A simple question about the concept please come and help

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The discussion revolves around calculating the maximum acceleration a runner can achieve given that friction between her shoes and the pavement is 90% of her weight. Participants clarify that according to Newton's 2nd law (F=ma), the net force acting on the runner is the frictional force. The frictional force is equated to the product of mass and acceleration, allowing for the calculation of maximum acceleration. The conversation emphasizes understanding the relationship between net force and friction in this context. Ultimately, the participants reach a clearer understanding of the concept.
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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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