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### lab04proc

Course: PHYS 152, Fall 2011
School: IUPUI
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15200 PHYS Mechanics IUPUI Physics Department Lab 04: Friction OBJECTIVE In this experiment you will be verifying the relationship between the force of friction acting on a sliding object and its weight. You will also be measuring the coefficients of static and kinetic friction. This experiment is adapted from Vernier Physics with Computers experiments using Logger Pro. EQUIPMENT computer Vernier computer...

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15200 PHYS Mechanics IUPUI Physics Department Lab 04: Friction OBJECTIVE In this experiment you will be verifying the relationship between the force of friction acting on a sliding object and its weight. You will also be measuring the coefficients of static and kinetic friction. This experiment is adapted from Vernier Physics with Computers experiments using Logger Pro. EQUIPMENT computer Vernier computer interface Logger Pro Vernier Motion Detector Vernier Force Sensor string block of wood with hook electronic balance set of standard masses PROCEDURE PART I STARTING FRICTION 1. Measure the mass of the block and record it in the data table. 2. Connect the Dual-Range Force Sensor to Channel 1 of the interface. Set the range switch on the Force Sensor to 50 N. 3. Open the file 12a Static Kinetic Frict from the Physics with Computers folder. 4. Tie one end of a string to the hook on the Force Sensor and the other end to the hook on the wooden block. Place a total of 1 kg mass on top of the block, fastened so the masses cannot shift. Practice pulling the block and masses with the Force Sensor using this straight-line motion: Slowly and gently pull horizontally with a small force. Very gradually, taking one full second, increase the force until the block starts to slide, and then keep the block moving at a constant speed for another second. 5. Sketch a graph of force vs. time for the force you felt on your hand. Label the portion of the graph corresponding to the block at rest, the time when the block just started to move, and the time when the block was moving at constant speed. (Graph paper is printed on your worksheet.) 6. Hold the Force Sensor in position, ready to pull the block, but with no tension in the string. Click to set the Force Sensor to zero. 7. Click to begin collecting data. Pull the block as before, taking care to increase the force gradually. Repeat the process as needed until you have a graph that reflects the desired motion, including pulling the block at constant speed once it begins moving. Print or copy the graph for use in the Analysis portion of this activity. Lab04: Friction Page 1 of 3 PHYS 15200 Mechanics IUPUI Physics Department PART II PEAK STATIC AND KINETIC FRICTION In this section, you will measure the peak static friction force and the kinetic friction force as a function of the normal force on the block. In each run, you will pull the block as before, but by changing the masses on the block, you will vary the normal force on the block. Figure 1 8. Remove all masses from the block. 9. Click to begin collecting data and pull as before to gather force vs. time data. 10. Examine the data by clicking the Statistics button, . The maximum value of the force occurs when the block started to slide. Read this value of the maximum force of static friction from the floating box and record the number in your data table. 11. Drag the across region of the graph corresponding to the block moving at constant velocity. Click on the Statistics button again and read the average (or mean) force during the time interval. This force is the magnitude of the kinetic frictional force. 12. Repeat Steps 9-11 for two more measurements and average the results to determine the reliability of your measurements. Record the values in the data table. 13. Add masses totaling 250 g to the block. Repeat Steps 9 12, recording values in the data table. 14. Repeat for additional masses of 500, 750, and 1000 g. Record values in your data table. PART III KINETIC FRICTION AGAIN In this section, you will measure the coefficient of kinetic friction a second way and compare it to the measurement in Part II. Using the Motion Detector, you can measure the acceleration of the block as it slides to a stop. This acceleration can be determined from the velocity vs. time graph. While sliding, the only force acting on the block in the horizontal direction is that of friction. From the mass of the block and its acceleration, you can find the frictional force and finally, the coefficient of kinetic friction. Figure 2 Lab04: Friction Page 2 of 3 PHYS 15200 Mechanics IUPUI Physics Department 15. Connect the Motion Detector to DIG/SONIC 1 of the Vernier computer interface. Open the 12b Static Kinetic Frict in the Physics with Computers folder. 