3B SCIENTIFIC PHYSICS U8405100 Bedienungsanleitung Seite 6

3. Technical data
Friction track:
U-shaped track:
Protractor:
Sliding friction surface:
Material:
Length:
Friction body A:
Dimensions:
Material:
Surface:
Surface area ratio:
Weight:
Fastening rings:
Friction body B:
Dimensions:
Material:
Surface:
Weight:
Additional weights:
Design:
Weight:
Sliders:
Design:
Material:
Surface:
Dimensions:
Friction body C:
Dimensions:
Surface:
Weight:
Securing rings:
Castors:
Dynamometer:
Measuring range:
600 × 80 × 20 mm
3
0° – 60°
PVC, smooth on one side
and coarse on the other
side
850 mm
79 × 38 × 73 mm
3
PVC
Uncoated
2:1
325 g approx.
2
73 × 20 × 47 mm
3
PVC
Coated with velour paper
100 g approx.
To fit friction body B
100 g
To fit friction body B
Aluminium
Rubber-coated (No. 1),
Teflon-coated (No. 2),
Uncoated (No. 3)
3
55 x 55 x 15 mm
75 × 31 × 105 mm
3
Coated with velour paper
325 g
2
2, ball-bearings
2 N, tension and com-
pression
•
Secure the dynamometer by means of the
clamp.
•
Attach a stopper for the friction body directly
to the right of the gap in the U-shaped track
(the stopper prevents any sudden recoil of the
friction body that might arise as the sliding
friction surface is pushed back.)
5. Measurements conducted on a horizontal
•
Align the friction track so that the pointer on
the protractor is in the zero position.
•
Insert the sliding friction surface into the fric-
tion track either with its smooth or coarse fac-
ing down. Then place a friction body onto the
sliding friction surface. (See Fig. 1 and Fig. 2.)
5.1 Static friction:
•
Pull the sliding friction surface, making sure it
is displaced with a uniform motion.
•
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.
5.2 Sliding friction:
•
Conduct measurements as described under 5.1.
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.
This value represents a measure of the sliding fric-
tional force.
Fig. 1: Investigation of static and sliding friction with
friction body A with two different contact areas.
2
4. Set-up
friction plane