I need help on the second part of Q 2:
When vehicles corner on a level road, the resultant force is provided by friction.
For a given vehicle and road surface, the friction cannot exceed a certain maximum value.
Use these facts, together with the expression for the resultant force, to explain why roads designed for high-speed travel have no sharp bends. 
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Phy4 jan 2005 watch
- Thread Starter
- 15-06-2005 15:03
- 15-06-2005 15:37
Using F =mv²/r you know that the centripetal force required for it to follow a circular path is mugh larger as as radius decreases (sharp bends). As the frictional force reaches a maximum value it is not enough for the vehicle to continue in a circular path.
That sounds alright.