transit of Venus

I set my alarm clock for 4am and was disappointed to find a sky full of clouds that would prevent us from viewing the transit of Venus from Thurso and the surrounding area. 

The BBC Horizon programme broadcast last night was very good.  You can still catch it on iPlayer for the next week or download it using the link below.

how satellites rule our world

BBC2 showed a really good programme about satellites last night.  This screenshot showing a satellite passing over the Highlands is taken from about 17 minutes into the show.  Click on the picture to visit the BBC’s own page about the documentary.

It was quite eye-opening to see just how much modern society relies on satellite technology.

You can download the entire programme using the link below.

AH investigation report

This week is your last chance to submit a draft of your investigation report for proof reading.  I have already given you a copy of the SQA guidelines for candidates.  You might also find the attached uncertainties document helpful.  Pay special attention to the final page; reports that fail to account for calibration uncertainty will be penalised by the external marker.

If you are struggling with uncertainties in Excel, have a look at the two linest documents I posted earlier this year.

beautiful equations

Those of you not out celebrating New Year might have spotted a programme called Beautiful Equations on the BBC schedule.  The programme follows an artist as he asks about five famous physics equations.

One of the featured equations should be familiar to you from unit 1 of the AH Physics course;

F = \displaystyle {{G m_1 m_2} \over r^2}

Hopefully you recognise this as Newton’s equation for the gravitational force between two bodies.  I have extracted the nine minutes or so relating to Newton’s work and embedded it below.

The link below will download the entire programme, which also looks at E=mc^2, time dilation in special relativity, the Dirac equation and Stephen Hawking’s work on black holes.

decommissioning Dounreay – Bang Goes the Theory

This week’s episode of Band Goes the Theory was about the Fukushima disaster in Japan.  Part of the programme was filmed at Dounreay, where Dallas investigated the methods being used to decontaminate the site.  You can watch the part about Dounreay by playing this clip.

The whole programme is available for download using the link below (large download).

AH – help using Excel

This tutorial will help you with adding a line of best fit to your LO3 graph.  If you use the linest function, you can extract useful information on gradient and intercept of the line.  There are also screenshots to show how error bars can be added to individual points.

Excel Tutorial: Using LINEST function, Plotting a graph, Adding Error Bars

I have added a download link to a short pdf on the use of linest.

 

AH LO3

You completed the practical aspect of your LO3 task today.

For next week, please process your data so you can show me

  • complete table of results
  • a graph of centripetal force vs the square of angular velocity
  • sample calculations for your uncertainties.

This will probably be easier to complete if you use a spreadsheet program such as Excel or OpenOffice.  You will need diagrams for the procedure section of your LO3 report.  Scanned images of the apparatus are available here.