energy and work-oke

8/7/2019 ENERGY AND WORK-OKE

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ENERGY AND WORKENERGY AND WORK

PLEASE DIVIDED THEPLEASE DIVIDED THECLASS INTO 4 GROUPS!CLASS INTO 4 GROUPS!DO THE QUIZ IN ADO THE QUIZ IN A

GROUPGROUPONE GROUP 1 SHEETONE GROUP 1 SHEET

ENERGY AND WORKENERGY AND WORK

PLEASE DIVIDED THEPLEASE DIVIDED THECLASS INTO 4 GROUPS!CLASS INTO 4 GROUPS!DO THE QUIZ IN ADO THE QUIZ IN A

GROUPGROUPONE GROUP 1 SHEETONE GROUP 1 SHEET


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Quiz

A

A and B have the different mass. But thesame velocity and the same distance, whichof the object that has the bigger energy?

Why? Explain your predict!


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A (red)and B ( green) have the same mass and

distance, but the different velocity, which ofthe object that has the bigger energy?

Why? Explain your predict!


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B

A

Aand

Bhave the same mass and

velocity but the different distance,which of the object that has thebigger energy?Why? Explain your predict!


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A ( the rainbow ball) and B( the red one), which ofthe object that has thebigger energy?Why? Explain yourpredict!


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BASIC COMPETENCE The Students can explain the relation

of the forms of energy and its

transformation, the principle ofenergy and the application of theconcept of work and energy in daily

life.


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OBJECTIVESStudents are able to :

explain the meaning of energy.

mention the kinds of energy investigate that energy is conserved

when changing from one form to

another


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SCIENCE WORD ENERGY

KINETIC ENERGY

POTENTIAL ENERGY TRANSFORMATION ENERGY


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Before going to school, why you haveto eat ?

We need energy to do activities


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What is energy?What is energy?

The ability to do work or to produce a change Can you think of examples in which energy isneeded in our daily life?


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1. How does our body get energy?From food.

2. From where do cars get their energy to move?

From fuels, e.g. petrol, diesel.


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What kinds of the energy do youknow?


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Forms of

Energy

Forms of energyForms of energy There are many forms of energy These forms of energy can be classified into 3

groups:

Potential (stored

energy)Kinetic Energy Others


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Potential energy

Potential energy

Can you describe, in your own words, what you think

the different forms of potential energy are from the

pictures below?

Forms of

Potential Energy

Gravitational

potential

Elastic

Potential Chemical Electrical


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Potential energyPotential energy

Potential energy is the energy stored in objectsCan you describe, in your own words, what you think

the different forms of potential energy are from the

pictures below?

Forms of

Potential Energy

Gravitational

potential

Elastic

Potential Chemical Electrical

Energy stored when

an object is lifted

above the surface

of the Earth.

The higher the object,

the greater its

gravitational potential energy

Energy stored whenobjects are stretched,

compressed or bent

Energy stored in

substances, suchas, food and fuels

Energy that

makesmachines work


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Kinetic energyKinetic energy

Kinetic energy is the energy a moving object hasbecause of its motion

The faster an object moves, the more kineticenergy it has.

.


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Other forms of

Energy

Heat Light Sound Nuclear

Energy givenout

by hot objects

Energy which

enables

us to see things

Energy wecan hear

Energy stored inthe nuclei of

atoms

Others form of energyOthers form of energy

Can you think of examples of objects that give out these forms of

energy?


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Object Starting form of

energyFinal form

of energy

Electric

toaster

Electrical Heat

Roller coaster at the

highest part of the

track

Gravitational potential

Kinetic

MRT train Electrical Kinetic

Energy changes from one form to anotherEnergy changes from one form to another

Write 3 examples beside the figure below!Write 3 examples beside the figure below!


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When a force is done on somethingin the same direction of itsmovement, the work can bemeasured with the equation:

work = force x displacement

W = F x dW = Work ( Joule)

F = Force ( Newton)

d = displacement ( meter)


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Power is the work given in each time unit.

tP = w

P = Power ( Watt )W = Work ( Joule)

t = time ( second)


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The Potensial energy

Ep = m.g.h

The Kinetic Energy Ek = mv2

Ep = Potensial Energy ( Joule)

Ek = Kinetic Energy ( Joule)

m = mass ( kg)

v= velocity ( m/s)


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THANKS FOR YOUR

ATTENTION

SEE YOU NEXT TIME

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