How Does Friction Affect Energy Between Points B and C?

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SUMMARY

The discussion focuses on the impact of friction on energy as a man runs from point A to point C, with specific speeds of 40 m/s at point B and 23 m/s at point C over a distance of 30 meters. The man has a mass of 60 kg, and the work done by friction is calculated using the formula Work = - (friction force) * m * g * x. The kinetic energy at points B and C is analyzed, revealing that the decrease in total energy is attributed to frictional forces. The potential energy change from B to C is also examined, emphasizing the role of friction in energy loss.

PREREQUISITES
  • Understanding of Newton's laws of motion
  • Familiarity with the concepts of kinetic and potential energy
  • Knowledge of work-energy principles
  • Basic grasp of frictional forces and their calculations
NEXT STEPS
  • Calculate the force of friction using the formula Work = - (friction force) * m * g * x
  • Explore the relationship between kinetic energy and speed changes in physics
  • Investigate the effects of different friction coefficients on energy loss
  • Learn about energy conservation principles in mechanical systems
USEFUL FOR

This discussion is beneficial for physics students, educators, and anyone interested in understanding the dynamics of motion, energy transformations, and the effects of friction in mechanical systems.

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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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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.
 

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