例1 已知力F作的功是10焦,则力F与物体在力的方向上通过的距离s的图象大致是( )。 评析 这是一道与物理知识综合的函数应用题,解此题不仅要运用函数的有关知识,还要运用W=Fs这个物理公式。由题意,得F=10/s,即F与x成反比例。故选(B)。 例2 生物学指出,在生态系统中,每输入一个营养级的能量,大约只有10％的能量能够流 Example 1 Given that the work done by the force F is 10 joules, the image of the distance s between the force F and the object passing in the force direction is approximately ( ). This is a functional application problem that is integrated with physical knowledge. To solve this problem, not only the knowledge of the function but also the physical formula of W=Fs should be used. From the question, get F=10/s, that is, F is inversely proportional to x. So choose (B). Example 2 Biology points out that in the ecosystem, only about 10% of energy can be flowed for each trophic-level energy input