-
Coming soon…
Fascinated by counting how many drips of one liquid have to be mixed in another before the mixture changes colour? Realised that sneezing on a petri dish is a dream come true? Coming soon, support for the lesser sciences! See blog post for details.
-
-
Badges!
If you see me out and about and recognise me, please do come and say hello and if I’ve got some of these badges in my pocket I’ll give one to you.
-
Easter revision sessions!
Last year I ran very successful revision sessions for A-Level and GCSE/IGCSE Level Physics, so I am doing the same this year. If you want to participate, you can find details and sign up following the links below: For GCSE/IGCSE Level: https://physicswithkeith.com/gcseeaster2024/ For A-Level: https://physicswithkeith.com/aleveleaster2024/ The sessions are interactive, and cover important exam technique andContinue…
-
Deriving the speed of light from Maxwell’s Equations
I thought it’d be good to show my A-Level students how to model an electromagnetic wave using a sinusoidal wave function for the electric and magnetic fields, and how these can be substituted into Maxwell’s Equations to derive the speed of light. There are a few ways to derive the speed of light from Maxwell’sContinue…
-
The visit to CERN
Over the half term I ran a school trip to CERN in Geneva. I’ve run the trip many many times now. This time, however, I ran the trip whilst suffering from bronchitis! With fistfuls of cough sweets and antiinflammatories, I got through it. While I was there, I decided to do a few live streams.Continue…
-
The end of half term
Today’s the end of the half term, so I need a break. I won’t be blogging every day, but I’ll try to post some stuff during my school trip to CERN. As a parting gift before our short recess, here is the simple pendulum time period equation derived using Lagrangian mechanics. I’ve also managed (atContinue…
-
The unboxing of my new HP 15c Collector’s Edition calculator
Happy Valentine’s day to me! I treated myself to a calculator I’ve wanted for many years, a HP 15c (well, the collector’s edition version. I cannot justify the price tag of the original) Below I have embedded my unedited unboxing video.
-
Doing the same thing
In a Year 12 lesson on Tuesday I realised that I was asking the students to perform a simple experiment they’d done twice before: once in Year 7 and once in Year 10. Of course, this time around it was to be more complex because we were going to use light gates, but still theContinue…
-
A line of best fit can be curved to be straight
I’ve heard that teachers of mathematics tell their students that a line is always straight, and so a line of best fit is always straight. I’ve heard that teachers of mathematics say that there are also curves of best fit, but that these are not lines, because they are not straight. Consider a graph showingContinue…
Physics with Keith
Interactive online physics tuition for GCSE/IGCSE and A-Level students (and equivalent) by an experienced and qualified physics teacher.
Social Media
Ⓒ 2026 by Keith Dalby
Physics with Keith 