PASCO Specialty & Mfg. ME-9871 User's Manual
Contents
1. Classic 1 2 m or 2 2 m Dynamics Track ME 9435 or ME 9458 Power Amplifier CI 6552A or PS 2006 PAScar 1 2 m or 2 2 m Dynamics Track ME 6953 or ME 6954 Motion Sensor CI 6742 or PS 2103 PAStrack 1 0 m ME 6960 Force Sensor CI 6537 or PS 2104 Dynamics Track Mount Cl 6992 Rotary Motion Sensor Cl 6538 or PS 2120 Track String Adapter ME 6569 PASCO Interface and data acquisition software See the PASCO catalog or the web site at www pasco com for more information Introduction The ME 9781 Variable Speed Motorized Cart incorporates many features of other PASCO carts including precision bearing wheels and an accessory tray The cart also has a regulated voltage and motorized rear wheels that are geared to operate at constant speed The speed control knob adjusts the speed from 8 centimeters per second cm s to 25 cm s The speed of the cart can also be varied automatically and remotely using the Time Pulse Accessory DC power supply or a PASCO Interface An external voltage source such as the Time Pulse Accessory connects to the External Input Port on the cart The motion of the cart can be measured in different ways You can use a PASCO Interface and a Motion Sensor or Rotary Motion Sensor The motion can also be measured using a plastic picket fence ME 8933 or ME 9804 that fits into the slots of the acces sory tray and a Photogate Head ME 9498A connected to a Smart Timer ME 8930 Photogate Timer ME 9215B or PASCO2. Interface You can also measure the motion using a measuring tape PM 8761 or SE 8712A or meter stick SE 8695 and a stop watch ME 1234 The features of the Variable Speed Motorized Cart expand the scope of experiments that are possible with the PASCO Dynamics System Carts and Tracks By powering the cart with a PASCO Interface and Power Amplifier the physical manifestation of sev eral different wave forms can be demonstrated Operation Battery Installation Install the C type alkaline batteries not included in the battery clip compartment on the bottom of the cart Estimated battery life is six hours or five kilometers km Manual ON OFF Start and stop the cart manually using the ON OFF switch Speed Adjustments Adjust the speed manually by turning the Speed Control Knob Turning the knob clockwise increases the speed Turning the knob counterclockwise decreases the speed 2 IZEIA ME 9781 012 06880B Operation External Voltage Source Switch the ON OFF switch to OFF EXT The cart can now receive power from the external voltage source and the battery is shut off CAUTION Never supply the Variable Speed Motorized Cart with external source voltages greater than 6 volts Use the included cable to connect the External Input Port EXT INPUT on the cart to an external voltage source Remote Control through a PASCO Interface 1 Switch the voltage input to external by moving the ON OFF switch
3. percent efficiency is x 100 mechanical power electrical power See Figure 6 for an example of typical experimental results Consiant Acceleration versus Constant Velocity Compare the effect of a constant acceleration for measured time versus constant velocity for a measured time Use the Time Pulse Accessory to supply power for a constant time to the Variable Speed Motorized Cart and compare its motion to that of a Fan Cart Accessory that has been supplied with power for the same time period see Figure 7 Time Pulse Accessory Fan Cart Accessory Time Pulse Accessory tracks Motorized Cart Figure 7 Constant Acceleration versus Constant Velocity PAS C OR 5 Variable Speed Motorized Cart ME 9781 Track the position versus time of the Variable Speed Motorized Cart and the Fan Cart using two Rotary Motion Sensors and Track String Adapters See Fig ure 8 for an example of typical experimental results Alternatively collect data on the Variable Speed Motorized Cart using the Rotary Motion Sensor and Track String Adapter and then collect data on the Fan Cart using a Time Pulse Accessory set to the same time interval In this manner both runs can be plotted on the same graph display showing the differ ence in position versus time for constant acceleration and constant velocity nstant l
4. to OFF EXT The cart can now receive power from the external source and the battery is shut off 2 Connect the Variable Speed Motorized Cart to the PASCO Interface e If you are using a PASCO 750 ScienceWorkshop Interface and Power Amplifier use the included cable to connect the External Input Port EXT INPUT on the cart to the power output ports on the Power Amplifier e Ifyou are using a PASCO 850 Universal Interface use the included cable to connect the External Input Port on the cart to the power output ports of the 850 Interface 3 Start the PASCO data acquisition software such as DataStudio or Capstone and choose and adjust the signal that you want the interface to output See the software instructions for more information 4 In the software click ON in the signal control window to start outputting the signal 5 Click OFF in the signal control window to stop outputting the signal ON OFF by Time Pulse Accessory ME 9496 1 Mount the PASCO Time Pulse Accessory on the Variable Speed Motorized Cart by inserting the studs on the bottom of the Time Pulse Accessory into the holes in the accessory tray of the cart External Input Port VARIABLE control knob NOTE Be sure that the ON OFF switch is in the OFF position before doing the next step 2 Plug the 3 5 mm phone plug of the Time Pulse Accessory cable into the External Input Port on the Variable Speed Motorized Cart Time Pulse START push accessory but
5. PASC OE rae 1 2 068808 Power NT Variable Speed Motorized Cart ME 9781 1 8 m Cable Accessory Tray Q ion Threaded Threaded Hole Hole Holes for ME 9496 Time Pulse Accessory Threaded ON OFF Switch External Input Port Maximum 6 VDC Speed Control Included Items Included Items Variable Speed Motorized Cart 1 8 m Cable Assembly 3 5 mm plug The PASCO Variable Speed Motorized Cart can use four C cells batteries that are not included NOTE The PASCO PI 6603 is a four pack of C sized alkaline batteries The cart can also be powered by a DC power supply such as the PASCO SE 9720 18 VDC 5A supply or by certain PASCO Interfaces such as the Science Workshop 750 Interface and the Power Amplifier IT CI 6552A or the Universal Interface 850 or the PASCO Xplorer GLX datalogger PS 2002 and GLX Power Amplifier PS 2006 The included cable has a 3 5 mm phone plug at one end and banana plugs at the other end The banana plugs can be connected to the output ports of the PASCO Power Amplifier for example The 3 5 mm plug fits into the External Input Port on the cart 800 772 8700 www pasco com Variable Speed Motorized Cart ME 9781 Other Equipment Recommended Equipment Recommended Equipment Starter Dynamics Track ME 9493 Time Pulse Accessory ME 9496 Force and Motion Track ME 6958 Ballistic Cart Accessory ME 9486
