一幅常见的子弹打木块插图的错误

• 作 者: 李环生
• 机 构: 江苏省姜堰中学 225500
• 出 处: 物理通报
• 发表日期: 1996年11期
• 关键词: 高中物理 大学物理 合外力 初速度 动能定理 证法 中都 于娜 三式 相对静止

许多大学物理和高中物理书刊中都有子弹打木块的问题: 质量为M的木块静止在光滑的水平面上,一粒质量为m的子弹以初速度v_0水平打入木块但未打穿。设子弹在打入木块后相对木块运动的过程中受到的阻力恒定,从子弹打入木块到子弹刚好相对木块静止,木块前进的距离为s_木,子弹打入木块的深度为d,求:……(具体问题从略)。

Many college physics and high school physics books have problems with bullets hitting blocks: Blocks of mass M stand still on a smooth level, and a bullet of mass m hits the block at the initial speed v 0 but does not break through. . Let the bullets receive a constant resistance during the movement of the bullets against the wooden blocks after they hit the wooden block. From the bullets to the wooden blocks, the bullets just stand still with respect to the wooden blocks. The wooden blocks travel a distance of s_wood and the bullets hit the wooden blocks. The depth is d, find: ... (the specific problem is omitted).