# 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 Ã— 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

======================

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 Ã— 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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