The lesson plan summarizes a physics lesson on elasticity for 11th grade students. The lesson will last 10 minutes and cover the key concepts of elasticity including stress, strain, and elasticity modulus. The teacher will begin with an introduction using examples to explain elasticity. Students will then break into groups to discuss the teacher's explanations. The teacher will demonstrate elasticity using a rubber object, explaining how it changes shape under force. Students will make observations and answer questions to demonstrate their understanding of stress and how materials deform under force. They will also practice calculating stress, strain, and elasticity modulus to analyze elastic properties of materials.

1. LESSON PLAN
School : SMA Negeri XX Jakarta
Lesson : Fisika
Class : XI
Material : Elasticity
Time : 10 Minute
Semester/Education year : 1/ 2011-2012
Standard Competence : Analyze the natural phenomena and their arrangement within the scope of the object point mechanics.
Basic Competence : Analyze the influence of the force on material elasticity.
Basic Materials :
• The meaning of elasticity
• The meaning of elasticity properties of the object.
• The meaning of stress (σ), strain (ε), elasticity modulus (E)
Indicator : Students can:
 Explain the meaning of elasticity
 Determine the term of concept of the force by the elasticity properties of materials.
 Analyze the motion under the influence of spring force.
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2. Materials Description
Students Learning
Experiece
Learning strategy Competence Achieved Learning Place
Teacher Activity Students Aktivity
Elasticity is one of the
mechanical properties of
materials that can show
strength, endurance, and
stiffness of the material
against the external force
given to the material.
Stress is the ratio
Students are devide into
the grups and discuss the
explanation that
explained by the teacher.
Teacher do
apperception by
asking a few questions
(classical) such as
follow:
- Have you ever heard
the word of elastic?
What is it? How was
the elastic object is
given the external
force? Are there things
which not elastic?
Teacher showed the
demonstration using
the rubber and explain
the lesson material to
the students.
The question:
what is the difference
of this rubber after and
before given the
external force?
How the shape of the
object?
The teacher explain
the stress of elastic
material using the
rubber. And find that
Students answer
the quation that
given by the
teacher with the
owned concept of
the students.
Students give
attention to the
demonstration
showed by teacher.
Than try to
observe and able
to explain the
result of teacher
explanation.
The students do as
Students may mention
the meaning of
elasticity with the
initial concept owned.
Students more
understand the concept
of elasticity.
The students
Siswa dapat
menyebutkan
pengertian
elastisitas
dengan konsep
awal yang
dimiliki.
Siswa lebih
mengerti
konsep
elastisitas.
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3. Materials Description
Students Learning
Experiece
Learning strategy Competence Achieved Learning Place
Teacher Activity Students Aktivity
between force and
sectional area.
Strain is the ratio
between length changes
with the initial length.
.
The elasticity modulus is
the value of the ratio
between stress and strain
.
.
the stress equation is
.
Look at this rubber.
After given the
external force the
shape of the rubber is
changed and different
length from the initial
length.
This is the strain that
the change between
first length and the
length after given the
external force.
The teacher give
information that every
materials are have the
elasticity modulus
even very small and
different each
materials.
Teacher give the
quation test to the
students that simulate
understanding of
students.
teacher did in the
rubber, then
discuss about its
difference. So get
the new concept of
elasticity of
material.
Students pay
attention and see
the changes that
occurred in the
rubber and
measuring the
change in length of
the rubber. Then
get the the concept
of stress.
Students answer
the quation so they
get the concept of
strain.
understand the concept
of stress.
The students
understand the
meaning of strain.
The concept of
elasticity modulus
3

4. Materials Description
Students Learning
Experiece
Learning strategy Competence Achieved Learning Place
Teacher Activity Students Aktivity
4

5. On board
Elasticity is one of the
mechanical properties
of materials that can
show strength,
endurance, and
stiffness of the material
against the external
force given to the
material.
Stress is the ratio
between force and
sectional area.
Strain is the ratio
between length changes
with the initial length.
.
For the small stress, the
material is called
“elastic” and the value
of its strain is big. The
factor ratio between
stress and strain it’s
called The elasticity
(young) modulus.
.
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