3B SCIENTIFIC 1000694 Manual Del Usuario página 7

Press the work disc with force onto the centre
•
rod.
• Place the washer onto the central bore and
screw in the mount for cords.
• Attach the pulleys with clamps at the posi-
tions on the work disc marked 0°, 120° and
240°.
• Place the ring above the mount in the centre
of the work disc.
• Run the cords over the pulleys, suspend the
weight holders and attach the slotted weights.
• The ring should be in a state of equilibrium.
4.2 Sample experiment: Vector Addition
Set up the force table as above.
•
• Add a 20 g mass to one weight holder and a
50 g mass to another at 0° and 120°.
• By adding weights to a third weight holder
and selecting a suitable angle it is possible to
establish equilibrium. To check the equilib-
rium, lift the ring and let it drop. If it falls back
to the centre, equilibrium has been attained.
If not, then further adjustments are neces-
sary.
• Calculate the magnitude and direction of the
forces required to attain equilibrium. Com-
pare the values obtained in the experiment to
those determined by the theory.
• Draw the forces to scale showing their magni-
tude and direction to confirm the law of the
triangle of forces.
• Repeat the experiment with different masses
and angles.
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