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力是物体间的相互作用。各种力有两种不同的分类方法:按性质不同可分为重力、弹力、摩擦力、分子力和电磁力;按效果不同可分为压力、拉力、浮力、动力和阻力等。现代科学研究告诉我们,通常见到的重力、弹力、摩擦力、分子力和电磁力可以归结为两种基本的相互作用,即万有引力和电磁力。万有引力是由于物体具有质量而在物体之间产生
Force is the interaction between objects. There are two different kinds of force classification methods: According to the nature can be divided into gravity, elastic force, friction force, molecular force and electromagnetic force; according to different effects can be divided into pressure, tension, buoyancy, power and resistance. Modern scientific research tells us that gravity, elastic force, friction force, molecular force, and electromagnetic force that are commonly seen can be attributed to two basic interactions, namely, gravitation and electromagnetic force. Gravitation is due to the mass of an object and its creation between objects.