关于滚动物体所受静摩擦力的方向问题的教学  

On the Direction of Rolling Objects' Static Friction and its Question in Instruction

作　　者：王平瑞[1] 

机构地区：[1]贵州教育学院物理系,贵州贵阳55000

出　　处：《贵阳学院学报（自然科学版）》2007年第4期60-64,共5页Journal of Guiyang University：Natural Sciences

摘　　要：判断作纯滚动的刚体所受静摩擦力的方向,只要假设此刻刚体不受到静摩擦力的作用,那么刚体上的触点相对于接触面运动的加速度的反方向,即为静摩擦力的方向。对于刚体作"既滚且滑"的运动,此时触点与接触面之间的相对速度不为零,因此,刚体受到的是滑动摩擦力,我们只须考虑触点相对于接触面的速度,好可判断摩擦力的方向。Judging the direction of the static friction of rigid body in motion needs only the presupposition that the rigid is not influenced by the static friction, and then the reverse direction of the acceleration of the touch point on the rigid body opposite the contact surface is the direction of the static friction. When the rigid body is rolling and at the same time gliding, the relative velocity between the touch point and the contact surface is not zero, therefore the rigid accepts the gliding friction. We need only to consider the velocity of the touch point opposite to the contact surface and can judge the direction of the friction.

关 键 词：滚动 静摩擦力 方向 

分 类 号：G724.4[文化科学—成人教育学]