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用蜂窝煤灶鼓风机来演示一些物理实验,真是简单易行,广大农村中学物理教师不妨一试。一:用来演示增大摩擦力的方法。先将鼓风机皮带适当放长一点,用手握住手柄摇动鼓风机的 A 轮,可以看到皮带打滑,B 轮不动。这说明皮带与皮带轮(A、B)间摩擦力小了,然后将皮带缩短一点,套在皮带轮上,用手轻拉皮带发现皮带较紧,说明皮带对皮带轮的压力增大了,再转动手柄可以发现皮带不
It is simple and easy to use a honeycomb stove blower to demonstrate some physics experiments. The majority of rural middle school physics teachers may wish to try. One: to demonstrate the method of increasing friction. First put the blower belt to a suitable length and hold the handle to shake the A-wheel of the blower. You can see that the belt slips and the B-wheel does not move. This shows that the friction between the belt and the pulley (A, B) is small, then the belt is shortened a bit and put on the pulley. The belt is tightened by pulling the belt by hand, which indicates that the pressure of the belt on the pulley is increased, and then the handle can be rotated. Discovered the belt is not