Physics 3(Practical) (Alternative A)(1st set) – 9:30 – 12:15pm
Physics 3(Practical) (Alternative A)(2nd set) – 12:45pm – 3:30pm
(i) I ensured that the metre rule balances horizontally before readings are taken in order to avoid experimental error.
(ii) I ensured that parallax error was avoided when taking the readings on the metre rule by viewing its calibrations vertically.(1bi)
The moment of a force about a point is defined as the effect of force about that point.
Moment of a force = force × perpendicular distance of its line of action from the point.Moment = F × h
The S.I unit is Newton-metre(Nm). It is a vector quantity(1bii)
Draw the diagram
X = 50 – 25 = 25cm
y = 80 – 50 = 30cm
From the principle of moment :
Sum of clockwise moment = sum of anticlockwise moment
60x = M × y
60×25/30 = M×30/30
M = 60×25/30 = 6×25/3 = 2×25
M = 50g
E = 3.00V
R(ohms) | I(A) | V(v)
1.0 0.40 0.65
2.0 0.35 0.58
4.0 0.28 0.50
6.0 0.22 0.45
8.0 0.18 0.40
(i) I avoided error due to parallax when reading the ammeter and voltmeter.
(ii) I ensured tight connections.
(i) It increases current supplied.
(ii) It makes up for any defect in any of the cells.