Manual

ManualsBrandsPASCO ManualsEquipmentPS-2141 Force Platform

Instruction Manual

012-09118B

Force Platform

PS-2141

Introduction

The PASPORT Force Platform, used with a PASPORT interface, continuously measures force (up to 4400 N or

1000 pounds) applied by a person or object. You can use the Force Platform to measure the static weight of a per-

son standing on it, or the dynamic vertical force involved in moving and jumping. It has the measurement range

and strength to accommodate people of all sizes and the sensitivity to measure smaller forces such as the weight

of a ball. Put the platform on the floor or tabletop to measure vertical force, or mount it on a wall to measure hor-

izontal force. With the optional handle set, you can use the platform to measure both “pulling” and “pushing”

force.

Included Equipment Part Number

Force Platform PS-2141

Required Equipment

PASPORT Interface

Compatible PASPORT interfaces include the Powerlink (PS-2001), Xplorer GLX (PS-2002), USB Link

(PS-2100), and others. See the PASCO catalog, visit www.pasco.com, or contact PASCO tech support for

more information. Xplorer (PS-2000) with firmware version 1.14 or earlier is compatible in computer-based

(non-logging) mode.

See PASCO catalog or www.pasco.com

Optional Equipment

Handle Set PS-2548

Summary of content (9 pages)

PAGE 1
In s t r u c ti on M an u a l 0 1 2 - 0 9 1 1 8B Force Platform PS-2141 Included Equipment Part Number Force Platform PS-2141 Required Equipment PASPORT Interface1 See PASCO catalog or www.pasco.com Optional Equipment Handle Set PS-2548 1Compatible PASPORT interfaces include the Powerlink (PS-2001), Xplorer GLX (PS-2002), USB Link (PS-2100), and others. See the PASCO catalog, visit www.pasco.com, or contact PASCO tech support for more information. Xplorer (PS-2000) with firmware version 1.
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Fo r c e P la t f o r m H o w It W o r k s How It Works When an object is placed on the Force Platform, it applies a force normal to the platform's surface; this force is the object's weight. Because the Force Platform does not move (much), the force applied by the floor to the platform's feet increases by an amount equal to the object’s weight. Each of the four feet is connected to a beam with a strain gauge, through which the platform's electronics measure the force.
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Model No. PS-2141 Safety in units of newtons (N). You can change these settings in the Experiment Setup window. (Click the Setup button to open the window.) In the Setup window you can also make the separate force measurement of each beam visible. For more instructions on using DataStudio, press F1 to open DataStudio's on-line help. Using the Force Platform with the Xplorer GLX If you are using an Xplorer GLX without a computer, press to start data collection.
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Fo r c e P la t f o r m Su g g e s te d A c ti v it ie s force versus time plot is the impulse. How does the impulse of jumping compare to the impulse of landing? Using the measured impulse, calculate your launch velocity. Compare the velocity measured by a motion sensor to the velocity calculated from the impulse. Why are they not necessarily equal? Horizontal Impulse Hang the Force Platform on a wall. Press the tare button.
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Model No. PS-2141 E x p e r im e n t : B o u n c i n g B a ll Experiment: Bouncing Ball Required Equipment Part Number Force Platform PS-2141 PASPORT Interface See PASCO catalog or www.pasco.com Inflated Rubber Ball In this experiment you will drop a ball on the Force Platform and allow it to bounce. In Part 1 you will examine the relationship between the impulse of a single bounce and the time between bounces.
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Fo r c e P la t f o r m (eq. 3) E x p e r im e n t : B o u n c in g B a ll V0 1 = --- gt 2 By measuring the hang times before and after a collision, we can calculate the speeds of the ball just before and just after the collision. (Note that we do not assume these speeds to be equal.) Using these speeds, we can calculate the change in momentum. The change in momentum can be compared to the impulse calculated using the area under the force versus time graph.
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Model No. PS-2141 E x p e r im e n t : B o u n c i n g B a ll 5. Set the sample rate of the platform to 5 Hz. Press the tare button. Place the ball on the platform and collect data for a few second. Use the measured force to calculate the mass of the ball (m). 6. Calculate the change in momentum of the ball: ∆P = m ( V up – V down ) If the ball left the platform slower than it hit, why is ∆P positive? 7. On the graph of force versus time, zoom in on the second bounce.
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Fo r c e P la t f o r m E x p e r im e n t : B o u n c in g B a ll Sample Data and Teachers’ Notes Part 1 The ball is allowed to bounce three times. Before the second bounce, the hang time is 0.832 s. V down 2 1 1 = – --- gt before = – --- ( 9.81 m/s ) ( 0.832 s ) = – 4.08 m/s 2 2 After the second bounce, the hang time is 0.730 s. V up 1 1 2 = --- gt after = --- ( 9.81 m/s ) ( 0.730 s ) = 3.58 m/s 2 2 The weight of the ball is 5.74 N; thus m = 0.585 kg, and ∆P = m ( V up – V down ) = ( 0.
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Model No. PS-2141 S p e c if i c a t io n s Specifications Range −1100 N to +4400 N (−250 pounds to +1000 pounds) Resolution 0.1 N Maximum Sampling Rate 2000 Hz with Xplorer GLX, 1000 Hz with other PASPORT interfaces Zero (Tare) Function Push Button Platform Size 35 cm × 35 cm Mass 4 kg Force Overload Protection Up to 6600 N (1500 pounds; 1700 N or 375 pounds per beam) Technical Support For assistance with any PASCO product, contact PASCO at: Address: PASCO scientific 10101 Foothills Blvd.