Chap 6 Source of Energy

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CHAPTER 6: Source of energy


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Various forms and Sources of Energy

Lightenergy

Soundenergy

Nuclearenergy

Chemicalenergy

Potential

energy

Kineticenergy

Heatenergy

Electricalenergy


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1. Condition

2. Situation


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Akhir Tahun 2011


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Heat flow and its effectsShowing the effects of heat energy on solids, liquids and gases

1.Place the metal ball on the metal ring

Can the metal ball pass through the ring?

2.Heat the metal ball with a Bunsen Burner. Place the metal ball on the metal ringCan the metal ball pass through the ring?

3.Let the metal ball cool down to the room temperature. Place the metal ballon the metal ring again

Can the metal ball pass through the ring now?

4.What conclusioncan you make from your observation

A Solid


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B Liquids

1.Put the flat-bottomed flask into the hot water

What happen to the level of coloured water in the glass tube

2.Put the flat bottomed flask into the cold water

What happen to the level of coloured water in the glass tube

4.What conclusion can you make from your observation


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Heat flow

1.Heat can flow from one place to another. It can flow in three different ways

i. Conduction ii. Convection iii. Radiation

2.Conduction is the flow heat through solid

3.Convertion is the flow heat through liquids and gases4.Radiotion is the flow of heat through vacuum

7.5 Showing how heat flow in three different way

1. Prepare a 50 cm long iron rod, By using wax, stick five thumbtacks on the rodat 5 intervals

2. Clamp the iron rod to a retort stand

3.Heat the free end of the iron rod

i. What do you observe

ii. What is the function of the fireproof board

4. What conclusion can you make from your observation

A Conduction


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B Convectioni. Liquids

1.Tear a piece of paper into small piece

2.Put the small pieces into the water in a beaker

3.Heat the water in the beaker

What do you observe

4. What is your conclusion?

ii. Gases

1.Prepare the apparatus as shown

2. Light the candle and the rop

What do you observe

1.Prepare the apparatus as shown

3. What is your conclusion?

C Radiation

2.Place the thermometer about 10 cm from the bulb

5.Swith on the bulb

4.Observe the reading of thermometer

3.Swith on the vacuum pump

6. After 10 minute, observe the reading of thethermometer again

What do you observe

What your conclusion?


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Question

1.Compare the different between the initial temperature and final temperatureof water in each can. What do you observe.

2.Which material allows heat to pass through it easily?

3.Which materials does not allows heat to pass through it easily?

4. Which materials is a heat insulator?

6 . Is your smart guess true?

5. Which materials is not a heat insulator?

7.What is your conclusion?

8.

Thermometer

Hot waterMetal can

styrofoam Rubber bandAluminium


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CHANGE OF STATE - By heat energy

melting

Freezing

Sublimation

1.Crystal iodine, Dry ice and naphthalene

Condensation

1.Rain, clouds and Droplet at glass contains ice.

solidliquid

Gases

ABSORB / RELEASE HEAT ?


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Application of the Principle ofExpansionand Contraction of Matter

The principle of expansion and contraction is commonly applied in daily life

1.Mercury in thermometer

i. Mercury is a good heat conductor.

ii. It expand rapidly when it absorbs only a little heat

iii. When the temperature drops. The mercury contract and the levelof mercury in the glass tube drops

2. Bimetallic strip in a fire alarm

i. When there is a fire, the bimetallic is heated. As the brass bar expandsmore than the iron bar

ii. The bimetallic strip bends towards the contact screw. The circuit is complete

and the fire alarm will ring

2. Fire alarm


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Gap in railway track

Gap forexpand

roller

Fixed end

Gap

You can loosen the cap easily when you dip the cap of the bottle into hot water fora few minute

The gap is allow the track to expandduring very hot today

To allow for movement when a steel bridge expands or contract,one of its end is fixed while the other end is free to move over roller

4.

5.

3. in railway track


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energy in everyday life

converters Energy conversionMoving car Chemical energykinetic energy

Lighted candle Chemical energyheat energy + light energy

Alarm clock Potential energykinetic energysound energy

Electric kettle Electrical energyheat energy

Strecthed bow and

arrow

Potential energykinetic energysound energy

Solar cell Light energyelectrical energy

Bicycle dynamo Kinetic energyelectrical energylight energy + heat energy

Television Electrical energylight energy + sound energy

Hair dryer

Telephone

hydroelectric Potential energykinetic energyelectric energy


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Renewable and non-renewable energy

advantages disadvantages

renewable

Non renewable


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Penutup

2. Tasbih Kifarah.

1. Baca Surah Al-`Ashr

Documents

Chap 6 Source of Energy