Twin paradox - a good explanation

This link goes into a lot of detail but is useful in deepening your understanding
http://www.phys.unsw.edu.au/einsteinlight/jw/module4_twin_paradox.htm

Links for ISA practice papers

The links below will take you to the four pactice papers, task sheets and markschemes.  Use the analysis sheet on the previous post to identify which bits you most need to revise and work on those over half term.
If it isn't working please let me know
Thanks and enjoy!
Ms Hamnett
P10 ISA marking guidance http://www.scribd.com/doc/81269257?secret_password=jniit12e0oxgo0b1p73
P10 ISA task http://www.scribd.com/doc/81269260/Phy6t-p10-Task?secret_password=1ldpymfagpuz2muhtnyh
P10 ISA test http://www.scribd.com/doc/81269263/Phy6t-p10-Test?secret_password=1u9e6d4g6xix7q549xat

P11 ISA marking guidance http://www.scribd.com/doc/81269265/PHY6T-P11-Final-Mark-Guide?secret_password=g0cqdke62s8sajpwqhp
P11 ISA task http://www.scribd.com/doc/81269269/PHY6T-P11-Task-Sheet?secret_password=3ofuuloadmegof47zws
P11 ISA test http://www.scribd.com/doc/81269276/Phy6t-p11-Test?secret_password=2l9gs23wi430f9irbtw8

Q10 ISA marking guidance http://www.scribd.com/doc/81269278/PHY6T-Q10-MG?secret_password=199pzdw66yi1ujywa0pg
Q10 ISA task http://www.scribd.com/doc/81269280/Phy6t-q10-Task?secret_password=2q31w8pb9c3bisnp2an
Q10 ISA test http://www.scribd.com/doc/81269284/Phy6t-q10-Test?secret_password=150tfhchhyupujonwp5m

Q11 ISA marking guidance http://www.scribd.com/doc/81269286/PHY6T-Q11-Final-Mark-Guide?secret_password=11zqko0v42fbqyhkt8c6
Q11 ISA task http://www.scribd.com/doc/81269292/Phy6t-q11-Task?secret_password=1wbpopuevzaj0kaiaiyp
Q11 ISA test http://www.scribd.com/doc/81269297/Phy6t-q11-Test?secret_password=dk5tp84rrnj9aaio1bg

ISA tips

Past ISA papers to follow later today
Here is the checklist and the uncertainties guide

AQA world ISA guide to calculating uncertainty

1. Is the variable independent (you change it) or dependent (several values and a mean)?
2. For independent variable, uncertainty is + or – smallest measurement on instrument
3. For dependent, plus or minus half the range,
4. Percentage uncertainty independent is precision / value then x 100%
5. Percentage uncertainty dependent is 0.5 x range / mean then x 100%
6. For percentage uncertainty of a calculated value, find the total percentage uncertainty by adding the parts of each calculation together

ISA Analysis

Stage One (graph and table)

What are you losing marks on?

Precision

Units

Calculations

Plotting

Scales

Best fit line

Section A (about your experiment)

What are you losing marks on?

Variables

Accuracy questions

Uncertainties

Section B (related experiment)

What are you losing marks on?

Calculations

Variables

Graph plotting

Gradient calculation

“Theory predicts that…” rearranging equations

Describing another experiment

video link

Relativity video clip which looks useful apart from the annoying voice
http://www.youtube.com/watch?v=HHRK6ojWdtU

Relativity

Find an thought experiment to explain length contraction and be ready to present it next week.
Links to useful websites are in earlier blog entries (March/April 2011