Force Plate
Contents
1. 353 Sept 2001 Warranty Vernier warrants this product to be free from defects in materials and workmanship for a period of five years from the date of shipment to the customer This warranty does not cover damage to the product caused by abuse or improper use Vernier Software amp Technology 13979 S W Millikan Way e Beaverton OR 97005 2886 Toll Free 888 837 6437 e 503 277 2299 e FAX 503 277 2440 info vernier com e www vernier com Rev 6 5 2012 Logger Pro Logger Lite Vernier LabQuest 2 Vernier LabQuest Vernier LabQuest Mini Vernier LabPro Go Link Vernier EasyLink SensorDAQ and other marks shown are our trademarks or registered trademarks in the United States TI Nspire CBL 2 and CBL TI GRAPH LINK and TI Connect are trademarks of Texas Instruments All other marks not owned by us that appear herein are the property of their respective owners who may or may not be affiliated with connected to or sponsored by us ae vay Printed on recycled paper2. that is designed for use with the Force Plate and you are ready to collect data Select the correct file 3500 N or 850 N to match your selected range setting on the sensor If you want to improve the calibration it is easy to recalibrate following the same procedure used in calibrating most Vernier probes a two point calibration One point is your zero with no force applied to the sensor Set the Force Plate on a level surface Select the calibration option of the program you are using and remove all force from the Force Plate Enter 0 zero as the first known intensity Now apply a known force to the Plate The easiest way to do this is to put an object of known weight on the Plate The weight should be at least 25 of the range used for the plate 200 or 850 N for example exercise weights could be used Enter the weight of the mass Note kg weighs 9 8 N Do not exceed the selected range setting during the calibration Calibrations are usually retained only for the current session Restarting the software opening a new file or choosing New from the File menu will reset the calibration to the default calibration To retain calibrations across sessions consult the instructions or help files appropriate to your software See also www vernier com til 2342 Suggested Experiments e Analyze a crouched jump Start with knees bent hands on hips Do NOT lower your body further jump up only Do not move arms This very artificial jump is ea
3. Force Plate Order Code FP BTA Designed for much higher forces than the Dual Range Force Sensor the Force Plate can measure the forces developed during stepping jumping and other human scale actions For example you can perform the following kinds of experiments e Observe the change in normal force during an elevator ride e Measure the impulse delivered by the floor during a jump e Measure the reaction force as a student leans against a wall Parts included with the Force Plate The Force Plate includes one pair of handles They can be attached either to the top or the bottom of the Force Plate Do not step on the Force Plate when the handles are attached Collecting Data with the Force Plate This sensor can be used with the following interfaces to collect data e Vernier LabQuest 2 or original LabQuest as a standalone device or with a computer e Vernier LabQuest Mini with a computer e Vernier LabPro with a computer or TI graphing calculator e Vernier Go Link e Vernier EasyLink e Vernier SensorDAQ e CBL 2 e TI Nspire Lab Cradle Here is the general procedure to follow when using the Force Plate 1 Connect the Force Plate to the interface 2 Start the data collection software 3 The software will identify the Force Plate and load a default data collection setup You are now ready to collect data Data Collection Software This sensor can be used with an interface and the following data col
4. ecommended for any industrial medical or commercial process such as life support patient diagnosis control of a manufacturing process or industrial testing of any kind Zeroing In some situations you may want to zero the Force Plate because changing the physical orientation of the sensor will change the reading when no force is applied After you have set up your experiment use your data collection software to zero the sensor Also in the case of experiments involving large impact forces you may need to zero the reading after one impact has taken place Specifications Force range 850 to 3500 N or 200 to 850 N where positive value is a compression force Maximum non damaging force 4500 N 1000 Ib compression or 900 N 200 Ib pull evenly distributed 12 bit resolution LabQuest 2 LabQuest LabQuest Mini LabPro Go Link TI Nspire Lab Cradle ULI 1 2 N or 0 3 N 10 bit resolution CBL 2 4 8 N or 1 2 N Dimensions 28 cm by 32 cm by 5 cm Calibration function slope gain 1000 N V or 250 N V intercept offset 1000 N or 250 N Force Vout 1000 N V 1000 N 3500 N range Force Vout 250 N V 250 N 850 N range This sensor is equipped with circuitry that supports auto D When used with LabQuest 2 LabQuest LabQuest Mini LabPro Go Link SensorDAQ TI Nspire Lab Cradle EasyLink or CBL 2 the data collection software identifies the sensor and uses pre defined parameters to con
