(物理学习方法)公式学习法

公式学习法 【释义】物理公式(含物理定律的数学表达式)是物理学成熟的重要标志,从定性到定量的研究,使物理现象从经验升华到科学。物理公式一般可分为三类: 1.定义式 它是对一类问题的…

公式学习法

【释义】物理公式(含物理定律的数学表达式)是物理学成熟的重要标志,从定性到定量的研究,使物理现象从经验升华到科学。物理公式一般可分为三类:

1.定义式

它是对一类问题的概括性表达式,表示某一物理概念的意义。使用这类公式,不能简单地从数学角度看,而应透过数学表达式这个现象,去领会它的物理实质。如:密度绝不能认为密度与质量M成正比,与体积V成反比,密度是物质自身的特性,由物质的种类决定,与物体的质量和体积无关。同理,电阻的定义R=U/I也是如此,电阻R由组成电阻的材料、长度、横截面积来决定。

2.物理定律、规律、原理表达式

它揭示了这一类物理现象在运动变化过程中所遵循的法则。使用时,要特别注意这类表达式的适用范围和条件。

例如:液体压强公式,它表达了液体在内部各处产生的压强所遵循的规律,它的适用范围是:静止液体,应特别注意的是,h是从液体上表面往下测量的深度,而不是通常意义上所说的高度。

3.计算式

它是对某一物理过程或物理规律进行合理推论、扩展以后得到的计算某一物理量的最简式,一般地,计算式适用范围比相应的物理定律、规律和原理表达式的范围更窄。如公式,它适用于计算匀速直线运动中的距离等。

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