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Force, Work and Energy
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FORCE, WORK AND ENERGY
FORCE
A push or a pull applied on an object.
USES OF FORCE
FORCE
1. Move a body
2. Stop a moving body
3. Change the direction of the moving body.
4. Change the shape of an object.
TYPES OF FORCES
Contact force
Non contact force
TYPES OF FORCES
https://www.youtube.com/watch?v=nk35aGqJ-F8
https://www.youtube.com/watch?v=SybIX2nEn1E&list=PLmdFyQYShrjcoTLhPodQGjtZKPKIWc3Vp
IDENTIFY THE TYPES OF FORCES IN THE FOLLOWING IMAGES.
ACTIVITY
C
A
E
D
B
MUSCULAR FORCE
THE FORCE EXERTED BY THE ACTION OF MUSCLES.
Title
ELASTIC FORCE
Title
THE ABILITY OF A MATERIAL TO RETURN TO ITS ORIGINAL SHAPE, AFTER BEING STRETCHED OR COMPRESSED IS CALLED ELASTICITY.
WHEN AN ELASTIC MATERIAL IS STRETCHED OR COMPRESSED IT EXERTS ELASTIC FORCE.
GRAVITATIONAL FORCE
Title
THE EARTH PULLS ALL THE OBJECTS TOWARDS ITSELF WITH A FORCE KNOWN AS GRAVITATIONAL FORCE.
FRICTIONAL FORCE
Title
THE FORCE THAT CAUSES MOVING THINGS TO SLOW DOWN OR STOP IS CALLED AS FRICTIONAL FORCE.
ADVANTAGES
Title
- HELPS US TO WALK
- HELP US TO HOLD THINGS
- HELP US TO WRITE
DISADVANTAGES
Title
- WEAR OUT MACHINE PARTS
- MAKES DIFFICULT TO MOVE HEAVY THINGS.
ELECTROSTATIC FORCE
Title
The electrostatic force is an attractive and repulsive force between particles are caused due to their electric charges.
MAGNETIC FORCE
Title
THE FORCE EXERTED BY MAGNET IS CALLED AS MAGNETIC FORCE.
WORK
When we use force on a body to make it move through a distance.
WORK
FORMULA TO CALCULATE WORK DONE
Work done= Force applied on an object X Distance moved by an object.
A box moves 5m on applying a force of 15 N. How much work is done?
Question
F= 15N
5m
MACHINES
A tool that makes work easy.
SIMPLE MACHINES
SIMPLE MACHINES
TYPES OF SIMPLE MACHINES
https://www.youtube.com/watch?v=ByLXZCP4ixc
IDENTIFY SIMPLE MACHINE IN THE FOLLOWING OBJECTS.
ACTIVITY
A
C
E
B
D
ENERGY
The capacity for doing work.
ENERGY
https://www.youtube.com/watch?v=Q0LBegPWzrg
SOURCES OF ENERGY
1. Sun
2. Atom
3. Hot interior of the earth
SOURCES
TYPES OF ENERGY
TYPES
https://www.youtube.com/watch?v=ZsXQ9ijV54w
SOLAR ENERGY
The energy we get from the sun is called solar energy.
This solar energy can be changed into heat energy, light energy and electrical energy.
ATOMIC ENERGY
Atomic energy comes from the splitting of an atom.
Atomic energy should be used for mankind
ATOMIC ENERGY
GEOTHERMAL ENERGY
The hot interior of the earth is another source of energy. This energy is called geothermal energy.
GEOTHERMAL ENERGY
WIND AND WATER ENERGY
This energy is mainly used to generate electricity.