5. figure an experiment appropriate to the recognized sensor The Two Switch Settings Resolution and Range As with any instrument there is a trade off between resolution the smallest force that can be measured and the range of forces that can be measured In general you should use the 850 N range if you can If the forces exceed 850 N you will need to use the 3500 N range In normal use the resolution with the different switch settings when used with a LabPro or LabQuest will be 1 2 N for the 1000 3500 N range and 0 3 N for the 200 850 N range The Handles Pushes and Pulls The Force Plate includes two handles with captive screws You can attach the handles to either the top or bottom of the plate Threaded holes for the handles are available on the bottom For use on the top you must remove four screws We recommend attaching the handles by the bottom of the Force Plate With handles in place you can support the unit by hand for pushing on a wall or other large object or you can attach an optional second pair of handles for pulling experiments order code FP HAN Note the maximum force in extension is much less than the maximum force in compression Optional Calibration Procedure You should not have to perform a new calibration when using the Force Plate You can use the appropriate calibration file that is stored in your data collection program from Vernier In many cases you can simply load an experiment file
6. lection software e Logger Pro 3 This computer program is used with LabQuest 2 LabQuest LabQuest Mini LabPro or Go Link e Logger Lite This computer program is used with LabQuest 2 LabQuest LabQuest Mini LabPro or Go Link e LabQuest App This program is used when LabQuest 2 or LabQuest is used as a standalone device e DataQuest Software for TI Nspire This calculator application for the TI Nspire can be used with the EasyLink or TI Nspire Lab Cradle e EasyData App This calculator application for the TI 83 Plus and TI 84 Plus can be used with CBL 2 LabPro and Vernier EasyLink We recommend version 2 0 or newer which can be downloaded from the Vernier web site www vernier com easy easydata html and then transferred to the calculator See the Vernier web site www vernier com calc software index html for more information on the App and Program Transfer Guidebook e DataMate program Use DataMate with LabPro or CBL 2 and TI 73 TI 83 TI 84 TI 86 TI 89 and Voyage 200 calculators See the LabPro and CBL 2 Guidebooks for instructions on transferring DataMate to the calculator e LabVIEW National Instruments LabVIEW software is a graphical programming language sold by National Instruments It is used with SensorDAQ and can be used with a number of other Vernier interfaces See www vernier com labview for more information NOTE Vernier products are designed for educational use Our products are not designed nor r
7. sier to analyze than a natural jump a Use the impulse of the force to find the change in momentum find the jumper s velocity at take off to estimate the jump height b Use the flight and kinematics to find the jump height From the force vs time graph determine an acceleration vs time graph Integrate to find velocity and position vs time graphs Construct a plot of force vs position and use that to determine the work done on the jumper s center of mass by the floor Since that work shows up as kinetic energy use the energy to find the velocity at take off e Repeat the above analysis for a natural jump beginning with standing straight crouching down and then jumping You will be able to jump higher this way but the analysis will be more complex e Investigate the forces involved during the technique known as unweighting during ski or snowboard turns Can you easily cut your apparent weight e Take the Force Plate on an elevator ride Stand on the Force Plate and record the force of the elevator floor on your feet as a function of time Explain Can you determine the speed of the elevator from the data References 1 R Cross Standing Walking Running and Jumping on a Force Plate Am J Phys 67 4 304 309 1999 2 N P Linthorne Analysis of Standing Vertical Jumps Using a Force Platform Am J Phys 69 11 1198 1204 2001 3 Haugland Physics Measurements for Sports Phys Teach 39 350
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