PASCO ME-9447B User Manual
®
Instruction Manual
Super Pulley with
Clamp (3)
String Tie
Assembly
(3)
Nylon
Thread
Force Table with 3
detachable legs
Stacking
peg
Storage
recess
String Tie
Assembly
012-13471A
*012-13471*
PASCO Mechanics
Super Pulley Force Table
ME-9447B
®
Super Pulley Force Table
Table of Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
About the Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Experiment 1: Vector Addition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Protractor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Warranty, Copyright, and Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2
ME-9447B 012-13471A Introduction
®
Outer part snaps into
the Force Table
Clear
disk
Thread strings
through this hole.
Ring on
label
Introduction
Included Equipment Quantity Included Equipment Quantity
Force Table Assembly with Legs 1 String Tie Assembly 3
Super Pulley with Clamp 3 Spool of Thread 1
The Super Pulley Force Table includes equipment for vector addition experiments. You will also need masses,
mass hangers, and a balance..
Required Equipment Recommended Equipment
Mass and Hanger Set (ME-8979) Mass Balance (see PASCO catalog)
This manual contains descriptions of the included equipment and instructions for one experiment.
About the Equipment
The PASCO Model ME-9447B Force Table is used to physically demonstrate the addition of vectors using the
concept of equilibrium (net force is zero). The vectors are forces supplied by the weight of masses (not included)
that hang over pulleys. Masses hanging over pulleys placed at given angles are balanced by another mass over a
pulley at another angle.
Among the features of the Force Table are:
• It is lightweight. (NOTE: Do not exceed 200 grams (0.20 kg) on each pulley.)
• It can be stored in a small space.
• The pulleys are low friction.
• The adjustable pulley clamps allow the string to be positioned close to the angle markings on the table, reducing the parallax error in reading the angle.
• Equilibrium is achieved when the String Tie Assembly is centered in the middle of the Force Table.
The Force Table has three detachable legs that can be stored in the leg holders and clips on the underside of the
table and the table includes spare String Tie Assemblies.
String Tie Assembly
The circular String Tie Assembly has two main parts: a clear disk
through which the strings are tied and which is free to move from side to
side over a short distance, and the outer part that snaps into the center of
the Force Table. The label on the outer part has a ring that shows when
the clear disk is centered.
3
Super Pulley Force Table Introduction
®
Storage
clip
Threaded
hole
Leg
holder
Underside of
Force Table
1. Remove a leg from its
storage clip and holder.
2. Line up the leg screw
with a threaded hole.
3. Rotate the leg into the
threaded hole.
1.
2.
3.
ME-9448B
Super Pulley
with Clamp
Clamp
Thumbscrew
Yoke
Storage recess
Stacking
peg
String
Tie the ends
together.
• Assemble the Force Table
• Turn the Force Table upside
down..Remove a leg from its storage clip
and holder.
• Line up the leg screw with a threaded
hole in the underside of the Force Table.
• Rotate the leg clockwise (left-to-right)
until it is firmly attached to the table.
• Repeat for the other legs.
NOTE: Do not tighten the legs more than
“finger tight”. They will be removed later for
storage.
• Turn the Force Table right side up.
Attach the Pulleys
Attach three of the ME-9448B Super Pulley
with Clamp to the edge of the force table.
Each clamp has two positions for holding the
pulley yoke. You may want to move the pulley yoke to the lower position so that the top
edge of the pulley can be more easily aligned
with the top surface of the table. To do this,
unscrew the thumbscrews on both sides of the
clamp. Arrange the pulley yoke so the holes
in the yoke are aligned with the lower
threaded holes of the clamp. Replace the two
thumbscrews but do not overtighten. NOTE:
Each thumbscrew has a slotted head. If the
thumbscrew is too tight, use a flat blade
screwdriver to loosen it.
NOTE: If more than two forces are to be
added, use the desired number plus one pulley
and clamp for the equilibrium force.
Attach the Strings.
Get three pieces of string (thread), each about 30 centimeters long. Twist
the ends of the strings together and thread the three strings through the
hole in the middle of the clear plastic disk on the String Tie Assembly.
Pull the ends of the threads through the hole and tie them together with an
overhand knot so that the strings cannot be pulled back through the clear
plastic disk
Insert the String Tie Assembly
The String Tie Assembly fits into the circular recess in the middle of the Force Table. The circular recess has two
rectangular holes in the bottom and two shallow notches on its edge. The two short “legs” of the outer part of the
4
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