# Nonconservative forces

I am really having a hard time with this there is something I am missing can someone help
a 2100 kg car starts from rest at the top of a 5.0 m long driveway that is sloped at 20 Deg with the horizontal . if an average friction force of 4000 N impedes the motion find the speed of the car at the bottom of the driveway. The answer is 3.8m/s

nbo10
Use newton's law F_total = m*a.

JMD

Astrophysics
That's not entirely correct nbo10, first u need to calculate the Gravitational force on the truck, then you calculate the Fx, which will help you further.

p.s. don't forget the 20 degrees

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nbo10
Originally posted by Astrophysics
That's not entirely correct nbo10, first u need to calculate the Gravitational force on the truck, then you calculate the Fx, which will help you further.

p.s. don't forget the 20 degrees

No, I'm entirely correct. F_total includes gravitational foce and friction.

JMD

Astrophysics
I think, I think more like a physics teacher, since I don't think F_total = m*a is very precise. I think emaqueen already knew about this equation.