Homework 4 Begin Date: 9/27/2017 2:30:00 PM Due Date: 10/9/2017 11:59:00 PM End

Question

Homework 4 Begin Date: 9/27/2017 2:30:00 PM Due Date: 10/9/2017 11:59:00 PM End Date: 10/10/2017 4:00:00 AM (8%) Problem 11: A block is resting on a wooden plank. There is a hinge on one end of the plank which allows the other end to be lifted to create an angle, , with respect to the horizontal as shown in the figure. The coefficient of static friction between the block and the plank is A Otheexpertta.com 33% Part (a) Please select the corect Free Body Diagram, where F, is the force due to gravity, FN's the normal force, and F, is the static friction force. 33% Part (b) The angle is slowly increased, write an expression for the angle at which the block begins to move in terms of Grade Summary Deductions Potential '00% acos() acotan()asin) Submissions Attempts remaining: 12 (5% per attempt) detailed view | 4 5 6 atan(14) sin(A) | | cos() cos44) sin(0) 0 Submit Hint I give up! Hint,5% deduction per hint. Hints remaining Feedback: 2% deduction per feedback. 33% Part (c) If a student measures that the block begins to move at an angle of 0 = 27 S , what is the numerical value of the co efficient of static friction,

Explanation / Answer

b) Fs = mus FN

Fg sin theta = mus FN

Fg sin theta = mus (Fg * cos theta)

tan theta = mus

theta = tan-1 [mus]

c) theta = 27.5 deg

tan 27.5 = mus

mus = 0.521

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