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Physics Practicals Waec 2016 Free Expo Answers


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1i)
Centre of gravity =50.5
TABULATE
S/N-A(cm)-B(cm)
1-10.0-51.90
2-15.0-53.50
3-20.0-53.80
4-25.0-54.90
5-30.0-55.80
1xii)
-I avoided the effect of draught during the experiment
-I avoided error due to parallax on the metre rule
-I balanced the metre rule horizontally on the knife edge before taking my readings
1bi)
Moment of a force about a point is the product of the force and its perpendicular distance from the point to the line of action of the force. i.e moment=force*time and its unit is Nm
1bii)
-Sum of forces acting in one direction must equal to the forces acting in another direction.
-The algebric sum of moment acting about a point must be equal to zero


2bi)Heat Capacity: is the amount of heat required to change its temperature by one degree, and
has units of energy per
degree.
1b i Moment of a force about a point
The moment of a force about a point O is defined as the vector product (cross product)
Mo= r × F
where r = xi + yj + zk is the radius vector (position vector) drawn from O to the point of
application A of the force F , and F = Fx + Fy + Fz is the force vector acting on A.






3)
TABULATE
S/N-E(v)-V(v)-I(A)-V^-1(v^-1)-I^-1(A^-1)
1-1.50-0.80-0.40-1.250-2.500
2-3.00-1.40-0.70-0.714-1.429
3-4.50-2.00-1.00-0.500-1.000
4-6.00-2.50-1.20-0.400-0.833
5-7.50-3.20-1.50-0.313-0.667

Precautions
-I tightened all the wires tightly together
-I ensured clean terminals
-I avoided zero error on the ammeter used

3bi)
-By using electric cells
-By using electrostatic method

3bii)
For parallel connection=1/R=1/R+1/R
2Rt=R
Rt=R/2ohm
Total=(R/2)+2
4=(R/2)+2
4=(R+4)/2
8=R+4
8-4=R
R=4ohm









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