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ScienceUnitTest Name________________________________ Date_________________________________ Grade:8 Unit6:Gravity 1. Whichoftheseisbestusedtomeasureweightinnewtons? a. Springscale b. Triplebeambalance c. Doublepanbalance d. Simplelever 2. Whichofthesekeepsamooninorbitaroundaplanet? a. Shape b. Composition c. Size d. Gravity 3. Whichstatementclearlydescribesthemeasurementofanobjectinunitsofgramsandnewtons? a. Bothgramsandnewtonsaremeasuresoftheamountsofmatterthatmakeupanobject. b. Bothgramsandnewtonsaremeasuresoftheforcesofgravityactingonanobject. c. Gramsareameasureoftheamountofmatterthatmakeupanobject,andnewtonsarea measureoftheforceofgravityactingonanobject. d. Gramsareameasureoftheforceofgravityactingonanobject,andnewtonsareameasureof theamountofmatterthatmakeupanobject. Unit3Exam 1 4. WhichpropertyofanobjectwillbedifferentonthemoonthatitisonEarth? a. Chemicalstructure b. Mass c. pHlevel d. Weight 5. Whichoftheseisdirectlyaffectedbygravity? a. TherotationofEarthonitsaxis b. TheorbitofthemoonaroundEarth c. ThemagneticfieldsurroundingEarth d. TheproductionofoxygeninEarth’satmosphere. 6. Whenwillthegravitationalattractionbegreatestbetweentwobaseballs,eachwiththesamemass? a. Whentheyare10metersapart b. Whentheyare1meterapart c. Whentheyare5metersapart d. Whentheyare20metersapart 7. An8kgobjectwasplacedonascaleandweighed10newtons.GravityonEarthis9.81m/s2andthe airpressurewas1atm.Whichofthefollowingisthemassoftheobject? a. 10newtons b. 8kilograms c. 9.81m/s2 d. 1atm 8. Whatwouldhappentoallplanetsinthesolarsystemifgravitydidnotexist? a. Theplanetswouldallcrashintoeachother. b. Theplanetswouldallcrashintothesun. c. Theplanetswouldallflyawayfromthesun. d. Theplanetswouldcontinuetoorbitthesun. Unit3Exam 2 9. WhichoftheseaffectsthestrengthofthegravitationalforcebetweenEarthandthesun? a. ThetiltoftheaxisofEarth b. ThedistancebetweenEarthandthesun c. TheamountofenergyEarthreceivesfromthesun d. ThemovementofmoltenmetalsinthecoreofEarth 10. AstudentdrewadiagramofEarthatfourdifferentpointsinitsorbitaroundthesun.Thestudent drewarrowstorepresentthedirectionofthegravitationalforceofthesunonEarth. Whicharrowdidthestudentdrawincorrectly? a. 1 b. 2 c. 3 d. 4 Unit3Exam 3 11. Inwhichofthesesituationswillanobjectbecomelessmassive? a. Matterisremovedfromtheobject. b. Heatchangesthephysicalstateoftheobject. c. TheobjectisweighedonthemooninsteadofonEarth. d. Theobjectismeasuredonascaleinsteadofabalance. 12. Thesunismuchlargerthanthemoon.Whichofthesebestexplainswhythemoon,despiteits smallersize,hasagreatereffectonoceantidesthanthesundoes? a. Themoonhasalowersurfacetemperature. b. Themoonproduceslesslightthanthesun. c. ThemoonandEarthhavethesamecomposition. d. ThemoonismuchclosertoEarth. 13. Abowlingballweighs12newtons.Whichofthefollowingwouldbebestusedtomeasurethemass ingramsofthebowlingball? a. Springscale b. Triplebeambalance c. Doublepanbalance d. Simplelever 14. IfEarthandJupiterwerethesamedistanceawayfromthesun,whichplanetwouldhavea gravitationalattractiontothesunandwhy? a. Jupiterwouldhaveagreatergravitationalattractiontothesun,becauseJupiterismore massivethanEarth. b. Jupiterwouldhaveagreatergravitationalattractiontothesun,becauseJupiterhasalarger volumethanEarth. c. Earthwouldhaveagreatergravitationalattractiontothesun,becauseEarthhasagreater densitythanJupiter. d. Earthwouldhaveagreatergravitationalattractiontothesun,becauseEarthhasahigher averagetemperaturethanJupiter. Unit3Exam 4 15. Whichofthefollowingbestexplainshowobjectsinthesolarsystemaffecteachother? a. Thesunistheonlyobjectthathaveagravitationalpullontheotherobjectsinthesolar b. Theobjectsinthesolarsystemdonothaveanaffectoneachother. c. Allobjectsinthesolarsystempusheachotherapart. d. Allobjectsinthesolarsystemhaveagravitationalpulloneveryotherobjectinthesolar systems. Unit3Exam 5