3B SCIENTIFIC PHYSICS U8405100 Bedienungsanleitung Seite 7

Fig. 2: Investigation of static and sliding friction with
friction body B with different weights (left) and different
materials constituting the contact surface, in that a
different surface coating is glued to the sliders (right)
6. Measurements conducted when the friction
plane is at an incline
The friction track can be inclined by an angle ϕ
from the normal. As a result, the normal force F
exerted by a weight G changes according to the
= ⋅ ϕ
equation: F G cos .
N
•
Align the friction surface so that the pointer of
the protractor is set to the desired inclination
(0 – 60°).
•
Insert the sliding friction surface into the fric-
tion track either with its smooth or coarse fac-
ing down.
•
Place friction body C onto the sliding friction
surface so that the castors on the narrow side
face downwards towards the track wall (see
Fig. 3).
6.1 Static friction:
•
Use a string to pull the sliding friction surface,
making sure it is displaced with a uniform mo-
tion.
•
Read the maximum value from the dyna-
mometer while the friction body is still being
dragged along with the sliding friction surface.
•
Perform this measurement on several occa-
sions and calculate the average.
This value represents a measure of the static fric-
tional force.
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3B Scientific GmbH • Rudorffweg 8 • 21031 Hamburg • Germany •
6.2 Sliding friction:
•
•
This value represents a measure of the sliding fric-
tional force.
N
Fig. 3: Measurements conducted with friction body C
when the friction track is inclined
Subject to technical amendments
© Copyright 2008 3B Scientific GmbH
Conduct measurements as described under 6.1.
However, take the reading on the dynamome-
ter as soon as the friction body has stopped
moving along with the sliding friction surface.
Perform this measurement on several occa-
sions and calculate the average.
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