初中科学临测：简单机械（滑轮）
Quiz by CHEW HOCK LEONG周福隆
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- Q 1/4Score 0如图所示的滑轮组，当负载为3000 N时，施力F至少应为多少N，才能将负载升起？29150075010003000
4 questions
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- Q1如图所示的滑轮组，当负载为3000 N时，施力F至少应为多少N，才能将负载升起？15007501000300060s
- Q2在图中，若绳子受力F之作用而下拉50cm，则重物W将被升高多少？25 cm6.5 cm12.5 cm10 cm60s
- Q3某工人使用如图所示的滑轮组将240 N的重物拉上高处。他最少须用多少的拉力？120 N80 N60 N240 N60s
- Q4不考虑摩擦和滑轮的重力，当下图中滑轮组保持平衡时，F的大小应为多少？200 N300 N50 N100 N60s
