Phys 1 Student Workbook.pdf

Physics Labs with Computers, Vol. 1Student WorkbookP06: Acceleration Due to Gravity 012-07000AAbout the Motion SensorThe Motion Sensor sends out pulses ofPULSEultrasound and picks up the echoes ofultrasound that bounce back from objects inECHOfront of it.The software program keeps track of theOBJECTtime when the pulses go out and the timewhen the echoes come back. One-half of theround trip time is the time that it took for theultrasound to reach the object. SinceMOTION SENSORultrasound travels at the speed of sound, orabout 344 meters per second (or about 700 miles per hour), the program figures out how faraway the object is as follows:round − trip timedistance to object = × speed of sound2The speed of sound through air depends on several factors, including the temperature of the air.Because the temperature of air can change, the speed of sound can change. You can calibrate theMotion Sensor so it uses an accurate measurement of the speed of sound.PART I: Computer Setup1. Connect the ScienceWorkshop interface to thecomputer, turn on the interface, and turn on thecomputer.2. Plug the modular connector on one end of theinterface cable into the side of the MotionSensor. Connect the stereo phone plugs of theMotion Sensor to Digital Channels 1 and 2 on theinterface. Connect the yellow plug to DigitalChannel 1 and the other plug to Digital Channel 2.3. Open the file titled as shown:500 scientificDataStudio ScienceWorkshop (Mac) ScienceWorkshop (Win)P06 Gravity.ds G14 Gravity G14_GRAV.SWS• The DataStudio document has a Workbook display. Read the instructions in the Workbook.• The ScienceWorkshop document has a Graph display of Position and Velocity versusTime.• The Trigger Rate for the Motion Sensor is 60 times per second (60 Hz).PASCOInterfacescientific300PASCOANALOG CHANNELSScience W orkshop DATA LOGGING INSTRUCTIONSScienceWorkshopInterfacep. 36 © 1999 PASCO scientific P06