# Physics Graph Q - HelpWatch

#1
Hey guys, could anyone explain how I would draw the line for this question? And explain why? I think I understand but I just want to double check.

Also - would a car travel faster when the roads are icy?

I understand that the breaking distance would be further.

Thanks

Arron
0
7 years ago
#2
(Original post by JediArron)
Hey guys, could anyone explain how I would draw the line for this question? And explain why? I think I understand but I just want to double check.
The braking distance is determined by the coefficient of friction between the tires and the ground. Recall the formula . Here, the maximum deceleration is proportional to the coefficient of friction between the tires and the ground (do you know why?).

Also - would a car travel faster when the roads are icy?

I understand that the breaking distance would be further.
There is no connection between the type of surface the car is travelling on, and the speed of the car (assuming no resistive forces). Of course the car would accelerate more slowly on an icy road than on a dry one, but the maximum speed is not limited by this fact.
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