Calculate Friction based on v, t, m & F

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SUMMARY

The discussion focuses on calculating the force of friction acting on a dragster that accelerates from rest to 350 km/h in 6.2 seconds, with a mass of 800 kg and a driving force of 1600 N. The user successfully calculated the acceleration as 15.68 m/s² and derived the frictional force (Ff) as 10,944 N, which is close to the textbook answer of 10,900 N. The discrepancy is attributed to rounding differences in the textbook. The key formula used is Fnet = ma, where net force is the difference between driving force and frictional force.

PREREQUISITES
  • Understanding of Newton's Second Law (Fnet = ma)
  • Basic knowledge of kinematics, specifically acceleration calculations
  • Familiarity with unit conversions (e.g., km/h to m/s)
  • Concept of forces acting on an object, including friction
NEXT STEPS
  • Study detailed examples of calculating net force in physics problems
  • Learn about the role of friction in motion and its calculation methods
  • Explore kinematic equations for different types of motion
  • Investigate the effects of rounding in scientific calculations and its implications
USEFUL FOR

This discussion is beneficial for physics students, educators, and anyone interested in understanding the principles of motion and force calculations, particularly in automotive contexts.

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[SOLVED] Calculate Friction based on v, t, m & F

Homework Statement


A dragster reaches 350km/h from rest in 6.2s. If the car is 800kg and generates a driving force of 1600N, find the force of friction acting on the car.

Homework Equations


Fnet = ma

The Attempt at a Solution


I tried converting, and then got lost from there. 350km/h is now 97.2m/s. What do I do now? How do I get friction... I know it's got something to do with gravity.

I just found out the acceleration which is 15.68m/s[tex]^2[/tex]

Edit: I got 10944N for Ff, and the book is 10900N. I can't believe I'm even close, lol, but what did I do wrong? Or is it just the book rounding it, because I've found other numbers rounded.
 
Last edited:
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The book rounded. You did it right if you got that answer.
 
Alrightt! Thanks... at least I'm catching on to some things, and won't fail that bad :)
 

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