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一、全反力和摩擦角的含义如图1,质量为m的物体放置在摩擦因数为μ的水平地面上,受到动力F作用而处于静止状态,物体从而受到4个共点力。如图2,我们把摩擦力f和地面的支持力F_N的合力R称作全反力,其方向与法向成φ角,当推力F变大时摩擦力f也随之变大,于是全反力R与法向之间的夹角φ也相应地变大,当推力F增大到使物体即将滑动又未动的临界状态时,对应的摩擦力也达到
First, the full meaning of the reaction and friction angle Figure 1, mass m of the object placed on the level of the friction factor of the ground on the ground, under the action of the force F is in a static state, the object is thus subject to 4 points of force. As shown in Figure 2, we call the resultant force R of the friction force f and the support force F_N of the ground as the full reaction force, and the direction and the normal direction are φ angles. When the thrust force F becomes large, the friction force f also becomes larger, so the whole The angle φ between the reaction force R and the normal increases accordingly. When the thrust F increases to a critical state where the object is about to slide and is not moving, the corresponding friction force is also reached.