用一组动滑轮啦物体A以0.5m/s的速度在水平面上匀速拉动,物体A重为为20N,受到的摩擦力是物重的0.2倍.若忽略绳子与滑轮间的摩擦,则在2s内绳端杯拉长了多少米?拉力F=2N.
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![用一组动滑轮啦物体A以0.5m/s的速度在水平面上匀速拉动,物体A重为为20N,受到的摩擦力是物重的0.2倍.若忽略绳子与滑轮间的摩擦,则在2s内绳端杯拉长了多少米?拉力F=2N.](/uploads/image/z/13106950-70-0.jpg?t=%E7%94%A8%E4%B8%80%E7%BB%84%E5%8A%A8%E6%BB%91%E8%BD%AE%E5%95%A6%E7%89%A9%E4%BD%93A%E4%BB%A50.5m%2Fs%E7%9A%84%E9%80%9F%E5%BA%A6%E5%9C%A8%E6%B0%B4%E5%B9%B3%E9%9D%A2%E4%B8%8A%E5%8C%80%E9%80%9F%E6%8B%89%E5%8A%A8%2C%E7%89%A9%E4%BD%93A%E9%87%8D%E4%B8%BA%E4%B8%BA20N%2C%E5%8F%97%E5%88%B0%E7%9A%84%E6%91%A9%E6%93%A6%E5%8A%9B%E6%98%AF%E7%89%A9%E9%87%8D%E7%9A%840.2%E5%80%8D.%E8%8B%A5%E5%BF%BD%E7%95%A5%E7%BB%B3%E5%AD%90%E4%B8%8E%E6%BB%91%E8%BD%AE%E9%97%B4%E7%9A%84%E6%91%A9%E6%93%A6%2C%E5%88%99%E5%9C%A82s%E5%86%85%E7%BB%B3%E7%AB%AF%E6%9D%AF%E6%8B%89%E9%95%BF%E4%BA%86%E5%A4%9A%E5%B0%91%E7%B1%B3%3F%E6%8B%89%E5%8A%9BF%3D2N.)
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用一组动滑轮啦物体A以0.5m/s的速度在水平面上匀速拉动,物体A重为为20N,受到的摩擦力是物重的0.2倍.若忽略绳子与滑轮间的摩擦,则在2s内绳端杯拉长了多少米?拉力F=2N.
用一组动滑轮啦物体A以0.5m/s的速度在水平面上匀速拉动,物体A重为为20N,受到的摩擦力是物重的0.2倍.若忽略绳子与滑轮间的摩擦,则在2s内绳端杯拉长了多少米?拉力F=2N.
用一组动滑轮啦物体A以0.5m/s的速度在水平面上匀速拉动,物体A重为为20N,受到的摩擦力是物重的0.2倍.若忽略绳子与滑轮间的摩擦,则在2s内绳端杯拉长了多少米?拉力F=2N.
F摩擦力=0.2*G=4N
S伸长=l物*(F摩擦力/F拉力)=2m