For a coin on a book, the given graph shows the magnitudes of normal force, limiting friction, kinetic friction and static friction versus inclination angle θ. The coin starts slipping at θ = θ꜀. The coefficients are μₛ = 0.6 and μₖ = 0.4. Seventeen points on the graph are numbered.
Physics · Newtons law of motion and Friction · types of friction and problem based on it
For a coin on a book, the given graph shows the magnitudes of normal force, limiting friction, kinetic friction and static friction versus inclination angle θ. The coin starts slipping at θ = θ꜀. The coefficients are μₛ = 0.6 and μₖ = 0.4. Seventeen points on the graph are numbered.

Sub-question 1
The magnitude of the normal force is represented by which numbered curve/point?
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Sub-question 2
θ꜀ is represented by which numbered point?
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