How Do You Calculate Frictional Force in a Braking Scenario?

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SUMMARY

The discussion centers on calculating the frictional force in a braking scenario involving a car with a mass of 800 kg, which accelerates to 18 m/s in 12 seconds and then comes to a stop over a distance of 50 m. The resultant force acting on the car during acceleration is determined to be 1200 N, calculated using the formula F=ma. The distance traveled during acceleration is calculated as 108 m using the equation s= ut + 1/2at². To find the average frictional force during braking, participants suggest using kinematic equations to determine deceleration and final velocity.

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  • Understanding of Newton's Second Law (F=ma)
  • Familiarity with kinematic equations
  • Basic knowledge of dynamics and motion
  • Ability to calculate average force from mass and acceleration
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  • Study the concept of frictional force and its calculation in dynamics
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  • Investigate real-world applications of friction in braking systems
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Students studying physics, particularly those focusing on dynamics and motion, as well as educators looking for practical examples of force calculations in braking scenarios.

Lami
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Homework template is missing because this was originally posted in a non-homework forum
I'm very new to physics and am doing a crash higher course. I am currently tackling dynamics, and here is one of the questions I was given.
8 ) A car of mass 800kg is accelerated from rest to 18m/s in 12 seconds.
a) What is the size of the resultant force acting on the car
b) How far does it travel in these 12 seconds?
c) At the end of 12 seconds period the brakes are operated and the car comes to rest in a distance of 50m. What is the size of the average frictional force acting on the car?

I got for a) F=ma =800 x 1.5 = 1200N For b) s= ut+ 1/2at^2 = 0.5 x 1.5 x 144 = 108m. I'm confused with how to go about tackling c and was wondering how to tackle it? Apologies in advance for if it's blarringly obvious.
 
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you have distance, initial velocity, final velocity and solving for acceleration. Solve the kinematic equation that doesn't have time.
 
Lami said:
I'm confused with how to go about tackling c and was wondering how to tackle it?
What is the final velocity in part c? What is the velocity at the instant of application of brakes? Can you calculate the deceleration from this?
 

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