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    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. [2]


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    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.
 
 
 
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