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A well planned site with lots of informations in Physics!

Vinita Sharat, The Shri Ram School, India

I was new to teaching IB and moved to a brand new school with no other Physics teacher and no resources at all... With the huge help from the InThinking Physics site I was able to put in place a course with no problems at all. It has been like having...

Graeme Keer-Keer, Alcanta International School, China

InThinking site for IB physics is a wonderful resource to learn and teach IB physics effectively. I have been trained mostly through Chris Hampers' ideas and innovations on this site. I couldn't have made it without this resource. Thank you for making...

Sarika Dudeja, The Heritage School, India

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The big bang

10 September 2019

The PhET simulation is great but you can't beat real balloons for introducing electric fields. This year I bought extra big ones, not so good... more

Going to extremes

10 September 2019

Doing measurement of g by dropping a ball using the Pasco kit. Thought it might be an idea to try with the longest drop possible... more

Subscriber comments


  • 15 Sep Amtul Qayyum
    Paper 2
    Chris, thanks! This section is a great help.
  • 12 Sep Frank Ansari
    Paper 2
    This section is especially useful. When I was teaching GCSE, the syllabus booklet included 'verbs' and the expectation that went with each. IB however, does not publish such a list. I try to emphasize this aspect but my list is quite brief....
  • 11 Sep Chris Hamper
    Test: Electrical power (2)
    Oops, it looks like I have written the answers to b and c the wrong way round. I'll correct it in a minute.
  • 10 Sep Fergus Gray
    Test: Electrical power (2)
    Hi Chris. Just checking the answer to 1(b). I thought the power dissipated inside a battery was due to the current flowing through its internal resistance. P=I^2r=(0.086)^2*(5)=0.037W. Is this wrong?
  • Makes sense with a lot of data. OK I'll change the answer.
  • The even/odd rounding rule comes from statistical analysis. I was also confused when I first heard of it from a student. When analyzing large data sets, trends tend to err upward when always rounding 5 up to the next digit. If you alternate...
  • 6 Sep Chris Hamper
    Ideas for investigations
    Yes although any thermometer is probably ok.
  • 5 Sep Amtul Qayyum
    Ideas for investigations
    Thanks Chris. Should he use a thermo-couple to measure the temperature?
  • Well you learn something everyday. Never heard of this even number rule before, interesting.
  • Continuing my above comment, I would add that when I performed the calculation, calculator display answer came as 0.024975025. Here the 2nd sig.fig is 4 not 5. So, the correct answer should be 0.02, even by applying simple rule (without realizing...
  • Hi Chris, I would agree with eric. Because if there are no figures after the 5, then the last figure kept should be unchanged if that last figure is even. Check following references: Well, I agree that this distinction of consideration between...
  • 3 Sep Chris Hamper
    Ideas for investigations
    Type of paint is difficult to quantify, area painted white might be better. Could make a model with a black ball in front of a lamp and see how the equilibrium temp depends on area painted whit. Streets in LA is nice context.

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Higher Level Physics

Higher Level Physics by Chris Hamper. Comprehensive coverage of the entire HL course.

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