A person pushes on a stationary 125 box with 65at 30 below the horizontal, as sh

Question

A person pushes on a stationary 125 box with 65at 30 below the horizontal, as shown in the figure. The coefficient of static friction between the box and the horizontal floor is 0.90.(Figure 1)
Part A
What is the normal force on the box?
=



Part B
What is the friction force on the box?
Express your answer using two significant figures.
=



Part C
The person now replaces his push with a 65 pull at 30 above the horizontal. Find the normal force on the box in this case.
Express your answer using two significant figures.
=

Explanation / Answer

PART A N = mg + Fsin(theta) = 1282.5 N PART B Friction force = 0.9 * N = 1154.25 N PART C N = mg - Fsin(theta) = 1217.5 N

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