Remarks It's interesting that the final resultdepends only on the coefficient of static friction. Notice also howsimilar Equations (1) and (2) are to the equations developed inprevious problems. Recognizing such patterns is key to solvingproblems successfully.
Question A larger static friction constant would result in a:(Select all that apply.)
a) smaller component of gravitational force along the ramp atthe maximum angle.
b) larger maximum angle.
c)smaller maximum angle.
d)larger component of gravitational force along the ramp at themaximum angle.
e)larger component of normal force at the maximum angle.
PRACTICE IT Use the worked example above tohelp you solve this problem. Suppose a block with mass 2.80 kg isresting on a ramp. If the coefficient of static friction betweenthe block and the ramp is 0.420, what maximum angle can the rampmake with the horizontal before the block starts to slip down?
EXERCISE Use the values from PRACTICE IT tohelp you work this exercise. The ramp in the figure is roughed upand the experiment repeated.
(a) What is the new coefficient of static friction if themaximum angle turns out to be 38.0°?
(b) Find the maximum static friction force that acts on theblock.
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