Owner manual

3B Scientific GmbH • Rudorffweg 8 • 21031 Hamburg • Germany • www.3bscientific.com
Subject to technical amendments.
© Copyright 2008 3B Scientific GmbH
5. Instructions
• Place the sensor box near the experiment and
fix the accelerometer (the small black box)
firmly to the body for which the acceleration is
to be measured (the target) using either the
Velcro strip supplied or a screw fixing.
• Read off the value of the acceleration on the
display of the 3B NETlog
TM
unit.
6. Applications
Experiments using roller or air-cushion tracks:
Measurements of acceleration during elastic and
inelastic collisions
Measurements during circular motion in a
horizontal plane:
Relationships between acceleration and period,
radius, mass
Measurements involving circular motion in a
vertical plane
Experiments involving jumping, landing with knees
stiff and knees loose
Outdoor experiments:
In a car, bungee-jumping, skiing, or cycling, a big
dipper
7. Sample Experiments
Recording acceleration behaviour during
skipping-rope activity
Equipment needed:
1 3B NETlog
TM
unit U11300
1 3B NETlab
TM
software U11310
1 Accelerometer, ±25g U11362
• In 3B NETlab
TM
, open the application (template)
for experimenting with the ±25g
accelerometer.
• Attach the accelerometer to one person’s ankle
using a Velcro strip or a bandage.
• Jump over an real or imaginary skipping-rope
for a period of 10 seconds.
• Simultaneously start the recording of an
experimental data curve in 3B NETlab
TM
(Fig. 1).
• Interpret the experimental curve.
Fig. 1 Typical acceleration behaviour at the ankle of a
skipping person, recorded with the 3B NETlab
TM
(U11310)
In Figure 1 it can be seen that, in addition to the
skipping acceleration signal, there is a constant
gravitational acceleration of 9.81 m/s², resulting in
a background value of 1g.