by Stuart Kelly | 26 May 2019 | General
We all have those tit-bits of information that we find hard to remember. I have many, but one that is constantly irritating me is the one that tells you what component of weight acts along the inclined plane and what component acts perpendicular to it? Is it cos or...
by Stuart Kelly | 30 Jun 2017 | Physics
Dear Stuart, Thanks for all the support through this stressful time. You’ve made physics fun & entertaining. Thanks for all the help. Best wishes, Tom Share...
by Stuart Kelly | 21 Aug 2015 | General
Received a text yesterday …. “Hi, Stuart. I wanted to let you know that Leonora got a B in maths and an A in physics so she is super happy! Thanks again for all your hard work with her. Sophie” Makes it all worthwhile. Share...
by Stuart Kelly | 23 Jul 2015 | Physics
So the waiting is finally over. Well, it is, sort of. We have out first images of Pluto, and they are mind blowing. What an amazing achievement to get a spacecraft in the right place to take such amazing photographs. They answer lots of questions, and pose many, many...
by Stuart Kelly | 19 Jun 2015 | Physics
One of the most exciting events ever will happen in just less than a month. On 14th July, the space probe New Horizons will make its closest approach to Pluto. It’ll be moving pretty fast (!) so it won’t have long close to the planet, but it will be...
by Stuart Kelly | 2 Jul 2014 | Maths
Given: a = b Multiply by a: a2 = ab Subtract b2: a2 – b2 = ab – b2 Factorise: (a + b)(a – b) = b(a – b) Divide by (a – b): (a + b) = b Substitute for b: a + a = a Simplify: 2a = a Divide by a: 2 = 1 Clearly, this is impossible. So...
by Stuart Kelly | 13 Apr 2014 | General
This is a classic. Energy = Power x Time So given a question like “How much energy is converted if a 100W light bulb is on for 1 hour?” it’s obvious that you multiply 100W by 1 hour and get the answer 100 Joules. WRONG!! The formula only works if ALL...
by Stuart Kelly | 9 Apr 2014 | General
… thought of my students. An hour with me and I promise your brain won’t turn to mush if you come across a question like this. Share...
by Stuart Kelly | 12 Nov 2013 | Physics
“Poets say science takes away from the beauty of the stars – mere globs of gas atoms. I too can see the stars on a desert night, and feel them. But do I see less or more? The vastness of the heavens stretches my imagination – stuck on this carousel my...
by Stuart Kelly | 9 Nov 2013 | Maths
I just added a sheet of circle theorems. Unfortunately, you just have to learn these, but it’s well worth it. You need to able to spot which theorem to use when you see a question. The best way to get better at this is practice. The more examples you do, the...
