Question 11 a. You have been hired to measure the coeffi- cients of friction for

Question

Question 11 a. You have been hired to measure the coeffi- cients of friction for the newly discovered sub- stance jelloium. Today you will measure the co- Motion efficient of kinetic friction for jelloium sliding on dertecte steel. To do so, you pull a 200 g chunk of jel- loium across a horizontal steel table with a constant string tension of 1.00 N. A motion detector records the motion and displays the graph shown. What is the value of uk for jelloium on steel? b. What string tension would be needed for the object to move at a constant speed of 3.5 m/s? 80am H Sting20cm 10 11's Resilts 2s Exporiment

Explanation / Answer

Fx = ma = F - ff = F - µk*N = F - µk*mg

Fy = 0 = N – mg

µk = (F - ma)/mg        & x = ½*a*t2 ======> 0.80 m = ½*a*4

a = 0.40 m/s2

µk = (1.00 - 0.20*0.40)/(0.20 *10) = 0.46

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