(
Date:
Class:
Skill
)
You will learn to:
• balance clockwise and anticlockwise moments by applying different weights to a metre rule at
various distances from the pivot.
Experiment 5
Verification of the Principle
of Moments
Theory:
State the Principle of Moments.
Aim:
To verify the Principle of Moments
Apparatus:
metre rule (with small hole drilled at 50 cm mark)
smooth optical pin (at least 5 cm long)
50 g, 100 g masses
plasticine
retort stand
thread
split cork
Experiment 5 for Chapter 5
Turning Effect of Forces
Name:
d2
d1
metre rule
50 g
optical
pin
100 g
▲ Figure 5.1
Procedure:
1.
Insert the optical pin through the small hole in the metre rule. Place the sharp end
of the pin inside a split cork.
2.
Clamp the split cork such that the split surfaces are horizontal and sandwich the
sharp end of the pin at a height of about 25 cm above the bench. Ensure that the
optical pin is horizontal.
The sharp end of the optical pin should be completely covered by the split cork to
avoid injuries.
3.
Check that the metre rule is able to rotate freely about the pin in both directions.
4.
Balance the metre rule about the pivot by fixing a suitable amount of plasticine at
its lighter end, if necessary. The attached plasticine remains a part of the metre
rule for the rest of the experiment.
© 2013 Marshall Cavendish International (Singapore) Private Limited
(S)PMPB_05.indd 53
Experiment 5
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13/6/13 2:58 PM