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Lesson 1 : Fricon

[1] Complete:

1 Ifyourollamarbleontheearth,itdoesntkeependlessrollingduetotheeffectof................................force.

2 Frictionforce istheamountof.....................thatexistsbetween .........................andaffectsthemovementintheoppositedirection

3 Thedamagingofmachinesinternalpartisoneofthefriction..........................4Using ..................... and .................. decrease the friction force between the

internalsurfacesofthemachinesmovingparts.

5 Thefrictionforceisalwaysinthe...................directionobjectsmovement.

[2] Write the scientific terms:

1 A force that shows down the moving object and has effect in the oppositedirectionoftheobjectsmovements. (...........................)

2 Theyused todecrease theeffectof friction forcebetween the internalmovingpartsofmachine. (...........................)

3 Thesurfaceofthemachinesinternalmovingparts. (...........................)

[3] Tick ( ) in front of true sentence , and if the sentence is wrong correct the

underlined words.

1 Thefrictionsforceincreasestheobjectsmotion....................................................................................................................

2Oil isused todecrease theeffectof friction forcebetween the internalmovingpartsofmachines.

...................................................................................................................

3 Thefrictionforceisalwaysinthesamedirectionoftheobjectsmovement.

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...................................................................................................................

4 Thefrictionforcebetweentwosurfacesisgreaterwhilemovingthanstopping....................................................................................................................

5 Ball bearing are formed of a group of small metal balls which have smoothsurfaces

and

the

friction

force

between

them

is

non

existent

...................................................................................................................

[4] Give reasons:

1Usinglubricantsandoilinthemechanicalmachines?............................................................................................

2Usingballbearingsintheinternalpartsofthemachines?............................................................................................

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Unit 2 : The circulatory system and urinary system

Lesson 1 : The circulatory system and circulation

[1] Complete:

1The

circulatory

system

consists

of

..

,&.

2 Thebloodcarriesthe&toallthebodycells.3 Thereisa..betweeneachatrium&ventricle.4 Thebloodcomesoutoftheheartthrough.&returnbackto itthrough

.

5 Thebloodcomesbackfromthelungstotheheartthroughthe..6 Thebloodcomesoutofthehearttoallthepartsofthebodythrough..

[2]Give the scientific term:

1 Thesideoftheheartthatcontainsoxygenatedblood. (....)2 Bloodvesselscarrythebloodfromallpartsofthebodytotheheart.

(....)

3 Acomponentofthebloodthatformsthebloodclot. (....)

4 Thesystemwhichcarriesthedigestedfood&oxygentoallthebodycells.(....)

5 Theupperchambersoftheheart. (....)6 Thelowerchambersoftheheart. (....)

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[3]Give reasons for:

1 Thereisavalvebetweeneachatrium&ventricle....................................

...................................

2 Thecapillarieshaveverythinwalls....................................

...................................

3 Thebloodcontainsredbloodcells.

...................................

...................................

[4] Complete the table:

Point s of

comparisonsArteries Veins

1Transfertheblood2Thickness3examples

fromhearttobodycells

thick

.............

.....

......

..&.....

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[5] Label the following diagram:

1..2..3..

4..5..6..7..8..9..10..

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Lesson 2 : Excretion and human urinary system

[1] Complete:

1 Themostimportantorgansoftheurinarysystemare........................2Urinarysystemislocatedinsidethe..............................cavity.3 ....................... are two narrow tubes that carry urine from the kidneys to the

...........................

4 Twokidneyslocatedoneithersidesofthe............................5 Thebodygetsridofsweatthroughthe.............................

[2] Write the scientific term:

1 Twonarrowtubesthatcarryurinefromthekidneystotheurinarybladder.(.......................)

2 Asacthatreceivesurinefromtheureters. (.......................)3 Thefluidwhichthekidneysproducesandcontainsharmfulsubstances.

(.......................)

4 Theorganthatgetridexcesswaterandsaltsthroughsweating.(.......................)

[3] Put ( ) or ( ) and correct the underlined words:

1 Skinisoneofexcretoryorgans..........................................................................................

2Urinarysystemislocatedinsidethechestcavity..........................................................................................

3Urinarybladderisthemainorganoftheurinarysystem..........................................................................................

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4 Twolungsexcretecarbondioxideandexcesswaterintheformofvapor..........................................................................................

5 Sweathassaltytaste..........................................................................................

[4] Give reasons:

1 Skinisoneoftheexcretoryorgans?................................................................................................................

2 Sweathasasaltytaste?...............................................................................................................

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Unit 3 : The Soil

Lesson 1 : Soil components

[1] Complete:

1 Soilisathin............................layercoversthe........................2 Fromthesoilcomponents......................,.................and..................3 Thedecayedorganismsmixedinsoilcomponentisknownas......................4Waterand........................breakdownrocksintosmallpieces.5 Some spider and ........................ dig tunnels in the soil which allow

............................,......................andnutrientstopasseasilythroughthesoil.

[2] Write the scientific term:

1 Thedecoyedorganismsmixedinsoilcomponent. (.......................)2 AthinnoncompactedsuperficiallayerwhichcoverstheEarthscrust.

(.......................)

3Wormsdigtunnelsinthesoil. (.......................)

[3] Give reasons:

1 TheEarthwormsthatliveinthesoilhaveagreatimportance?............................................................................................................

2 Rootsareimportantforthesoil.............................................................................................................

[4] Choose :

1 TheoriginoftheagriculturalsoilinEgyptisfrom.....................

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a)Tibet b)Golan c)Ethiopia2 ....................istheremainsoffragmentedsmallrocksandwasdepositedonthe

earthssurface

a)Humans b)mud c)silt3 Fromthefactorsthatbreakdownrocksintosmallpieces....................a)leaves b)water c)deadorganisms