Question

Figure 158-M5-3.JPG In one experiment you measured the acceleration of a glider that is floating on an air track while being pulled by a string routed over a pulley. By measuring the acceleration when the glider is moving towards the pulley and away from the pulley, you were able to determine the frictional force acting on the glider. Assume the total mass of the system (the glider, hangar and any additional masses placed on both) is 328.5 grams. If the acceleration when the glider is moving away from the pulley is 60.5 cm/s2 and the acceleration when the glider is moving toward the pulley is 57.8 cm/s2, what is the frictional force acting on the glider? O a. 200 dyne O b. 450 Newton O c. 440 dyne O d. 200 Newton

Answer 1

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Sol" when glider is moving towards the pulley. M₂ g - T2 = Mad2 .-0 Tz - f = M, 92 - ② aq" + " ta Mag - (M + M2 ) 22 ~ ③ when glider is moving away from pully: M2g - Ti = M₂ a, ③ Titf = Mia -- en ③ req" M2g + f = (M2 + M1 ) a, t = 1 M2 tm , ) a, a M2 g -③ by eq" ☺ 4 © ta (Mat M.) a, fa (M + M₂) a2 f = (M2+M, ) (9, 092) f = 328.5 (57.87605) 2 I H = Rp 443.475 dyne 1 14 ~ 440 dyner

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