機械效益
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機械效益(mechanical advantage,簡稱「MA」)係機械工程學上嘅一個概念:一架機械會受到一股力,並且向一個負荷力作功,如果忽略摩擦力所引致嘅作功流失,「作用力施嘅作功」會等如「負荷力受嘅作功」,但係喺現實世界,前者基本上實會細過後者,而作用力同負荷力之間嘅比例就係所謂嘅,即係話:
- ,當中 係負荷力所受嘅力,而 係施嘅力。
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