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在某刊物“一题一议”栏目中“加速度分解的陷阱”一文中将加速度的分解与速度分解相类比,得出重物的加速度 a_物=acosθ的结果,并提出这个结果是否有问题的疑问.笔者认为这样解答加速度是错误的,本文就这样求解加速度存在的问题做一分析讨论.原题如图1(a)所示,一玩具汽车静止开始从 A 点向左作加速度为 a 的匀加速直线运动,到 B 点时速度为 v,此时 BC 绳子与水平方向上的夹角为θ,已知重物的质量为 m,BC
In the article “A subject” item “Acceleration decomposition trap” article, the acceleration decomposition is compared with the velocity decomposition, and the result of the acceleration a_object=acosθ of the weight is obtained, and this is proposed. Whether the result has questionable questions. The author thinks that answering the acceleration is wrong. This article will analyze and discuss the problem of solving the acceleration problem. The original question is shown in Figure 1(a). A toy car is stationary and starts from point A to the left. For a uniform acceleration linear motion with acceleration a, the velocity is v at point B. At this time, the angle between the BC rope and the horizontal direction is θ, and the weight of the known weight is m, BC