PASCO ME-6991 User Manual Download

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Bridge Set

ME-6991

I n s t r u c t i o n M a n u a l

0 12 - 10 6 5 6 D

*012-10656*

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Summary of Contents for ME-6991

Page 1: ... Bridge Set ME 6991 Instruction Manual 012 10656D 012 10656 ...

Page 2: ...gles 7 Trusses 8 Common Truss Bridges 9 Different Scales 9 Measuring Bridge Deflection Under Load 11 Bridge Challenges for Students 12 Measuring Static and Dynamic Loading 12 Bridges That Require Two or More Bridge Sets 13 Dynamics Track 14 Rollercoaster Design Challenges 14 Technical Support 16 Limited Warranty Copyright Trademarks and Patents Pending 16 ...

Page 3: ...uipment Qty A 5 Beam 24 cm long 16 I Mini car Starter Bracket 1 B 4 Beams 17 cm long 36 J Mini car 1 C 3 Beams 11 5 cm long 36 K Photogate Flag 1 D 2 Beams 8 cm long 16 L Mini car Mass about 200 g 1 E 1 Beams 5 5 cm long 16 M Road Bed 3 m 1 F Half Round Connector 28 N Road Bed Coupler 2 G Screw 6 32 150 O Cord Tensioning Clip 32 H Road Bed Clip 24 P Yellow Cord 76 m A B C D E F G L I J K H M N O P...

Page 4: ... four 100 N Load Cells PS 2200 Load Cell Amplifier PS 2198 Can plug in up to six Load Cells requires a PASPORT interface to connect to the USB port of a computer 100 N Load Cell PS 2200 Strain gauges mounted on a beam no electronics so a Load Cell requires the Load Cell Amplifier PS 2198 The Bridge Set includes beams brackets screws cord tensioning clamps a Mini car and a flexible road bed for bui...

Page 5: ...ad Bed To attach the blue road bed to the cross members of a bridge first connect the road bed clips to the underside of the road bed by twisting the clip into the slot so the edges of the slot capture the clip see Figure 7 Slide the clip in the slot a short distance to align it with the cross member of the bridge Using the Road Bed Coupler Each end of the coupler is inserted into the slot on the ...

Page 6: ...asure the time between the events when the infrared beam is blocked The Accessory Photogate with Stand PASCO Model ME 9204B is useful as a free standing photogate Adding Load Cells To measure the compression and tension forces in individ ual members add load cells PASCO Model PS 2199 to any PASCO Structure Replace a beam with two shorter beams and a load cell 5 beam load cell two 3 beams 4 beam lo...

Page 7: ...ctory calibrated however you can recalibrate them in software or on the datalogger See the documentation for your software or datalogger for instructionsWhen calibrating a load cell it is necessary to apply a known load Assemble the fixture shown in Figure 12 to support the load cell Hold or clamp the fixture at the edge of a table and hang a mass from it as shown Note that the hanging mass applie...

Page 8: ...re connect two trusses with 4 beams Figure 14 Add cross bracing to increase stiffness Queenpost Truss To make a queenpost truss separate the kingpost truss in the middle and add a square section Legs can be added to any truss or bridge Figure 15 4 4 4 5 5 Figure 13 A simple kingpost truss Figure 14 Left A three dimensional kingpost truss structure Right Kingpost truss with cross bracing 4 4 4 4 4 ...

Page 9: ... one side of the bridge on a table Then build the other side of the bridge Join the two sides of the bridge attaching the floor beams and the top cross beams Use additional members as piers to support the bridge Figure 18 Different Scales It is possible to build bridges of two different scales In Figure 19 is a Warren with Verticals built to two differ ent scales 4 4 4 4 4 4 5 5 5 Figure 16 Roof t...

Page 10: ... the smaller bridge is the same as the same member in the larger bridge Each additional panel is submitted to larger forces This can be explored using load cells See the section on Measure ment of Static and Dynamic Loads Figures 20 through 23 show additional common types of bridges Investigate how the forces in these bridges dif fer from the Warren Figure 20 Top Pratt Bottom Howe 4 5 3 3 Figure 2...

Page 11: ...tom of the weight hanger A graph of the deflection as a function of the load is shown next to Figure 24 Hint For the GLX set the Motion Sensor sample rate to 50 Hz In the Sensor Setup window change the Reduce Smooth Averaging from Off to 5 points Using Load Cells Figure 25 shows two bridges of the same type but dfferernt scale For a given load the deflection is different Also note that the forces ...

Page 12: ...oad that the bridge must be able to bear The bridge that has the least defection is the winner Measuring Static and Dynamic Loading Static Load Apply a static load to the bridge by hanging a hooked mass from one of the floor beams and insert load cells into the structure as shown in Figure 26 Loosen all the screws in the struc ture so the members are resting on their pins This will eliminate any e...

Page 13: ...Arch Bridge is constructed using the I beams sideways for the arched part of the bridge Since the I beams bend more in this orientation they form a curve The beams used in this manner will take a set and be permanently bent Figure 28 Tied Arch Bridge Figure 29 Long Warren Bridge 5 3 3 4 Figure 30 Subdivided Warren Bridge 3 3 4 4 5 ...

Page 14: ... be used with the pulley to measure the rotation of the pulley The Photo gate Pulley System ME 6838 and the Table Clamp ME 8995 are available separately from PASCO See Figure 33 Ramp and Photogate A ramp is shown in Figure 34 with a Photo gate ME 9204B to measure the speed of the Mini car at the bottom of the ramp during a Conservation of Energy experiment The Mini car is supplied with a photogate...

Page 15: ... it around the loop Measure the forces on the track at the bottom and the top of the loop and make the force zero at the top of the loop See Figure 36 Ski Jump Design Challenge Design a ramp that will launch the Mini car as far as possible away from the edge of the table See Figure 37 Figure 36 Loop Design Figure 37 Ski Jump Design ...

Page 16: ...other countries All other brands products or service names are or may be trademarks or service marks of and are used to identify products or services of their respective owners For more information visit www pasco com legal Patents Pending The following PASCO products have patents pendng Address PASCO scientific 10101 Foothills Blvd Roseville CA 95747 7100 Phone 916 786 3800 worldwide 800 772 8700...

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