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一、知识要点:1.浮力产生的原因:液体或气体对浸入在其中的物体有竖直向上的托力,叫做浮力。浮力的施力物体是液体或气体。浮力是由于液体对物体向上和向下的压力差产生的。但是并不是所有浸入液体的物体都受浮力的作用,如水中的桥墩,由于其底部深深的陷入河底中,不受液体向上的压力,也就不受浮力的作用。
First, the main points of knowledge: 1. Cause of buoyancy: liquid or gas on the object immersed in the vertical upward force, called buoyancy. The buoyant force object is liquid or gas. Buoyancy is due to liquid pressure on the object up and down. However, not all objects immersed in liquid are subject to buoyancy, such as piers in water, which are not subject to buoyancy forces due to their bottom being deeply trapped in the bottom of the river without upward pressure on the liquid.