Calculate Friction based on v, t, m & F

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To calculate the force of friction acting on a dragster that reaches 350 km/h in 6.2 seconds, the net force equation Fnet = ma is applied. The acceleration was determined to be 15.68 m/s², leading to a calculated friction force of 10,944 N. This result is close to the textbook answer of 10,900 N, suggesting rounding differences. The discussion highlights the importance of understanding the relationship between driving force, mass, and acceleration in friction calculations. Overall, the participant demonstrates progress in grasping the concepts involved.
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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^2

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.
 
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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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Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
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