EXPERIMENT NO. 3
The aim of this experiment is to determine the density of
wood. Your provided with wooden bar, a knife and a 100g weight
Proceed as follows;
(a) Locate the centre of
gravity C of the wooden bar by balancing freely about the knife edge
(b) Suspend the 100g mass on
the wooden bar as shown in the fig below; 10cm from C adjust the position of
the knife edge to get a balance.
(c) Record the distance of the
centre of gravity C from the knife edge as Y and distance between the knife
edge and 100g mass as X.
(d) Repeat procedures (b) and
(c) above by increasing the distance of the 100g mass to 20cm, 30cm, 40cm, 50cm
and 60cm respectively from the centre of gravity C. tabulate your results.
(e) Draw a graph of Y against X
and calculate its gradient (G).
Calculate the mass (M) of the wooden
bar given that gradient, $$G={100\over M}$$
(f) Measure the length l, width w
and thickness t of the wooden bar and hence calculate the density of
wood given that, $$Density\ of\ Wood={M\over lwt}$$
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