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一道大学自主招生试题原参考解答在计算功时并未明确指出所针对的参照系,但从功的计算结果来分析可知参照系有两种可能的情况:其一、f_1、f_2做的功均以传送带为参照系;其二、f_1做的功以传送带为参照系,f_2做的功以地面为参照系。然而,事实上在中学物理计算功时,当题目没有明确指定是针对何种参照系时一般就是默认以地面为参照系;而在运用动能定理、功能原理解题时必须是针对同一选定的惯性参照系来计算外力对各质点的功。
The original reference to a college entrance examination questions in the calculation of work did not clearly point out the reference frame, but from the calculation of the results to see the reference system there are two possible situations: First, f_1, f_2 do work The conveyor belt as the reference system; Second, f_1 to do the work of the conveyor belt as the reference system, f_2 to do the ground for the reference system. However, in fact, in the calculation of high school physics, when the title is not specifically designed for what frame of reference is generally the default to the ground as a frame of reference; in the use of kinetic theorems, functional principles to solve the problem must be for the same selected Inertial reference system to calculate the external force on each particle’s work.