Solve Car Acceleration: Force of Friction Homework

AI Thread Summary
To determine the coefficient of friction for a 1250 kg car that stops from 60.0 km/h over 35 m, first calculate the car's acceleration using kinematic equations. The average velocity during braking can be found, which helps in calculating the time taken to stop. Once the time is known, the acceleration can be derived. The frictional force can then be calculated using the formula Fr = μN, where N is the normal force. Understanding these steps is crucial for solving the problem effectively.
anikam
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Homework Statement



A 1250 kg car traveling at 60.0 km/h comes to a sudden stop in 35 m. What is the coefficient of friction acting on the brakes?

HOW WOULD YOU FIND OUT THE ACCELERATION OF THE CAR?

Homework Equations


Fr= μN
Fn= ma


The Attempt at a Solution


I'm stumped on how to figure out the acceleration of the car as they only give you the mass, distance, and final velocity. Can anybdoy help me? Thanksss!
 
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Do you have a list of formulas for constant accelerated motion?
There is one that does the job!
 
no i wasnt given a list, sorry.
 
anikam said:

Homework Statement



A 1250 kg car traveling at 60.0 km/h comes to a sudden stop in 35 m. What is the coefficient of friction acting on the brakes?

HOW WOULD YOU FIND OUT THE ACCELERATION OF THE CAR?

Homework Equations


Fr= μN
Fn= ma

The Attempt at a Solution


I'm stumped on how to figure out the acceleration of the car as they only give you the mass, distance, and final velocity. Can anybody help me? Thanksss!
As Delphi51 said, you could use one of the kinematic equations.

However, you can work it out as follows.

Assuming uniform acceleration,you can easily determine the average velocity. (Do you know what the average velocity is during the time the car is braking?) Then from that you can find the time to go 35 meters. Then find the acceleration.
 
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