“在泥泞的道路上,挑适量的担子不易滑倒,这是为什么呢?”刚读完这个问题,同学们或许心生疑问.“挑担子行走”不是更沉重,更艰难吗? 仔细想想就会发现,“在泥泞的道路上”有着特定的含义. 讨论“滑倒”,一般从滑动摩擦力的大小去考虑.滑倒是由于脚与地面间的摩擦力小;而不滑倒是由于脚与地面间的摩擦力大.滑动摩擦力的大小跟接触面的粗糙程度和压力的大小有关.对于本 “On the muddy road, picking up the right amount of burdens is not easy to slip. Why is this?” Just after reading this question, the students may be skeptical. “Is it more difficult and more difficult to take the burden?” Think carefully. It will be found that “in the muddy road” has a specific meaning. Discussion “slip” is generally considered from the size of the sliding friction. Slip is due to the small friction between the foot and the ground; not slipping is due to the foot The friction between the ground and the ground is large. The size of the sliding friction is related to the roughness of the contact surface and the size of the pressure.