Solve Friction Problem: Find Car Mass and Normal Force

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Homework Help Overview

The discussion revolves around a physics problem involving a car moving down a slope and the forces acting on it when brakes are applied. The subject area includes dynamics, friction, and forces on inclined planes.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • The original poster attempts to identify the necessary equations and steps to find the car's mass and the normal force. Some participants suggest drawing a free body diagram and resolving forces into components, while others inquire about the poster's previous experience with similar problems.

Discussion Status

The discussion is progressing with participants providing guidance on how to approach the problem. The original poster has expressed some understanding after receiving input, indicating a shift towards clarity in the problem-solving process.

Contextual Notes

The original poster mentions uncertainty about the equations needed and the steps to take, highlighting a lack of prior experience with friction-related problems.

BluE
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Hi, I got stuck on this and need help...

The most massive car ever build was the official car of the General Secretary of the COmmunitst party in the former Soviet Union. Suppose this car is moving down a 10.0º slope when the driver suddenly applies the brakes. The net force acting on the car as it stops is -2.00 x 10^4 N. If the coefficient of kinetic friction between the car's tires and the pavement is 0.797, what is the car's mass? What is the magnitude of the normal force that the pavement exerts on the car?

So, the given info are:
theta = 10 degrees
force, applied = -2.00 x 10^4 N
and mew k = 0.797
gravity = 9.81 m/s^2

Is that right? Now this is where I'm stuck.. I'm not sure what I need to find first and the equations to use to find it...

Please help... thank you!
 
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Draw an free body diagram remembering the fact that the normal force will be applied normal to the surface. Have you solved any sliding questions before using friction?
 
Yes, I've drawn a free body diagram, but I'm not sure how to solve it now.

I have not solved questions using friction before.

Do I need to find the x and y components and go from there?
 
Yes, you need to resolve components so that they are all either parallel or perpendicular to the inclined plane.
 
Alright, I've gotten it. Thank you, everyone.
 

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