動滑輪注意.

    動滑輪注意

    動滑輪省1/2力多費1倍bei距ju離li，而er且qie僅jin限xian於yu豎shu直zhi向xiang上shang用yong力li時shi，用yong力li傾qing斜xie的de角jiao度du越yue大da，用yong的de力li越yue多duo。而er且qie使shi用yong動dong滑hua輪lun時shi滑hua輪lun的de重zhong量liang對dui用yong的de力li也ye有you影ying響xiang。不bu忽hu略lve滑hua輪lun重zhong力li且qie豎shu直zhi向xiang上shang用yong力li時shi，我wo們men有you：F=（G輪+G物）/2