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同学们在初学物理时 ,比较普遍出现的问题———单位换算不过关。很多同学对数字后面带有单位 ,并让这些单位参与运算感到不适应 ,常出现单位换算过程中书写错误。比如 :例 1 78千米 =78千米× 1 0 0 0米 =780 0 0米。例 2 50毫米 =50毫米÷ 1 0厘米 =5厘米 ; 50毫米 =
Students in the novice physics, more common problems - unit conversion, but off. Many students feel uncomfortable with the numbers behind the numbers and let these units participate in the calculations. Often mistakes are made in the process of unit conversion. For example: Example 1 78 km = 78 km × 1 0 0 m = 780 0 0 meters. Example 2 50 mm = 50 mm ÷ 1 0 cm = 5 cm; 50 mm =