UCAS applications!

Follow the link below to apply BEFORE 5TH APRIL.  Only a few spaces left, and priority will be given to local schools.

https://www2.physics.ox.ac.uk/my-forms/year-12-girls

Any questions, contact Dr Spence

HW set 30th March Ms Hamnett

HW for this week
Draw and annotate sketch graphs of a skydivers motion s-t and v-t
Do ten more waves questions from the booklet (some of you now owe me 20..)
Thanks
Ms H

Cover for Friday P2 Ms H

 Cover for tomorrow as I am away, it is from your Physics text book;

1.     P100 questions on refraction

2.       Exam style Qs P108-110

3.       Make notes on optical fibres and uses of TIR (from book or other sources)

Thanks

Ms H

CERN participants - passport copy needed ASAP

To all those coming to CERN this year - I need a copy of your passport photo page by Monday so that I can book flights, please bring this in to Dr Hardwick by Monday.  To book the flight we need your name exactly as it appears on your passport, and we will need various other details from it to finalise the booking - if you are in the process of getting a new passport or it has expired, please bring your full name as it appears on the passport to Dr Hardwick. You will need a valid passport for the trip.
Thanks
Ms H

Cover work for Ms Hamnett Thursday and Friday

Dear Y12
Sorry I am not in, have bronchitis, recovering and should be back to normal next week.
Work for today and tomorrow's lessons;
1. Young's double slit experiment - read about this in your textbooks and make notes including diagrams on what the experiment was, what his explanation was of the observations, why this was significant and what the equation is to describe this.  Do the relevant questions from your textbook on this section.
2. Diffraction gratings - describe what these are, read the relevant part of your textbook and make notes, including the equation and what it means, how the pattern is formed,with a laelled diagram to show this, why the central maxima is brightest, and how to derive the equation.  Do the relevant questions from your textbook on this section.
3. Plan an experiment to test the relationship given by both these equations using standard lab equipment - this is your next required practical which we will be doing next week.

Thanks and see you next week
Ms H

Cover work for Ms Hamnett - links to revision workbooks

Dear all
Sorry I am ill today
Have uploaded the workbook questions to google drive so you can all access them, they are being printed as well and Dr Spence or Dr Hardwick may have the printed copies or part of them but if not please use them for revision for your mock - be aware you won't be able to answer all of the waves stuff yet
Particles and radiation https://drive.google.com/open?id=0B_-6rEo3ljnVZDB0MXQxZzNMZ28

Waves
https://drive.google.com/open?id=0B_-6rEo3ljnVZlpBM0tOZVRjTXc

Thanks
Ms H

Req prac work for Ms H due Friday 2nd Feb

How does the frequency affect the wavelength on a stationary wave?

·         Collect a set of results from the signal generator and rubber cord to investigate this.

·         Repeat your readings to get a mean for each wavelength.

·         Draw an appropriate graph for your results.

·         What is the gradient of your graph?  Calculate this and work out what the gradient represents.

Required practical write-up

·         This needs to follow the instructions and guidance on the sheet and include error analysis – (working out the uncertainties and percentage uncertainties and commenting on them) and a graph with error bars.

·         You may need to use the mass of the wire to work out the mass per unit length (1.5m of wire weighs 1.46g) for comparison.

Additional tips:

·         Uncertainty of a mean value = 1/2 range

·         Percentage uncertainty of a mean= 1/2 range/mean x 100.

·         Uncertainty of a single value = precision

·         Percentage uncertainty of a single value – precision/value x 100

12a cover work Ms Hamnett

I am absent Friday 20th Jan - please can you

• complete the work as detailed on previous blog post, 
• finish your standing waves extended writing task 
• watch the video here https://www.youtube.com/watch?v=1yaqUI4b974
• and research what is the relationship between frequency, mass per unit length and tension in a string forming a stationary wave at the first harmonic in preparation for your required practical next week 
• All due Thursday 26th January Thanks, Ms H

12a HW for Ms Hamnett

Demonstrating wave effects

Use the microwave kits to demonstrate the following effects and write a brief report about each one, explaining what you observed and how it demonstrates each effect, using as many key words as you can (within reason).

Transmitting and receiving microwaves

Reflection

Diffraction

Polarisation

Stationary wave (will have maximum and minimum amplitude at certain points along the line from transmitter to reflecting surface, move your receiver)

Bring this and your questions completed to the lesson on Thursday 19th Jan