PASCO ME-9491 Instruction Manual

rubber bands Required Equipment Part Number 4 AA batteries Dynamics Cart or ME-9430 or ME-9454 PAScar or GOcar ME-6950 or ME-6951 Suggested Equipment Part Number Dynamics Track ME-9429A or ME-9452 Tape Timer or ME-9283 Motion Sensor and a Science Workshop™ computer interface or CI-6529 Motion Sensor and a 750 interface or CI-6742 and CI-7500 PASport Motion Sensor and USB Link with a USB enabled computer PS-2103 and PS-2100 Smart Pulley and computer interface ME-9387 Friction Cart Accessory ME-9457

Dynamics Track (ME-9429A or ME-9452) to demonstrate principles of motion. The self-propelled Fan Accessory facilitates students’ understanding of Newton’s Second Law of Motion because the fan produces the applied force, and all the mass of the system is in one place. The mass and force can be adjusted for a variety of force experiments. Specifications Assembly assembly on the Dynamics Cart Operation 1. Change the speed of the Fan Accessory by using two, three, or four batteries. When using less than four batteries, insert the slugs as necessary to complete the circuit (Figure 2). 2. Store unused batteries or slugs in the storage rack on the top of the Fan Acces- sory. Mass of Fan Accessory (with 4 AA Energizer™ batteries and mass slugs)1 approximately 310 g Mass of aluminum slug approximately 20 g 1Note: The masses of batteries of different brands vary slightly. Snap the sides of the Fan Accessory over the rails of the Cart. Figure 1. Attaching the Fan Accessory to the Cart Use the aluminum slugs as necessary to complete the electric circuit. Figure 2. Supplying three different voltages by installing two, three or four batteries.

Suggested Experiments1 3 3. Vary the mass of the Fan Accessory by placing or removing the slugs or batteries in the storage rack. Suggested Experiments1 Experiment #1: Measure the acceleration of the cart using the Motion Sensor, Smart Pulley or Tape Timer. Vary the mass of the Fan Accessory or the speed of the propel- ler and repeat (Figure 3) . Experiment #2: Determine the force of the fan by connecting the cart to a mass that hangs over a pulley. Adjust the hanging mass until the cart doesn’t move. Vary the fan speed and repeat (Figure 4) .- Alternative method: Use a spring scale to determine the fan’s force at three different propeller speeds (Figure 5) . 1 For a discussion of fan cart experiments, refer to Robert A. Morse, “Constant Accelera- tion Experiments with a Fan-Driven Dynamics Cart,” The Physics Teacher, October, 1993, pp. 436-438. Figure 3. Measuring the acceleration of the cart. air flow force V cart Dynamics Track Motion Sensor rubber bands Fan Accessory Figure 4. Determining the fan’s force (method 1). air flow hanging mass Figure 5. Determining the fan’s force (method 2). spring scale force air flow Note: To prevent the Fan Acces- sory from popping off the cart dur- ing a collision with a wall or End Stop, secure it to the cart with the included rubber bands as shown in Figure 3.

track until the cart cannot climb it. Vary the fan speed and repeat (Figure 6) . Experiment #4: Counteract the acceleration due to the fan’s force with fric- tion by attaching a Friction Cart Accessory to the Dynamics Cart and adjust- ing the friction until the cart moves at constant speed. Vary the fan speed and repeat (Figure 7). Technical Support For assistance with any PASCO product, contact PASCO at: Limited Warranty For a description of the product warranty, see the PASCO catalog. Copyright The PASCO scientific 012-06363G Fan Accessory 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 labora- tories and classrooms, and are not sold for profit. Reproduction under any other circumstances, without the written consent of PASCO scientific, is prohibited. Trademarks PASCO, PASCO scientific, DataStudio, PASPORT, and ScienceWorkshop are trademarks or registered trademarks of PASCO scien- tific, in the United States and/or in 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. 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: [email protected] Figure 6. Counteracting the fan’s force with gravity. force force air flow Friction Cart Accessory Figure 7. Counteracting the acceleration of the cart with friction.