A box is placed on an inclined surface. This box has mass 10kg, and the static friction coefficient is and the kinetic friction coefficient . The inclined angle . How many forces applied on the box? What are their directions? What is the driving force? How big is it?  How big is the normal force?  What is the maximum static friction?  Can you estimate the motion of this box? What is the acceleration? What is the static friction now? At least how big is a force F (parallel to X-axis) to push the box move down?

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A box is placed on an inclined surface. This box has mass 10kg, and the static friction coefficient is and the kinetic friction coefficient . The inclined angle .

  1. How many forces applied on the box? What are their directions?
  2. What is the driving force? How big is it?
  3.  How big is the normal force?
  4.  What is the maximum static friction?
  5.  Can you estimate the motion of this box? What is the acceleration?
  6. What is the static friction now?
  7. At least how big is a force F (parallel to X-axis) to push the box move down? 
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