Maximizing Sand Pulled: Angle & Weight

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SUMMARY

The discussion focuses on optimizing the angle and weight of sand being pulled by a cable with a maximum tension of 1220N and a static friction coefficient of 0.24. To maximize the amount of sand pulled, the angle between the cable and the horizontal must be calculated using static friction principles and free body diagrams. The solution involves applying Newton's laws in both the x and y directions to determine the optimal angle and the corresponding weight of the sand and box.

PREREQUISITES
  • Understanding of static friction and its coefficient
  • Knowledge of Newton's laws of motion
  • Ability to create and interpret free body diagrams
  • Familiarity with trigonometric functions related to angles
NEXT STEPS
  • Calculate the optimal angle for maximum sand pulling using static friction equations
  • Determine the weight of the box and sand at the optimal angle
  • Explore the effects of varying the coefficient of static friction on the system
  • Investigate dynamic friction and its implications for pulling forces
USEFUL FOR

Physics students, engineers, and anyone involved in mechanics or material handling who seeks to understand the dynamics of pulling forces and frictional effects.

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Homework Statement



An initially stationary box of sand is to be pulled across a floor by means of a cable in which the tension should not exceed 1220N. The coefficient of static friction between the box and the floor is 0.24. (a)What should be the angle between the cable and the horizontal in order to pull the greatest possible amount of sand, and (b) what is the weight of the sand and box in that situation?


Homework Equations





The Attempt at a Solution



dm/dθ= (-F/a)cosθ...
 
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Before the object can accelerate, it first has to overcome static friction in the equilibrium condition(a =0). m is maximized when dm/dθ = ?. Try a free body diagram to identify forces acting, and use Newton 1 in the y direction , and Newton 1 in the x direction at the limiting value of the static friction force.
 

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