Remote controlled carsMechanics
Name: Nick
Thank you very much for your reply, however I would be most grateful if you could help me with a small problem I am having with my A2 physics coursework.
As you may know, there is no real boundary or task given, however my project must be original and produce some sort of physics based data. I was originally hoping to do an experiment with a remote control car, where I would drive it on different surfaces (e.g. asphalt, ice, sand etc.) and calculate the friction between the tyres and the surface.
How would I be able to do this without including the friction of the engine, wheels etc. and keep the variables constant? Is there any other experiment that I could do to make a comparison with that set of data (for example calculate the coefficient of friction between the surface and the tyres and see how this compares to the time it takes to travel a certain distance)?
Please feel free to point out anything in the basis of this experiment and how I could rectify. Thank you so much again for your time.
Nick
Country: UK
Dear Nick,
It seems that you are basically looking to investigate the friction between various road type surfaces.
If you want to look at the problem without friction of the engine why not try the following:
(a) run the car onto the surface in an unpowered state and measure the distance it takes to stop (for a given initial velocity). Remember that the kinetic energy before braking is equal to the work done against the frictional force (apparently the coefficient of friction between cars tyres and asphalt is 0.72, car tyres and ice 0.15, car tyres and cement 0.9, car tyres and wet asphalt 0.45-0.70) and that between car tyres and grass 0.35).
(b) run the car down a ramp onto the surface (again unpowered) and measure as before. Use a light gate to find the speed of the car just before the braking process begins
(c) take a tyre off the car and roll it across the surface (keep it upright)
(d) take a tyre off the car and slide it across the surface
(e) try loading the car with different masses to see what effects this has.
There is a lot about the Physics of Car accidents on the net. Frictional and braking problems, they are very interested in this in the USA and Canada. Here are three web site that you might like to look at, I think it would be very interesting back up for your investigations and would look good in the A2 account. (Both references and excerpts).
- 95k - Cached - Similar pages
hypertextbook.com/physics/mechanics/momentum-two-three/ accident-reconstruction-2.pdf - Similar pages