- #1
KiNGGeexD
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I am a little stumped with this question:( I have attached my solution so far which has just been to deduce the acceleration on the flat surface
Calculating Acceleration on a Flat Surface
- Thread starter KiNGGeexD
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- Acceleration Flat Surface
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Homework Help Overview
The discussion revolves around calculating acceleration on a flat surface, specifically in the context of a car coming to a stop. Participants are exploring the relationships between stopping time, acceleration, and the coefficient of kinetic friction.
Discussion Character
- Exploratory, Assumption checking, Problem interpretation
Approaches and Questions Raised
- Participants are attempting to deduce acceleration and stopping time, with some questioning how to find the coefficient of kinetic friction without knowing the car's mass. Others suggest using mass as a variable since it may cancel out in the equations.
Discussion Status
The discussion is ongoing, with some participants providing calculations and others seeking clarification on the methods used. There is a recognition of potential errors in initial calculations, and participants are encouraged to show their work for further assistance.
Contextual Notes
There are mentions of missing information, such as the mass of the car and the initial speed, which are critical for solving the problem. Participants are also navigating the implications of their assumptions regarding these variables.
I am a little stumped with this question:( I have attached my solution so far which has just been to deduce the acceleration on the flat surface
- #2
KiNGGeexD
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I posted images?
- #3
Andrew Mason
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KiNGGeexD said:
Can you determine the time that the car takes to stop and the acceleration?
From that can you determine the co-efficient of kinetic friction?
Once you that you should be able to solve it.
AM
- #4
KiNGGeexD
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Ahh ok!
I determined the time to stop as 10 seconds and acceleration to be 0.3m/s^2:)
So how do I get the kinetic friction coefficient without the mass of the car?
I determined the time to stop as 10 seconds and acceleration to be 0.3m/s^2:)
So how do I get the kinetic friction coefficient without the mass of the car?
- #5
Andrew Mason
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You should show us how you get that. What is the initial speed in m/s? Plot speed in m/s vs. time on a graph. What does the area under the graph represent? Work out the formula for that area and express in terms of change in speed and time.KiNGGeexD said:
Work it out using m for the car mass. You will see that mass cancels out.
AM
- #6
CWatters
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Write an equation, you might find the mass cancels.
- #7
KiNGGeexD
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I got
a= g(sinθ - μcosθ)But it occurs to me I don't have the acceleration
a= g(sinθ - μcosθ)But it occurs to me I don't have the acceleration
- #8
Andrew Mason
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Determine the time it takes to stop. Your calculation of 10 seconds is wrong. How do you determine acceleration from the stopping time and initial velocity?KiNGGeexD said:
Show your work and we can help you. We cannot guess what you are doing if you just tell us what you "got".
AM
- #9
KiNGGeexD
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Ah I know what I have done wrong, I converted the initial speed into m/s incorrectly :)
I think I got it now
I think I got it now