New to calculating automotive formula. Help

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    Automotive Formula
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Discussion Overview

The discussion revolves around calculating the acceleration of a vehicle based on its mass, tractive effort, and tractive resistance. Participants are exploring the application of Newton's second law in the context of automotive physics, specifically on a level road.

Discussion Character

  • Homework-related, Technical explanation

Main Points Raised

  • One participant states the formula for acceleration as a = F_net/m, emphasizing the need to consider the net force, which includes both tractive effort and resistance.
  • Another participant highlights the importance of unit consistency, particularly converting mass from tonnes to kilograms and ensuring force units are aligned.
  • A third participant expresses difficulty in providing guidance without revealing the solution directly, suggesting a focus on understanding the units involved in the calculations.

Areas of Agreement / Disagreement

Participants generally agree on the application of Newton's second law but do not reach a consensus on the best way to guide the original poster without giving away the answer.

Contextual Notes

There are limitations regarding the specific values of mass and tractive effort, as they are represented as variables (X and Y), which may affect the clarity of the discussion. Additionally, the exact nature of the tractive resistance is not fully defined beyond a single example value.

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Homework Statement


A vehicle has a mass of X tonne. Tractive effort is Y kN. Travelling on a level road. Formula to calculate acceleration is a=f/m and tractive resistance is 250N (for example). How the devil do I work out the acceleration of the vehicle? I am totally stumped.


Homework Equations





The Attempt at a Solution

 
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It's F_net = ma, not F=ma. If you are given the mass of the vehicle, X, and the tractive effort, Y, and the tractive resistance, R, then a = F_net/X, where F_net is the algebraic sum of Y and R (which act in opposite directions). Don't forget to convert tonnes to kilograms, and be consistent with force units.
 
I'm struggling to find a way to walk you through this without giving the answer away.

You just put what you know in Newtons second law equation. look at the units of the info you are given, then look at the units used in the equation.
 
Thanks for the offers of help folks.
 

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