IB Physics: Forces

Friction is always an interesting one to spend some time on. According to our simple model friction doesn"t depend upon the area of contact but if that is the case why do racing cars have slick tyres? Simple friction does not apply to sticky things.Students also think it strange that the force that pushes a car forward is also friction as it opposes the relative motion of tyre and road.I try not to mention movement in...

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