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一些物理试题中往往会出现“为使”、“欲使”、“为了达到”、“要想”、等等“目的”性词语,认真剖析这些词语,从中会找出一些解题过程中所需的辅助条件,有的甚至是解题的突破口和关键条件.例1一个质量为m,带电荷量为–q的小物体,可在倾角为θ的绝缘斜面上运动,斜面底端的高度为h,整个斜面置于匀强电场中,场强大小为E,方向水平向右,如图所示,小物体与斜面间的动摩擦因数为μ,为使小物体能从静止开始沿斜面下滑,θ、q、E、μ各量间必须满足怎样的关系?
Some physics questions often appear in “”, “want to ”, “in order to achieve ”, “want to ”, and so on “purpose ” sexual words, careful analysis of these words, From which will find some auxiliary conditions needed in the process of solving problems, and some even the problem-solving breakthroughs and key conditions.Example 1 A mass m, with a charge of-q small objects, can be tilted at θ Insulation bevel movement, the bottom of the bevel height h, the entire bevel placed in a uniform electric field, the size of the field strength E, the direction of horizontal right, as shown in the figure, small objects and the ramp dynamic friction coefficient μ, in order to make Small objects from the rest began along the ramp down, θ, q, E, μ the amount of the room must meet what kind of relationship?