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ScienceUnitTest
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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.
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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.
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9. WhichoftheseaffectsthestrengthofthegravitationalforcebetweenEarthandthesun?
a. ThetiltoftheaxisofEarth
b. ThedistancebetweenEarthandthesun
c. TheamountofenergyEarthreceivesfromthesun
d. ThemovementofmoltenmetalsinthecoreofEarth
10. AstudentdrewadiagramofEarthatfourdifferentpointsinitsorbitaroundthesun.Thestudent
drewarrowstorepresentthedirectionofthegravitationalforceofthesunonEarth.
Whicharrowdidthestudentdrawincorrectly?
a. 1
b. 2
c. 3
d. 4
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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.
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15. Whichofthefollowingbestexplainshowobjectsinthesolarsystemaffecteachother?
a. Thesunistheonlyobjectthathaveagravitationalpullontheotherobjectsinthesolar
b. Theobjectsinthesolarsystemdonothaveanaffectoneachother.
c. Allobjectsinthesolarsystempusheachotherapart.
d. Allobjectsinthesolarsystemhaveagravitationalpulloneveryotherobjectinthesolar
systems.
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