人教版初中物理第一册第142页小实验“筷子提米”:在玻璃杯里装上大半杯大米,把一根筷子插在中间,将米压紧,使筷子直立,再继续往里加少许水,等一会儿,拿起筷子就可以把装米的玻璃杯提起来。在实践教学中,要掌握好要点:①水要适量;②米粒膨胀时间。如果不成功,重做又较费时;若任 PEP Junior High School Physics Volume 1 Page 142 Small experiment “Chopsticks and Timmy”: Put a half cup of rice in a glass, insert a chopstick in the middle, press the rice tightly, and hold the chopsticks upright, then continue to Riga. A little water, wait a moment, pick up the chopsticks and lift the glass of rice. In practice teaching, we must grasp the main points: 1 water to be appropriate; 2 grain expansion time. If it is not successful, redoing is more time-consuming;