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Neco 2019 Physics practical questions*
No1. You are provided with a uniform metre rule, a knife edge, some masses and other necessary  materials.

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(i) Determine and record the centre of gravity of the metre rule
(ii) Fix the 100g mass marked N at a point Y, the 80cm mark of the rule  using a sellotape.
(iii) Suspend another 50g mass marked M, at X a distance A = 10cm from the 0cm mark of the rule.
(iv) Balance the arrangement horizontally on the Knife edge as illustrated in the diagram above

(v) Measure and record the distance B of the knife edge from the 0cm mark of the rule.
(vi) Repeat the procedure for four other values of A = 15cm, 20cm, 25cm and 30cm.
(vii) Plot a graph with B on the vertical axis and A on the horizontal axis.
(ix) Determine the slope, S, of the graph.
(x) Also determine the intercept, C, on the vertical axis.
(xi) Evaluate:

alpha k1 = (1-2s)/2 * 100

beta k2 = 2c/s - 160

(xii) State two precautions taken to obtain accurate results.

(b) (i) Define moment of a force about a point.
(ii) State two condition under which a rigid body at rest remains in equilibrium when acted upon by non-parallel coplanar forces.
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