16. Place the Motion Detector on the lab table 2 3 m from a block of wood, as shown in Figure 2. Position the Motion Detector so that it will detect the motion of the block as it slides toward the detector. 17. Practice sliding the block toward the Motion Detector so that the block leaves your hand and slides to a stop. Minimize the rotation of the block. After it leaves your hand, the block should slide about 1 m before it stops and it must not come any closer to the Motion Detector than 0.4 m. 18. Click to start collecting data and give the block a push so that it slides toward the Motion Detector. The velocity graph should have a portion with a linearly decreasing section corresponding to the freely sliding motion of the block. Repeat if needed. 19. Select a region of the velocity vs. time graph that shows the decreasing speed of the block. Choose the linear section. The slope of this section of the velocity graph is the acceleration. Drag the mouse over this section and determine the slope by clicking the Linear Fit button, . Record this value of acceleration in your data table. 20. Repeat Steps 18-19 four more times. 21. Place masses totaling 500 g on the block. Fasten the masses so they will not move. Repeat Steps 18-19 five times for the block with masses. Record acceleration values in your data table. Each student is required to turn in a completed worksheet by the end of the lab session unless otherwise indicated by the lab instructor. Lab04: Friction Page 3 of 3
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IUPUI - PHYS - 152
PHYS 15200 MechanicsIUPUI Physics DepartmentLab 04: Friction WorksheetNameDatePartnersPART I STARTING FRICTIONMass of block =Lab04: FrictionkgPage 1 of 4PHYS 15200 MechanicsIUPUI Physics DepartmentPART II PEAK STATIC AND KINETIC FRICTIONTota
IUPUI - PHYS - 152
PHYS 15200 MechanicsIUPUI Physics DepartmentLab 05: Work and EnergyOBJECTIVEIn this experiment you will be verifying the relationship between the work done by aconservative force on an object and the change in its total mechanical energy.This experi
IUPUI - PHYS - 152
PHYS 15200 MechanicsIUPUI Physics DepartmentLab 05: Work and Energy WorksheetNameDatePartnersPART I WORK WHEN THE FORCE IS CONSTANTMass of 200-g standard weight =kgTime (s)Position (m)Start MovingStop MovingAverage force (N)Work done (J)Int
IUPUI - PHYS - 152
PHYS 15200 MechanicsIUPUI Physics DepartmentLab 06: CollisionsOBJECTIVEIn this experiment you will be investigating elastic and inelastic collisions in one dimension. Youwill be verifying the laws of momentum and mechanical energy conservation.This
IUPUI - PHYS - 152
PHYS 15200 MechanicsIUPUI Physics DepartmentLab 07: TorqueOBJECTIVEIn this experiment you will be measuring the moment of inertia indirectly using net torque andNewtons laws. You will then compare your result to the value calculated from standardfor
IUPUI - PHYS - 152
PHYS 15200 MechanicsIUPUI Physics DepartmentLab 07: Torque WorksheetNameDatePartnersDATA TABLESRadius R (m)Diameter d of vertical shaft (m)Radius r of vertical shaft (m)Mass of hanger (kg)Total hanging mass m = Mass of hanger + 0.200 kg = _ kg
IUPUI - PHYS - 152
PHYS 15200 MechanicsIUPUI Physics DepartmentLab 08: Simple Harmonic MotionOBJECTIVEIn this experiment you will be measuring the spring constant of a Hookes law spring by twodifferent methods. You will then compare your results to check whether the tw
IUPUI - PHYS - 152
PHYS 15200 MechanicsIUPUI Physics DepartmentLab 08: Simple Harmonic Motion WorksheetNameDatePartnersDATA TABLETrialTotal Hanging Mass(kg)Displacement (m)Angular Frequency(rad/s)12345678910ANALYSIS1. Use Excel or Logger Pro to plot
IUPUI - PHYS - 152
PHYS 15200 MechanicsIUPUI Physics DepartmentLab 09: FluidsOBJECTIVEIn this experiment you will be measuring the density of water and that of a solid usingArchimedes Principle.This experiment is adapted from Vernier Physics with Computers experiments
IUPUI - PHYS - 152
PHYS 15200 MechanicsIUPUI Physics DepartmentLab 09: Fluids WorksheetNameDatePartnersPART I - DETERMINING THE DENSITY OF WATERMass of graduated cylinder (without water) =Volume of Water (mL)Mass of Grad Cyl + Water (g)gramsMass of Water Only (g)
IUPUI - PHYS - 152
PRACTICE EXAM 1 PHYS 15200 NOTE1) Your official exam will have different questions.2) You will be tested on your mastery of concepts and problem-solving skills.3) You will be given a formula sheet to use during the exam.3) The solutions to this prac
IUPUI - PHYS - 152
PRACTICE EXAM 2 PHYS 15200 NOTE1) Your official exam will have different questions.2) You will be tested on your mastery of concepts and problem-solving skills.3) You will be given a formula sheet to use during the exam.3) The solutions to this prac
