Phys 1 Student Workbook.pdf

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Physics Labs with Computers, Vol. 1Student WorkbookP24: Conservation of Linear and Angular Momentum 012-07000AItemVertical DistanceTime of FlightValueTrialHorizontal Distance (m)12345AverageItemHorizontal Distance to edge of paperTotal Horizontal DistanceValueQuestionsLinear speed1. What is the percent difference between the value of the measured linear speed and theaverage value of the calculated linear speed of the ball?2. From the data, determine the kinetic energy of the ball as it left the launcher and therotational kinetic energy of the ball, catcher, and disk system.3. Based on this information, was kinetic energy conserved throughout the motion of the ball?Justify your answer.p. 178 ©1999 PASCO scientific P24
Name _____________________ Class ______________ Date _________Activity P25: Transforming Gravitational Potential Energy to KineticEnergy (Rotary Motion Sensor)Concept DataStudio ScienceWorkshop (Mac) ScienceWorkshop (Win)Energy P25 GPE to KE.DS (See end of activity) (See end of activity)Equipment Needed Qty Equipment Needed QtyRotary Motion Sensor (CI-6538) 1 Mass and Hanger Set (ME-9348) 1Balance (SE-8723) 1 Rotational Accessory (CI-6691) 1Base and Support Rod (ME-9355) 1 Thread (inc. w/ CI-6691) 1 mNoteFor this activity you need to know the rotational inertia of the disk that is part of the Rotational Accessory.Refer to activity “P22: Rotational Inertia” for information about how to measure the rotational inertia.What Do You Think?In this activity, a falling object applies a constant net torque to a rotatingdisk. As the object falls, its gravitational potential energy decreases and itstranslational kinetic energy increases. At the same time, the rotationalkinetic energy of the disk increases. How does the decrease in gravitationalpotential energy compare to the increase in translational and rotationalkinetic energy?Take time to answer the ‘What Do You Think?’ question(s) in the Lab Report section.BackgroundThe gravitational potential energy of an object depends on its weight and its vertical distance, h,relative to a reference point (usually the Earth’s surface). The gravitational potential energy is:P. E. = mghgravwhere m is the mass of the object and g is the acceleration due to gravity. The kinetic energy ofa rotating object depends on its rotational inertia, I, and its angular speed, ω. The rotationalkinetic energy is:KE . .rotational= 1 2Iω .2As the object falls, it has translational kinetic energy:K. E.= 1 2 mv2where m is the mass of the object, and v is its speed.SAFETY REMINDERS• Follow directions for using the equipment.P25 ©1999 PASCO scientific p. 179
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