谁告诉这些题怎么写那--(英文好的科学高手进)
1)whydoesanexperimentonlyeverhaveONEindependentvarible?
2)whatistherelationshipbetweenmassandinertiaofanobject?
3)whyfactorsdeterminetheamountofgravitationalforce?
4)frictiondependsonwhat2factors?
energy、joules、mechanicalenergy、potentialenergy、kineticenergy、lawofconservationofenergy、elasticpotentialenergy、gravitationalpotentialenergy、chemicalpotentialenergy、thermalenerty、nuclearenergy、electromagneticenergy、
energytransformation
选项..
1a)aballheldintheairhas_____becauseitisabovethefloorand____ispullingtheballdown.
1b)beforethegroundmovesduringanearthquake,thegeologicplatesthatmakeupthecrustaremovingunderthesurface.theybuilduptremendousstrain(_____)beforethatsuddenlybreaklooseandcausean____.
1c)batteriesareasourceofpotentialenergy.theyhave___.sodoesfood.
2a)the___oftheballisconvertedto___whentheballisdropped.
2b)the___ofthegeologioplatesisconvertedto___whentheplatesmoveandcausetheearthquake.
2c)the___inanbatteryisconvertedtolightenergywhenyouturnonaflashlight.
2d)whattypeofenergyisrequiredforplantstoperformpfotosynthesis?
2e)ifyouincreasethemassofamovingobject,whathappenstoitskineticenergy?