1、指出一种物体的加速度和速度方向不一致的情况.（答：曲线运动）
2、当你跳跃时,为什么着地的时候最好屈膝?（用冲量来解释）
3、化合物SiCl4（一个硅原子被四个 氯原子包围）是一种无色液体,你认为下列哪种物质具有与之相似的化学性质?为什么?
A) SiBr₄(一个硅原子被四个溴原子包围);
(B) PCl₄(一个磷原子被四个 氯原子包围）
4、一个原子有17个中子、18个质子和18个电子,写出它的化学符号、质量数和电离态（例如 ⁴He2⁺）
1.Name one situation where the acceleration of an object is
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