A simple question about the concept please come and help

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Homework Help Overview

The discussion revolves around a physics problem related to acceleration and friction, specifically examining the maximum acceleration a runner can achieve given a frictional force that is a percentage of her weight. The context is rooted in Newton's laws of motion.

Discussion Character

  • Conceptual clarification, Mathematical reasoning, Assumption checking

Approaches and Questions Raised

  • Participants explore the relationship between net force, friction, and acceleration, with some questioning how to identify the forces involved. There are hints referencing Newton's 2nd law, and discussions about the net force being equal to friction.

Discussion Status

The conversation is active, with participants attempting to clarify their understanding of the forces at play. Some guidance has been offered regarding the application of Newton's 2nd law, but there remains some uncertainty about the specific forces involved.

Contextual Notes

Participants express confusion regarding the definitions and roles of force and friction in the context of the problem, indicating a need for further exploration of these concepts.

devin125
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What is the greatest acceleration a runner can muster if the friction between her shoes and the pavement is 90% of her weight?
 
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What do you think? Hint: Newton's 2nd law.
 
Doc Al said:
What do you think? Hint: Newton's 2nd law.

I dun really get it, for all I understand is only F=ma...
 
devin125 said:
I dun really get it, for all I understand is only F=ma...
That's Newton's 2nd law. What's the force?
 
Doc Al said:
That's Newton's 2nd law. What's the force?

the force is net force, so is it just F-the friction= ma?
 
devin125 said:
the force is net force, so is it just F-the friction= ma?
Yes. The net force is the friction.
 
Doc Al said:
Yes. The net force is the friction.

but what is the F in order to minus the friction?
 
devin125 said:
but what is the F in order to minus the friction?
No, the net force is the friction. Just set it equal to ma.
 
Doc Al said:
No, the net force is the friction. Just set it equal to ma.

O...I understand now. Thx for helping...
 

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