EXPERIMENT NO. 2
The aim of this experiment is to verify the principle of
moments for parallel forces
Proceed as follows;
(a)
Find the centre of mass of
a metre rule by placing it on the knife edge. Find the balancing point and put
a mark on the point using a piece of chalk (or pencil).
(b)
Suspend 100gf = W2
on the 10cm length on the right from the centre of the mass G of the metre
rule. Suspend the 50gf = W1 on the left hand side of G and adjust the position
of W1 until the metre rule balances in a horizontal position. Read and record
the length “a” and “b” in the fig above
(c)
Repeat the process in (b)
above with W2 on the length 12.5cm, 15.0cm, 17.5cm, 20.0cm, 22.5cm and 25cm.
each time record the corresponding lengths “a” in the table below.
W1
(gf) |
W2
(gf) |
a
(cm) |
b
(cm) |
W1.a
(gf-cm) |
W2.b
(gf-cm) |
50
|
100
|
10.0
|
|||
12.5
|
|||||
15.0
|
|||||
17.5
|
|||||
20.0
|
|||||
22.5
|
|||||
25.0
|
(d)
(i) complete the table above
(ii) Compare the values in
columns W1.a and W2.b of the above table
(iii) State the principle of
moment for parallel forces
(iv) Comment on the relationship
in (ii) and (iii) above
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