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.
am08
Messages
43
Reaction score
0
[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?
 
Last edited by a moderator:
Physics news on Phys.org
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?
 
Last edited:
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 !
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

Rolling without slipping problem
Replies
42
Views
3K
What Is the Effect of Friction on the Height of a Sphere Rolling Down a Ramp?
Replies
2
Views
2K
How Do I Determine Force of Static Friction on a Rolling Car
Replies
15
Views
2K
Rolling of a Disc: Find Acceleration with Friction
Replies
8
Views
2K
I Rolling Without Slipping
2
Replies
59
Views
3K
Cylinder rolling due to magnetic force
Replies
4
Views
1K
Find the force P such that the disk rolls without slip
Replies
1
Views
2K
Force due to wind and rolling friction
Replies
6
Views
9K
Understanding Rolling Motion: Friction Forces and Velocity Changes
Replies
5
Views
1K
Solving For Rolling Friction in Bike Tires
Replies
3
Views
12K

Hot Threads

Recent Insights

Back
Top