How to find decceleration of the car

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SUMMARY

The discussion centers on calculating the deceleration of a car when the brakes are applied, given a coefficient of friction of 0.7 between the road and tires. The user inquires whether friction increases or decreases deceleration. It is established that friction opposes the motion of the car, thereby increasing the overall deceleration when brakes are applied. The final deceleration can be determined by combining the effects of the braking force and the frictional force.

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vastandfurious
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Hello,
I have a question to figure out that asks for the final decceleration of the car, if the coefficient between the road and tire is 0.7 and the guy in the car pushes the breaks causing the tire to deccelearate at 2 m/s...hmmm...It is a simple question, but I cannot figure out if the friction increases the deceleration or decreases it...Any help is appreciated...

EDIT: BTW just noticed, that I can't post homework questions here...my bad
 
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Welcome to PF,

vastandfurious said:
It is a simple question, but I cannot figure out if the friction increases the deceleration or decreases it

all you need to do is ask yourself, does the frictional force oppose or promote the motion of the car? What does friction do?

-Hoot:smile:
 

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