6. ized Cart friction block To the 9c oth voltage Og source interface Figure 10 Kinetic Friction and Speed 6 PAS C ON ME 9781 012 06880B Specifications Specifications Item Value Speed range 8 cm s to 25 cm s Battery life approximately 6 hours or 5 kilometers Battery power four C cells Regulated voltage yes Technical Support For assistance with any PASCO product contact PASCO at Address PASCO scientific 10101 Foothills Blvd Roseville CA 95747 7100 Phone 916 786 3800 worldwide 800 772 8700 U S Fax 916 786 7565 Web Www pasco com Email support pasco com For the latest revision of this Instruction Manual visit the PASCO web site and enter ME 9781A in the Search window Limited Warranty For a description of the product warranty see the PASCO catalog Copyright The PASCO scientific 012 06880B Variable Speed Motorized Cart Instruction Manual is copyrighted with all rights reserved Permission is granted to non profit educational institutions for reproduction of any part of this manual providing the reproductions are used only in their labo ratories and classrooms and are not sold for profit Reproduction under any other circumstances without the written consent of PASCO scientific is prohibited Trademarks PASCO and PASCO scientific are trademarks or registered trademarks of PASCO scientific in the United States and or in other countries All other bra
7. llel with the wall see Figure 3 The Motion Sensor will record the relative velocity of the Motion Sensor with respect to the wall Next orient the track so that it is perpendicular to the wall Repeat the data collection process The velocity measured by the Motion Sensor the sec ond time is the full velocity of the Motorized Cart Use the data acquisition software to plot both runs of data on a graph of velocity versus time Independence of Vertical and Horizontal Motion Mount a Ballistic Cart Accessory onto the Variable Speed Motorized Cart Arrange the equipment so that the Ballistic Cart Accessory will launch the ball while the cart is moving forward see Figure 4 Ballistic Cart Accessory Figure 4 Ballistic Cart Accessory Figure 2 Relative Motion wall F Lfeze ME 9781 012 06880B Suggested Activities Angle of Incline versus Efficiency Constant Force Explore the effect of the angle of incline of a track on the efficiency of the Variable Speed Motorized Cart Measure the speed of the cart at various angles of incline using a Motion Sensor or Rotary Motion Sensor with the Track String Adapter One way to mea sure the angle of incline is with a Rotary Motion Sensor and a Chaos Accessory see Figure 5 Rotary Motion string of Track Sensor String Adapter Chaos Accessory Figure 5 Efficiency vs Angle Plot the percent efficiency versus the angle of incline where
8. nds 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 PAS C ON 7
9. ocity Variable Force versus Efficiency Constant Angle of Incline Explore the relationship between varying force and efficiency when a Variable Speed Motorized Cart is climbing a track inclined at 30 Use the Rotary Motion Sensor and a Track String Adapter to measure the position of the cart Figure 8 Typical Data as it climbs the incline track see Figure 9 Track String Adapter Angle Indicator Variable Speed Motorized Cart To the interface Figure 9 Efficiency vs Varying Force Vary the voltage supplied to the Variable Speed Motorized Cart with a ramp down signal from the 750 ScienceWorkshop Inter face and Power Amplifier or the 850 Universal Interface Manifest Different Voltage Wave Forms Explore the effect of controlling the Variable Speed Motorized Cart with a variety of voltage wave forms such as sine wave square triangle ramp up ramp down etc from the PASCO Interface Plot the voltage and the position of the cart or the voltage and the speed versus time Independence of Kinetic Friction and Speed Determine the effect of speed on kinetic friction with a Force Sen PASCO sor mounted on the Variable Speed Motorized Cart Place a fric Carts 2 tion block on a track and put two PASCO carts accessory tray down on top of the friction block Use the Force Sensor to measure the kinetic friction see Figure 10 Force Sensor Motor
10. ton 3 Test the Time Pulse Accessory e Turn the TIME control switch on the Time Pulse Accessory to 0 0 1 SEC Figure 1 Time Pulse Accessory e Flip the ON OFF switch on the Variable Speed Motorized Cart to ON e Gently press the START push button on the Time Pulse Accessory After a two second delay the Motorized Cart should turn on automatically and run for one second before turning off automatically Test the other time intervals on the TIME control switch in the same manner PAS C OR 3 Variable Speed Motorized Cart ME 9781 NOTE When the TIME control switch is set to 3 select the time interval by using the VARIABLE control knob Turn the knob to MIN for a time interval under one second and turn the knob to MAX for a time interval of approximately seven seconds When using the VARIABLE control knob the time interval will be propor tional to the position of the knob For example half way between MIN and MAX is approximately 3 5 seconds Suggested Activities Relative Motion Use a piece of paper on the floor to simulate the motion of a river and simulate the relative motion of a boat crossing the river by moving the piece of paper while the cart is traveling over it see Figure 2 Vectors with Relative Motion Explore vectors by mounting a Motion Sensor at an angle on the Variable Speed Motorized Cart Place the track at an angle to the wall and position the Motion Sensor para
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