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在摩擦力大小的计算中,首先要分清楚是静摩擦力,还是滑动摩擦力,再根据具体情况进行计算.例(高一物理课本第11页练习)重量为100N的木箱放在水平地板上,至少要用40N的水平推力,才能使它从原地开始运动.地面与木箱间的最大静摩擦力Fmax=_____.木箱从原地移动以后,用38N的水平推力,就可以使木箱继续做匀速运动.这时木箱所受的滑动摩擦力F=
In the calculation of the friction force, it is first necessary to distinguish clearly whether it is the static friction force or the sliding friction force, and then calculate according to the specific situation. Example (11th page of the physical education textbook exercise) The weight of 100N wooden box on the level of the floor At least 40N horizontal thrust must be used to make it move from its original position. The maximum static friction force between the ground and the wooden box is Fmax=_____. After the wooden box is moved from its place, the horizontal thrust of 38N can be used to make the wooden box. Continue to do uniform movement. At this time, the wooden box is subjected to sliding friction F=