Pupil teacher’s
Reg. no: 11303001 Class:
VIII
Subject: Physical
Science Duration:
25-30 Minutes
Topic: Types of force Date:
13/01/2014
SPECIFIC
OBJECTIVES:
1)
The students will be able to define force in their
own words.
2)
The students
will be able to explain the causes of tmovement of objects/bodies.
3)
The students will be able to enlist types of forces..
4)
The students
will be able to distinguish and differentiate various types of forces.
5)
The students
will be able to discover and explain muscular force, friction, magnetic force,
gravitational force and electrostatic force.
6)
The students
will be able to summarise various forces.
7)
The students will be able to associate various
forces in everyday life experiences.
SPECIFIC
AUDIO-VISUAL AIDS: Magnets, hanging container apparatus, ball,
plastics scale and accessories for performing relevant types of forces.
PREVIOUS
KNOWLEDGE ASSUMED:
It is assumed
that the students have learnt about movement of objects, basics about cause of these
movements, nature of different forces like gravity, magnetic force, etc.
INTRODUCTION:
PUPIL TEACHER’S ACTIVITY
|
PUPIL’S ACTIVITY
|
METHODS/TECHNIQUES/BOARD
WORKS/AV AIDS
|
Pupil teacher will say that earth revolves around
sun in the same manner other planets do just like entire universe moves
continuously. Even your systems in body are in continuous movement.
|
Pupils will listen carefully
|
Lecture method
|
Then, the pupil teacher will perform an activity
using hanging container (Pulling and pushing the hanged container to cause
movement) and asks ‘What caused the movement of the container?’
By pushing and pulling the hanged container, what
happened to its state of motion?
What do you call for push or pull exerted on the
objects?
What are types of forces you know?
|
May be force
Pushing and pulling the hanged container caused
the movement of it.
Force
No response
|
Hanging container(Concrete object)
Questioning
|
Students,
today we are going to study about types of forces.
|
ANNOUNCEMENT
OF TOPIC:
The pupil
teacher will say that today we are going to study about ‘Types of forces’ by
writing the topic on the board.
PRESENTATION:
TEACHING
POINT
|
PUPIL
TEACHER’S ACTIVITY
|
PUPIL’S
ACTIVITY
|
METHODS/TECHNIQUES/BOARD
WORKS/AV AIDS
|
EVALUATION
|
Definition
of force
|
Pupil teacher
will say that we already discussed that force is push or pull exerted on an
object.
|
Pupil will write
on their notebook.
|
Definition of
forece:
Force is push or
pull exerted on an object.
|
Define force in
your own words.
|
Types of
force
|
Pupil teacher
will ask students to enlist different types of forces.
Generally, force
can be categorised into two major types namely contact force and non-contact
force.
|
Pupil will say
gravity, magnetic force, frictional force, etc
|
Brain storming
|
Mention the two
general types of force.
|
Contact
force
|
Pupil teacher
will ask What you understand by the term contact.
Then, what do you
think the contact force is?
Yes, contact
force comes into play when two bodies are in contact. For example; muscular
force and friction
With an activity
on muscular force, pupil teacher will ask What your understanding of muscular
force is.
Muscular force is
resulted due to action of muscle. Example: lifting of book
Pupil teacher
will perform an activity on friction and ask how friction can be a contact
force?
Friction is an
opposing force which acts against the direction of moving object.
|
Pupils say
contact means in touch
Contact force is
force come into play when objects are in contact
Type of force
occurred due to muscle.
Because friction
occurs only when bodies are in contact with each other.
|
Contact force is
come into play only when two bodies are in contact. Muscular force and
friction are contact force.
Steel scale for
performing activity
Muscular force is
resulted due to action of muscle. For example: lifting of books
Frictional force
or friction is opposing force which acts against the direction of moving
object.
|
With a daily life
experience, explain contact force.
Describe types of
contact forces with an example each.
|
Non-contact
force
|
Pupil teacher
will perform an activity with magnets and prove that magnetic force is a type
of non-contact force i.e. without touching two magnets; they attract or repel
each other.
|
Pupils listen
carefully and note down in their note book
|
Non-contact force
occurs without touching two objects. Magnetic force, electrostatic and
gravity are non- contact forces
 |
What do you
understand by non-contact force?
|
By performing an
activity, pupil teacher will explain the electrostatic force.
|
Note down in
notebook
|
Plastic scale and
pieces of paper.
Force exerted by
a charged body on another charged or uncharged body is termed as
electrostatic force.
|
What is
electrostatic force?
|
|
By allowing a
ball to fall down by releasing from hand, gravity has to be explained.
|
Pupils will
observe carefully and note down.
|
Ball(Concrete
object)
Gravity is force
of attraction between all the masses in universe. Gravity of earth on an
object is earth’s gravity.
|
Define gravity in
your own words
|
RECAPITULATION: The pupil
teacher will say that today we have studied about Types of force. We have
learnt two general types of force and some sub-types of contact and non-contact
force.
Recapitulation
question;
1.
Define force.
2.
How force imparts movement to objects?
3.
Enlist types of force along with their sub-types and
one examples each.
4.
Distinguish contact force and non-contact force.
HOME
ASSIGNMENT:
Q 1. Suppose you
are appointed as a senior scientist for Indian space mission 2050. You are
asked to design a space transport system which can travel anywhere in the
universe with maximum speed by challenging friction, magnetic force,
electrostatic force and gravity that persist in the universe.
How will you
design that space transport system?
[Ask help from
your parents and study more on the types of forces.]
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