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在学到《运动和力》这一章时,老师给我们留下一个问题:如果不用里程表,如何简便地测出从你家到学校的路程?我想了好久,还是束手无策.因为从我家到学校的路程这么长,如果用皮卷尺逐段测量将非常麻烦.那天放学以后,我骑着自行车回家,在半途中,我忽然想到了一个方法:先测出自行车前轮的周长l,然后骑着自行车从家到学校,边骑车边数自行车前轮所转过的圈数n,则可得到路程s=nl.可是我发现骑车时车轮转动的圈数无法数清,而且很不安全.怎样才能解决这个问题呢?
When I learned about the chapter “Sports and Power,” the teacher left us with a question: How can we easily measure the distance from your home to school if you don’t use an odometer? I thought for a long time that I still couldn’t help. Because from my home The distance of the school is so long. If you use a tape measure to measure paragraph by paragraph, it will be very troublesome. After school that day, I rode my bicycle home. In the middle of the journey, I suddenly thought of a method: First, measure the perimeter of the front wheel of the bicycle. Then riding a bicycle from home to school, while riding a bicycle, count the number n of the bicycle’s front wheel, you can get the distance s=nl. But I found that the number of turns of the wheel when cycling is unclear, and it is very Insecure. How can we solve this problem?