Find frictional force from mass and acceleration

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SUMMARY

The discussion focuses on calculating the frictional force acting on a car with a mass of 925 kg and an acceleration of -12.2 m/s². The net force (Fnet) is determined to be -11285 N using the formula Fnet = MA. The gravitational force (Fg) is calculated as 9065 N. The user seeks clarification on whether additional information, such as the applied force (Fa) or the coefficient of friction, is necessary to solve for the frictional force (Ff).

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  • Understanding of Newton's Second Law of Motion
  • Knowledge of gravitational force calculations
  • Familiarity with frictional force equations
  • Basic algebra for solving equations
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liz777
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Homework Statement



Acceleration of a car is -12.2 m/s/s. The car has a mass of 925 kg. Find the frictional force.


The Attempt at a Solution



So A=-12.2, M=925 kg

Fnet=MA
=925(-12.2)
= -11285 N

Fg=mg
=925(9.8)
=9065 N

Since there is no vertical direction, Fg=Fnorm.

Now I have the equation Ff(frictional force= coefficient(normal force)

I'm really stuck here. I need to know the Fa or the coefficient to solve?
 
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If that's the whole questions then Fnet=Ff=ma

so you got it..
 

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