IUPUI - PHYS - 152
PRACTICE EXAM 3 PHYS 15200 NOTE1) Your official exam will have different questions.2) You will be tested on your mastery of concepts and problem-solving skills.3) You will be given a formula sheet to use during the exam.3) The solutions to this prac
IUPUI - PHYS - 152
Pre-Lab01: 1-D KINEMATICSNameDue at the beginning of the lab periodDirections: Select the graphs that best describe the motion of a point particle. The horizontal axisin each diagram is time; the vertical axis can be position, velocity, or acceleratio
IUPUI - PHYS - 152
Pre-Lab02: PROJECTILE MOTIONNameDue at the beginning of the lab periodConsider a particle launched at a horizontal velocity v0 from a height h above the ground.1. Derive an expression for the time it takes the projectile to strike the ground. Ignore a
IUPUI - PHYS - 152
Pre-Lab03: NEWTONS LAWSNameDue at the beginning of the lab periodTwo blocks are connected by a massless string that passes over a massless pulley. The block ofmass m1 sits initially on a flat frictionless surface, while the block of mass m2 hangs free
IUPUI - PHYS - 152
Pre-Lab04: FRICTIONNameDue at the beginning of the lab periodA block of mass m sits at rest on a surface inclined at angle .m 1. Draw a free-body diagram for the block. Make the x axis parallel to the incline.2. Suppose that the angle is increas
IUPUI - PHYS - 152
Pre-Lab05: WORK &amp; ENERGYNameDue at the beginning of the lab periodCSuppose you are given the 1-d conservative force Fc = 2 i , where C is a constant and x 0.x1. Determine the potential energy function U associated with Fc .2. Show that the work don
IUPUI - PHYS - 152
Pre-Lab06: COLLISIONSNameDue at the beginning of the lab periodMass m1 moving at constant velocity v1 along the x axis collides with mass m2 initially at rest.Assume that the two masses continue to move along the x axis after the collision.1. Determi
IUPUI - PHYS - 152
Pre-Lab07: TORQUENameDue at the beginning of the lab periodA massless string is wrapped around a vertical shaft of radius r. The string passes over amassless pulley and its free end is attached to a hanging mass m. The shaft is free to rotatewithout
IUPUI - PHYS - 152
Pre-Lab08: SIMPLE HARMONIC MOTIONDue at the beginning of the lab periodNameConsider a mass connected to a Hookes law spring oscillating along the x axis in simpleharmonic motion. The equation for the position of the mass is given by x(t) = Asin(t + ),
IUPUI - PHYS - 152
Pre-Lab09: FLUIDSNameDue at the beginning of the lab periodConsider a beaker filled partially with water sitting on a scale. The scale reads wb, the totalweight of the beaker and its water in air (Figure 1a). An object of mass m and volume V attached
IUPUI - PHYS - 152
EXAM 1A SOLUTIONS PHYS 15200 Part I. Multiple Choice Questions [2 pts each]1) C2) E3) B4) E5) CPart II. Word Problems [30 pts each]1) (A) Set v(t) = 0 and solve for t t = 4 sPlug into x(t) = 6t2 t3 x = 32 m = maximum(B) Plug 3 s into FNet = ma
IUPUI - PHYS - 152
EXAM 1B SOLUTIONS PHYS 15200 Part I. Multiple Choice Questions [2 pts each]1) A2) C3) C4) A5) DPart II. Word Problems [30 pts each]1) (A) a(t ) = 36 12t = 0 t = 3 s, so v(3 s) = 54 m/s = maximum(B) FNet = ma(2 s) = 120 N2) v0y = 1.5 m/s; vx = 4
IUPUI - PHYS - 152
EXAM 2A SOLUTIONS Part II. Word Problems [30 pts each]1) (A) At the top of the loop, FNet = N + mg =mv 2.rSet N = 0 to obtain minimum speed vmin = gr = 7.80 m/sN mg (B) Use conservation of total mechanical energy:21kx 2 = 1 mvmin + mg ( 2r
IUPUI - PHYS - 152
EXAM 2B SOLUTIONS Part II. Word Problems [30 pts each]1) (A) Use conservation of total mechanical energy:1mv 2 = mgh2h=L L 2v= 3.26 m = L(1 cos) = 54.42gh mv 2(B) At the bottom of the rope, FNet = T mg =.LT = m( g + v 2 /L) = 901
IUPUI - PHYS - 152
EXAM 3A SOLUTIONSPart I Multiple Choice Questions1) A 2) B 3) D 4) A 5) BPart II Word Problems1) 0 = 1200 rpm = 40 rad/s; = 5500 rpm = 550/3 rad/s 0(A) == 180 rad/s2t(B) = 1 ( 0 + )t = 140 rev2(C) = I = 1.62 N-m2)(A) I = 1/3ML2 + mr2 = 0.627
IUPUI - PHYS - 152
EXAM 3A SOLUTIONSPart I Multiple Choice Questions1) A 2) B 3) D 4) A 5) BPart II Word Problems1) 0 = 1200 rpm = 40 rad/s; = 5500 rpm = 550/3 rad/s 0(A) == 180 rad/s2t(B) = 1 ( 0 + )t = 140 rev2(C) = I = 1.62 N-m2)(A) I = 1/3ML2 + mr2 = 0.627
IUPUI - PHYS - 152
EXAM 3B SOLUTIONSPart I Multiple Choice Questions1) B 2) D 3) A 4) D 5) BPart II Word Problems1) 0 = 5000 rpm = 500/3 rad/s; = 440 rpm = 44/3 rad/s 0(A) == -133 rad/s2t(B) = 1 ( 0 + )t = 163 rev2(C) I = / = (-58 N-m) / (-133 rad/s2) = 0.437 kg
IUPUI - PHYS - 152
EXAM 3B SOLUTIONSPart I Multiple Choice Questions1) B 2) D 3) A 4) D 5) BPart II Word Problems1) 0 = 5000 rpm = 500/3 rad/s; = 440 rpm = 44/3 rad/s 0(A) == -133 rad/s2t(B) = 1 ( 0 + )t = 163 rev2(C) I = / = (-58 N-m) / (-133 rad/s2) = 0.437 kg
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