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2.4 STATICS
( Periods 15)
 Parallel
forces
- Resultant of parallel forces, turning effect of
forces and moment of a force, couples.
Coplanar
forces
- Equilibrium of forces.
- Triangle of forces to represent forces in
equilibrium.
- Principle of moments.
- Centre of gravity.
Fluids in
static equilibrium
- Density, relative density.
- Pressure at a point in a fluid.
- Archimede's Principle
- Floatation
Assessment objectives:
By the end of this topic, the student should be
able to:
- Define centre of gravity.
- Calculate the resultant of parallel forces.
- Define and use moment of a force, couple and torque.
- State and use the conditions for equilibrium for
a system under the
action of coplanar forces.
- Solve problems related to three coplanar forces in
equilibrium.
- Define and use density and relative density.
- Derive and use the expression for pressure at a point
in a fluid.
- State and use Archimede's Principle.
- State the Law of floation and use it to solve problems
related to floating bodies.
- Perform and describe experiments involving the Principle
of moments.
End of S5 Term 1
( Estimated time : 8 Weeks)
UNIT
3 : PROPERTIES OF MATTER
3.1 Fluid Flow ( 9 Periods)
Streamline
and turbulent flow.
Terminal
velocity
Bernoulli's
equation.
Viscosity
in liquids and its determination.
- Poiseulle's and Stoke's law methods.
Viscosity
in gases.
Assessment Objectives.
By the end of this topic, the student should be able
to:
- Explain the terms steady ( lamina, streamline) and
turbulent flow as applied to the motion of a fluid.
- Explain the effects of viscosity of an object moving
in a fluid
- Define the terms velocity gradient and coefficient
of viscocity of a viscous fluid
and state their units.
- State Stoke's Law and use it to define the expression
for terminal velocity of a
sphere in a viscous fluid.
- Perform and describe an experiment to mesure viscocity
of a viscous liquid.
- Derive and use Bernoulli's equation P +
½ rv2 + rgh = a constant
- Explain the applications of Bernoulli's Principles
in the filter pumps, atomisers and
erofoil.
- Explain the effects of temperature on viscocity of
liquids and gases.
3.2
Deformation of Solids ( 9 Periods
)
Classification
of Solids on the basis of strength, stiffness, ductility
and
toughness.
Stress-strain curve for ductile and brittle materials.
Elastic and plastic behaviour.
Work done in extension and compression.
- elastic potential energy.
Assessment Objectives
By the end of this topic, the
student should be able to:
- Explain the term strength,
stiffness, ductility, toughness and elasticity.
- Define stress, strain, and
Young's modulus and state their units.
- Perform and describe an experiment
to verify Hooke's law using springs,
draw a sketch graph of the stress-strain
and show the following features:
limit of proportionality, elastic
limit, yield point, breaking point.
- Explain the special features
of the stress-strain graph for a ductile material.
- Distinguish the elastic behaviours
of ductile and brittle materials.
- Compare the elastic behaviours
of ductile materials, rubber and brittle materials.
- Perform and describe an experiment
to determine Young's modulus of a metal in
form of an elastic material.
- Relate the work done to the
elasic potential energy.
- Relate the work done to area
under the force-extension curve.
3.3
Surface Tension ( 12 Periods
)
Simple
surface tension phenomena.
Molecular
theory of matter
- Explanation of surface tension.
Definition
of surface tension.
Pressure
difference across a spherical surface.
Angle of
contact
Capillary
rise.
Methods
of measuring surface tension.
Effects
of temperature on surface tension.
Assessement Objectives
By the end of this topic, the
students should be able to:
- Perform and describe experiments
to show the existance of surface tension.
- Explain surface tension
in terms of molecular theory of matter.
- Define surface tension and
state its units.
- Derive and use expressions
for excess pressure inside air and soap bubbles.
- Describe an experiment to measure
angle of contact q.
- Explain capillarity.
- Derive and use the expression
h = 2g cos q
rgr
- Perform and describe an experiment
to measure surface using capillary.
- Explain the effects of
impurities on surface tension.
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