在处理物理问题时,常常借助熟知的模型,如,质点模型、子弹打木块模型、人船模型、等时圆模型……这样可以把复杂情景简明化,抽象问题具体化,疑难问题清晰化,下面着重来研究一下“等时圆”模型及形异质同的“等时圆”问题。 In dealing with physical problems, often using well-known models, such as the particle model, the bullet-playing block model, the ship model, isochronous model ... ... This can simplify the complex scenarios, the abstract of the specific issues, difficult issues clear The following focuses on the “Isochronous circle ” model and shape heterogeneous “isochronous circle ” problem.