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分析:造成错解的原因是忽略了决定物体动能、重力势能大小的因素均分别有两个,误认为子弹和炮弹在同一高度,则重力势能相同,又速度相同,则动能相同,因此机械能也就相同。 正解 重力势能大小不仅与物体的高度有关,而且与物体质量有关,两弹高度相同,但炮弹质量大,故炮弹重力势能大,又动能与速度和质量有关,炮弹质量大动能也大,从而炮弹的机
Analysis: The cause of the misunderstanding is that the factors that determine the magnitude of the kinetic energy and the gravitational potential energy of the object are all two. It is mistaken for the bullet and the projectile to be at the same height. The gravitational potential energy is the same and the speed is the same, the kinetic energy is the same, so the mechanical energy is also It’s the same. The positive solution is not only related to the height of the object, but also to the quality of the object. The two bombs have the same height, but the quality of the projectile is large. Therefore, the gravitational potential energy of the projectile is large, and the kinetic energy is related to the speed and quality. The mass of the projectile mass is also large and the kinetic energy is large. Machine