Physics can be truly weird and often counter intuitive. Everyone will be familiar with the reference to Star Trek in the title of this post and be aware that Klingons are very nasty extra terrestrials.
It turns out that Physics is stranger than fiction and Newtonian mechanics which describe the world around us (speed =distance/time for example) become hopelessly inadequate as you approach the speed of light. Einsteins Theory of General Relativity predicts time dilation or stretching. If you take a summer holiday on a beach near a black hole, time is dilated and the vacation lasts longer. As a consequence you return younger than friends who stayed at home using botox to slow ageing. G P satellites take time dilation into account when they compute accurate positions. Strange but true.
Ye canna change the laws of physics, laws of physics Jim
The laws of physics at Rainbows end…….. feel the force
…….and finally the worksheet for anyone who has lost the original. Eric and Bonita would appreciate feedback on the field trip. Any questions?
You are going to connect up the three circuits on page 227 of your workbook. You will then investigate the size of the current in different parts of parallel and series circuits using an ammeter.
Before you begin, a bit of revision watching a really boring video on the properties of series and parallel circuits
And now the challenge:
get your mobile phones out
take some pictures or video clips showing what happens during the investigation of the three circuits
make a movie using windows moviemaker or an animated movie using Animoto. (you need to log on and create an account but you can make 30 sedcond videos for free)
complete the worksheets on pages 227-229
There is a strong financial incentive for the producer/s of the best video
When a gas is given off during a chemical reaction the rate can be measured by weight loss on a pan balance.
Decide how you will compare the rates of reaction between 2.0 and 1.0 mole per litre hydrochloric acid with marble chips. Compare rates of reaction between 2.0 moles per litre hydrochloric and ethanoic acids with marble chips.
Gather data (use 50.0 ml samples of the acids for your investigations) and plot your results graphically.
A follow up investigation might look at the pH of sequentially diluted solutions of ethanoic and hydrochloric acids (2.0, 1.0, 0.1, 0.01, 0.001 moles per litre)
Research project write-up.
Do a brief experimental method and graph you results using a spreadsheet
Present your results on word document or powerpoint. Discuss your findings in terms of :
species in solution
observed rates of reaction
total mass of carbon dioxide released (starting with the same amount of acid)
the strengths of the acids and equilibrium concentrations
the pH of both acids at different concentrations
As a follow up to your research track the pH changes that occur during these reactions and discuss.
Top Gear and the Vampire, the ultimate acceleration on four wheels
…..and now the maths and science.
Vampire: technical information
estimated top speed; 370 mph
acceleration 0 to 272 mph in 6 seconds
engine; Rolls Royce Orpheus.
fuel economy: 7-10gallons per mile
Weight 2,200lbs(998Kg)
length 30 feet (9.14m)
Challenge: apply your science with some mathematics
Apply the science you have been studying to answer questions abouth the vanpire. Click on the comments button at the foot of this post and leave your answers.
The first 6 mostly correct answers will receive a mars bar (year 11 students or younger)
calculate the top speed in metres per second
calculate the acceleration in metres per second per second
The acceleration is produced by an unbalanced force. Calculate the thrust produced by the Rolls Royce Orpheus engine for this unbalanced force.
Why is the thrust produced by the engine actually much greater?
Physics can be truly weird and often counter intuitive. Everyone will be familiar with the reference to Star Trek in the title of this post and be aware that Klingons are very nasty extra terrestrials.
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