How Does Friction Affect Energy Between Points B and C?

In summary, the conversation discusses a man who runs from point A at a speed of 40 m/s in B and 23 m/s in C, with a distance of 30 meters between B and C. The conversation also asks about the work done by friction on the man, his maximum height reached at point C, and the kinetic and potential energy changes between points B and C. The quotient of the force of friction is needed to calculate the work done, but the conversation does not ask for it. The conversation also mentions using the angle to find the quotient, but it is not clear how. The final question asks about the kinetic energy in points B and C and the potential energy difference caused by friction.
  • #1
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A man who was first standing runs from the point A.His speed is 40 m/s in B and 23 m/s in C,where the distance BC=30 meters..a) What work does the force of friction over the man ( m=60kg)? b) Find the max height reached by the man in the C level.. image here http://i.imgur.com/HVd7UH2.jpg


I don't know how to find the quotient of the force of friction in the image? Because Work = -(quotient)* m*g*x.. I can find x because mv0^2/2+ +mv^2/2=mgh and I can find h,how about the quotient? does the angle help me?

how about point b? please help me..
 
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  • #2
I don't know how to find the quotient of the force of friction in the image?
That is not asked.

What is the kinetic energy of the man in B and C? How does his potential energy change from B to C? You will see that the sum of both decreased - this difference is caused by friction.
 

FAQ: How Does Friction Affect Energy Between Points B and C?

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