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《 杠杆 》

《 杠杆 》. 162 中学 马丽莹老师 ”. 杠杆. 本课重点 认识杠杆的五要素 学会画力的力臂 理解杠杆的平衡条件. 认识杠杆. 在力的作用下能绕着固定点转动硬棒就是 杠杆. 杠杆的五要素. 动力 : 使杠杆转动的力叫做动力,(施力的点叫动力作用点) 阻力: 阻碍杠杆转动的力叫做阻力 ,( 施力的点叫阻力作用点 ) 支点: 杠杆绕着转动的点 动力臂: 从支点 O 到动力 F1 的作用线的垂直距离 L1 叫做动力臂 阻力臂: 从支点 O 到阻力 F2 的作用线的垂直距离 L2 叫做阻力臂. 杠杆的应用.

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《 杠杆 》

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  1. 《杠杆》 162 中学 马丽莹老师 ”

  2. 杠杆 本课重点 • 认识杠杆的五要素 • 学会画力的力臂 • 理解杠杆的平衡条件

  3. 认识杠杆 在力的作用下能绕着固定点转动硬棒就是杠杆

  4. 杠杆的五要素 • 动力:使杠杆转动的力叫做动力,(施力的点叫动力作用点) • 阻力:阻碍杠杆转动的力叫做阻力,(施力的点叫阻力作用点) • 支点:杠杆绕着转动的点 • 动力臂:从支点O到动力F1的作用线的垂直距离L1叫做动力臂 • 阻力臂:从支点O到阻力F2的作用线的垂直距离L2叫做阻力臂

  5. 杠杆的应用

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