Stability and centre of mass - work for Friday 8th March

Use the idea of centre of mass, forces, moments and stability to answer the following questions.  Bring your answers ready to discuss next lesson (Wednesday).

Why are you more likely to fall over if you are wearing high heels

Why are wedge heels more sensible than stiletto heels?

What is the most stable position for a human?

Why do tall people tend to have bigger feet?

Why is a double decker bus less stable if the top deck is full of people?

Resolving forces in equilibrium ISA practice

The first two questions will be useful for the exam on Friday, ignore the reference to Newton's Laws.
Questions
http://www.scribd.com/doc/127534808/3-force-equilib-feb-13-rtf?secret_password=2bnvxl4unlishoerauvr

Markscheme
http://www.scribd.com/doc/127534805/3-force-equilib-feb-13-markscheme-rtf?secret_password=i7gay2ppwrbr1j7jly8
If you get stuck and others in the class can't help, please come and ask me!
Thanks
Ms H

ISA practice questions – the answers for light gates and electronic timer expt.

ISA practice questions – the answers for light gates and electronic timer expt.

1.       Independent is angle, dependent is velocity

2.       + or – 0.02 (1/2 range)

3.       + or - 1.77%

4.       1^st row 2.88, 3.13, 3.33 then 2^nd row b8.29, 9.82, 11.07, last row 0.530, 0.616, 0.707

5.       + or – 1 degree

6.       0.05 m/s

7.       0.75%

8.       Row for 15 and 15 degrees have the smallest range

9.       At largest angle = 0.75%+ 0.75% so 1.5%

10.   Plot accurately!

11.   V² is directly proportional to sinѲ, straight line that goes through the origin

12.   Mark for 8cm minimum gradient triangle drawn, mark for correct values, answer for gradient should be 15.7 , allowance of + or – 0.3, 2 or 3 sf only

13.   See markscheme for this paper on March 2012 blog post, ISA is PHA3T Q10

ISA preparation again

As well as the links under Feb 2012, you can also access all past ISA papers since 2009 at the link below

http://web.aqa.org.uk/exams-office/exams-guidance/qp-ms_finder.php?id=01
Choose A level GCE, Physics A in the drop down menus.

The ISA papers for year 12 areUnit 3T and will be called P11, Q11 etc - there are two for every year.  The unit code is, for eample for 2011 PHA3T/P11 and PHA3TQ11 and there are task sheets, teacher notes, papers and marking guidance available.

The most recent ISA papers from 2012 will be appearing shortly, as will the anwers to the questions done today in class.
Thanks and see you on Tuesday after school :)
Ms Hamnett

ISA practice papers - homework

Half term homework is to finish the table graph from Friday's practice ISA ,and to attempt one of the other ISA papers uploaded on this blog but NOT p11 - look under February/March 2012 where there are 4 past papers, markschemes and task sheets. 
Come to the first lesson back with table, graph and any queries you have.

Upcoming Physics events - discovering planets from your sofa and much more

The next three Physics events at the Physics department are detailed below, booking is now open, hope to see you there!

http://www2.physics.ox.ac.uk/events

How to discover a planet from your sofa, and other adventures.

Date: 11 Mar 2013 - 6:00pm - 7:00pm

Venue: Martin Wood Complex, Department of Physics, University of Oxford, Parks Road, Oxford, OX1 3PU

Audience: General public (Age 12+)

Oxford astronomer and BBC Sky at Night co-presenter Chris Lintott invites you to the magical world of the Zooniverse, where you can discover planets, explore distant galaxies and even travel on World War 1 ships without leaving your browser. The Zooniverse is the world's most popular collection of citizen science projects, which use the power of human pattern recognition to help scientists deal with millions of images and gigabytes of data.

Neutrino - the invisible messenger

Date: 18 Mar 2013 - 6:00pm - 7:00pm

Venue: Martin Wood Complex, Department of Physics, University of Oxford, Parks Road, Oxford, OX1 3PU

Audience: General public (Age 14+)

Neutrinos are the most abundant particle in the universe and yet very little is known about them. They have no charge and are at least ten millions time lighter than the electron. They see almost all matter as transparent as vacuum which makes them very difficult to study. Without the existence of large source of neutrinos like the sun, cosmic rays or man-made nuclear reactors we may have never known about them.

Date: 19 Mar 2013 - 6:00pm - 9:00pm

Venue: Denys Wilkinson Building, Department of Physics, University of Oxford, Keble Road, Oxford OX1 3RH

Audience: General public (Age 8+)

Stargazing Oxfordshire - Astronomy Evening

Find out more about research in astrophysics from professional scientists, and observe the night sky with your local community astronomers.

Mars Lecture - Monday 4th Feb 6pm, free

Milankovic on Mars

Date: 4 Feb 2013 - 6:00pm - 7:00pm

Venue: Martin Wood Complex, Department of Physics, University of Oxford, Parks Road, Oxford, OX1 3PU

Room: Martin Wood Lecture Theatre

Audience: General public (Age 14+)

The surface and atmosphere of Mars continue to be the target for intensive exploration by robotic spacecraft such as NASA's Curiosity Rover and Mars Reconnaissance Orbiter, and the results are being modeled in increasing detail using sophisticated numerical models, much like the ones used to predict climate variability on Earth - with Oxford playing an important role in both kinds of activity. It now seems clear that, as on Earth, the Martian climate is very dynamic and continually changing and evolving, at least partly in response to cyclic changes in the planet's orbit and rotation on millennial to million year timescales. This is much like the orbital cycles on Earth that control the onset of ice ages, discovered by Milutin Milankovic in the early 20th century. In this talk we will explore the evidence for geologically recent and fairly extreme climate changes on Mars, examining the implications for where water (thought to be essential for any prospect of life) resides in the Martian environment, both now and in Mars' past and future.

Mini bio

Peter Read is a Professor in the Department of Physics, and Fellow and Tutor in Physics at Trinity College, University of Oxford, UK. In the Department he is currently Head of Atmospheric, Oceanic & Planetary Physics, which is one of the six sub-Departments within Oxford Physics.