national 5 exam questions – electricity and energy

Here are the exam-style questions to cover the electricity and energy unit.  I have included a copy of the relationships (equation) sheet and some data tables that you may need to attempt all the questions.  Apologies for the larger file size, it’s due to all the circuit diagrams.

Use the link below to download your own copy.

the challenge of mars

“We choose to go to the Moon in this decade and do the other things, not because they are easy, but because they are hard.” – President John F. Kennedy (12th September, 1962)

It’s 45 years since the success of Apollo 11 and nobody has tried to send a person further away than the Moon.  Why is that?

It turns out there are many challenges to be overcome if we want to send astronauts to another planet, e.g. Mars.  Earlier this year, the BBC Horizon programme looked at the issues.  Here is the episode. I have split the film into three parts.


mission to Mars – part1 from mr mackenzie on Vimeo.

mission to Mars – part2 from mr mackenzie on Vimeo.

mission to Mars – part3 from mr mackenzie on Vimeo.

Use the link at the end of this post if you want to download a copy to watch later.

national 5 – satellites

We’ve started looking at telescopes and this BBC programme from 2 years ago featured the replacement for Hubble, the James Webb Space Telescope.  The presenter, Maggie Aderin Pocock now hosts The Sky at Night on BBC4.

Please take some time to watch both parts of the film.  Maggie covers the basic idea of satellites, how we achieve geostationary orbit, looks at examples of Earth observation and the manufacture of the James Webb’s massive 6.5m mirror.  In part 1, around 17 minutes in, you’ll see satellite footage over the Highlands, can’t quite see Thurso though.

Satellites-part1 from mr mackenzie on Vimeo.

Satellites-part2 from mr mackenzie on Vimeo.

 If you want to download a copy of the video to watch later, use the download link below.  Please be patient, the file is about 660MB in size.

S4: work done, potential and kinetic energy

We finished the transport section with a look at Work, Potential & Kinetic energy.  Those of you aiming for Credit need to carry out calculations involving kinetic energy using

E_k = \displaystyle {1 \over 2}mv^2

Here is a video about work, potential energy & kinetic energy from Bozeman Science

Most of the calculations will be based on the principle of conservation of energy.  Dr. Altman has an excellent series of videos examining conservation of energy  examples from Roadrunner cartoons.

I have attached a pdf handout with worked examples on potential energy, work and kinetic energy.  If you want some more revision materials, try here.