Find the size of the force due to wind and rolling friction

AI Thread Summary
The discussion focuses on calculating the force due to wind and rolling friction for a van with a mass of 2300 kg traveling at 42.17 mph. The acceleration was calculated as 0.3465 m/s², leading to a force of 797 N using the formula F = ma. Participants noted the nonlinear nature of the provided graph and questioned the precision of the speed measurement. There was also clarification on whether the weight in pounds was necessary for the calculations, with the consensus being that it was not essential. The conversation emphasizes the importance of using the correct data and methods for accurate force calculations.
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[SOLVED] Force Problem

The total mass is 2300kg (weight = 5072lbs). Find the size of the force due to wind and rolling friction when the van speed is 42.17mph (1mph= 0.447m/s).

This is the graph: http://capa-new.colorado.edu/msuphysicslib/Graphics/Gtype12/prob09a_1004minivan.gif"

F = ma

a = (speed 2 - speed 1)/(Time 2 - Time 1)

Converted mph to m/s: a = (26.82 - 18.85)/(23) = 0.3465 m/s^2

Now F = (2300*0.3465) = 797 N

What did I do wrong?
 
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You didn't do much wrong. Your graph looks a bit nonlinear, but I don't see how they would expect you to read much more than a rough estimate off of it. Is that really the statement of the problem? 42.17mph!? Four decimal places?
 
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Take the slope over the entire range of the graph.
 
That's what I'm assuming... they gave me the weight in lbs. do I need to incorporate that into my equations in any way or is that just unnecessary/useless info.
 
ohhi thanks a lot !
 
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