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【题目】下列关于“验证机械能守恒定律”实验的实验误差的说法,正确的是

A重物质量的称量不准会造成较大误差

B重物质量选用得大些,有利于减小误差

C重物质量选用得较小些,有利于减小误差

D打点计时器选用电磁打点计时器比电火花计时器误差要小

【答案】B

【解析】为减小实验误差,重物应选质量大些的,且重物质量不需称量,A、C错,B正确;电磁打点计时器的振针与纸带间有摩擦,电火花计时器对纸带的阻力较小,故选用电磁打点计时器误差大些,D错误

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