PASCO ME-9491 User Manual

Fan Accessory

battery compartment

Instruction Manual

012-06363G

ME-9491

slugs

slug/battery rack

power switch

Included Equipment Part Number

Fan Accessory

aluminum slugs (2)

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

Motion Sensor and a 750 interface or CI-6742 and CI-7500

PASport Motion Sensor and USB Link
with a USB enabled computer

ME-9491

CI-6529

PS-2103 and PS-2100

Smart Pulley and computer interface ME-9387

Friction Cart Accessory ME-9457

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Fan Accessory Introduction

Introduction

The PASCO ME-9491 Fan Accessory mounts on any PASCO Cart for use with a
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

Mass of Fan Accessory (with 4 AA

Energizer™ batteries and mass slugs)

Mass of aluminum slug approximately 20 g

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Note: The masses of batteries of different brands vary slightly.

approximately 310 g

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Assembly

assembly on the Dynamics Cart

Snap the sides of
the Fan Accessory
over the rails of the
Cart.

Figure 1. Attaching the Fan Accessory to the 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).

Use the aluminum
slugs as necessary
to complete the
electric circuit.

Figure 2. Supplying three different voltages by installing two, three or four batteries.

2. Store unused batteries or slugs in the storage rack on the top of the Fan Acces­sory.

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Model No. ME-9491 Suggested Experiments

3. Vary the mass of the Fan Accessory by placing or removing the slugs or batteries
in the storage rack.

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Suggested Experiments

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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 propel­ler and repeat (Figure 3)

.

rubber bands

Fan Accessory

V

force

Figure 3. Measuring the acceleration of the cart.

air flow

Motion Sensor

cart

Dynamics Track

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)

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air flow

Note: To prevent the Fan Acces­sory from popping off the cart dur­ing a collision with a wall or End
Stop, secure it to the cart with the
included rubber bands as shown in
Figure 3.

hanging mass

Figure 4. Determining the fan’s force (method 1).

Alternative method: Use a spring scale to determine the fan’s force at three different
propeller speeds (Figure 5)

.

air flow

force

Figure 5. Determining the fan’s force (method 2).

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For a discussion of fan cart experiments, refer to Robert A. Morse, “Constant Accelera-

spring scale

tion Experiments with a Fan-Driven Dynamics Cart,” The Physics Teacher, October, 1993,

pp. 436-438.

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Fan Accessory Technical Support

Experiment #3: Counteract the fan’s force with the force of gravity by inclining the
track until the cart cannot climb it. Vary the fan speed and repeat (Figure 6)

.

force

Figure 6. Counteracting the fan’s force with gravity.

Experiment #4: Counteract the acceleration due to the fan’s force with fric­tion by attaching a Friction Cart Accessory to the Dynamics Cart and adjust­ing the friction until the cart moves at constant speed. Vary the fan speed and
repeat (Figure 7).

force

Figure 7. Counteracting the acceleration of the cart with friction.

Technical Support

For assistance with any PASCO product, contact PASCO at:

Address:

Phone:

Fax: [phone]

Web: www.pasco.com

Email: [e-mail]

Limited Warranty

For a description of the product warranty, see the PASCO catalog.

PASCO scientific
10101 Foothills Blvd.
Roseville, CA 95747-7100

916-786-3800 (worldwide)
800-772-8700 (U.S)

air flow

Friction Cart
Accessory

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 labora­tories and classrooms, and are not sold for profit. Reproduction under any other circumstances, without the written consent of PASC O
scientific, is prohibited.

Trademarks

PASCO, PASCO scientific, DataStudio, PASPORT, and ScienceWorkshop are trademarks or registered trademarks of PASCO scien­tific, 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.

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