different values of the mass of the block m and compare the results of the measurements with theoretical predictions. Procedure Physics Simulations: Inclined Plane htt 5: o h sics.com f2.htm| Static and Kinetic Friction on an Inclined Plane 1. Set the angle ofthe incline 9 = 25, coefficient of kinetic friction #k = 0.15, coefficient of static friction #5 = 0.4 (Note: static friction is irrelevant here but the value of [15 should be set up for the simulation to run). 2. In Run #1, set the mass of the block in = 5 kg. In Run #2, change the mass to 10 kg. 3. Launch the block up the inclined plane with initial velocity v0 = 10 m/s and record its acceleration when it moves first up and then down the inclined plane. 4. Calculate the values of "up" and "down" accelerations. 5. Summarize your results in the tables below. Sliding up the inclined plane alarm/S2 aupnn/sz Run m, kg measured calculated #1 #2 10 6:08 AA ophysics.com oPhysics: Interactive Physics Simulations Home Kinematics Forces Conservation Waves Light E& M Rotation Fluids M Modern Drawing Tools Fun Stuff Static and Kinetic Friction on an Inclined Plane Reset Vector length Start Pause Show free-body diagram short long Initial velocity (m/s) -5 k Step Step >| Show components Zoom in Zoom out Show 8 9 (m/s2) 9.8 t=0s v = -5 m/s a = 5.102 m/$2 mass (kg) 3 Ax = 0 m Vo HS (0 - 1) 0.4 mg HK (0 - US) 0.19 mg Angle () 20 mg Description This is a simulation of the motion of an object on an inclined plane. The incline angle can be varied from 0 to 90 degrees. The forces acting on the object: gravity, normal force of the incline, and friction are represented as vectors. Components of the force of gravity parallel and perpendicular to the incline can also be shown. The object can be released from rest (initial velocity =0) to see if it will move on its own. Alternatively, the object can be given an initial velocity down or up the incline. The simulation will realistically show the resulting motion of the object. In the case that the object eventually comes to rest, the total time and displacement are shown. When the object is at rest (or comes to rest) static friction acts, when it is in motion there is kinetic friction acting on it opposite to the direction of its motion.8 I2-xythos.content.blackboardcdn.com C Experiment 5: Acceleration ofa Cart Introduction The purpose ofthis lab is to explore acceleration pfa block sliding up and down the incline plane with friction. Free-body diagrams forthe block sliding down and up the incline are shown in Figures A and B, respectively. Figure A Figure B In the presence of friction, acceleration of the block sliding down (madam) and up (any) the incline is different because the force offriction changes direction when direction of the block motion changes as shown in Figs. A and B. The magnitude of the force of kinetic friction, F}; , is determined as kar = :51ka where M is the coefficient of kinetic friction. and the normal force F\" is determined as FN = mg cos 9 Using the above formulas (see the lecture notes for details) one can find that for a block sliding down the inclined plane \"down : g(sin 3 m. cos 3) whereas for a block sliding up the inclined plane \"up = g(sin i9 + pk cos 0) In these formulas, H is the incline angle and g = 9.8 m/s2 is acceleration due to gravity. In this experiment, we measure the acceleration of a block sliding up and down the inclined plane at two different values ofthe mass ofthe block m and compare the results of the measurements with theoretical predictions. 5156 B east1prod-f|eet02xythos.content.blackboardcdn.com Sliding down the inclined plane Run m, kg aduwmm/Sz \"down; 771/52 measured calculated #1 5 #2 10 Questions: 1. Why is acceleration independent on the mass of the block? (lookfor unswerin the lecture notes) 2. What value of acceleration, am, or \"down , is larger? Why? 3. Why the value of velocity is negative when the block moves up the incline and positive when the block moves down the incline? 4. Why the value of acceleration is always positive regardless of the direction ofthe block motion