资源描述：
《《物质结构元素周期律》测试题》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。
1、《物质结构元素周期律》测试题Specialtopicforwintervacation——balanceofforceandobjectKnowledgepoints:Theconceptof1.forcesandtheeffectofforce・2.theconceptofgravity,thedeterminationofthedirectionofforceandfriction,andthecalculationofitssize・3.bycapacityanalysisanduseofc
2、oncurrentforceequilibriumconditionstosolvepracticalproblems・Theflexibleapplicationofthesynthesisanddecompositionof4.forces・Thebalanceofanobjectundertheactionofgravity,elasticity,andfrictionThekeytothisproblemistoclarifythefollowingquestions:Gravityoft
3、envarieswithgeographicalposition.SometimesgravityisconsideredequaltogravityandissometimesconsideredunequaLAttentionshouldbepaidtotherelationshipbetweengravityandgravityattheequatorandthepoles,wherethecenterofgravityisrelatedtothemassdistributionandgeo
4、metryoftheobject・Two,elasticityoftheproductionconditions:1.contact1.deformationThedirectionofpressureandsupportisperpendiculartotheinterface,pointingtotheobjectbeingpressedorsupported.Ifthecontactsurfaceisspherical,thelineiselasticmusthavethecentre,ac
5、cordinglytoestablishtherelationshipbetweenwiththegivengeometricquantities・Thepullingforceoftheropemustbeequaltothetensionalongtheropeandthesamelightrope・"Slipringz，,〃hook〃，"pulley"doesnotcuttherope,thetensionaroundthesamesize,and"knot"isdividedintotwo
6、sectionsoftherope,tensionisoftenthesamesize・Theforceactingontherodmaynotbeanalyzedalongwiththeotherforcesandmotionstatesoftherod・Note:thepresenceorabsenceofelasticityisoftendeterminedbythe''hypothesismethod"combinedwiththestateofmotion.Inadditiontothe
7、Hookelawofelasticity,thecalculationofelasticforceisusuallysolvedbyNewton，sLaw(forceanalysiscombinedwiththestateofmotionandtheequationofstate)・2.,forfriction,wemustfirstmakesurethatthedynamicfrictionorstaticfrictionanditsdirection,anditsdirectionmustbe
8、oppositetotheoppositedirectionofmotionorrelativemotion.Buttheobjectcanbeinarbitraryanglewiththedirectionofmovement,suchastheobjectontheinclinedplaneismovedalongwiththeinclinedfaceinalldirections,andtheobjectplacedonthehorizontalturntablerotate
