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1对测力计读数的影响测力计的读数,就是测力计受到的力。如图1所示:静止时,由二力平衡:F=G由牛顿第三定律:F=F′所以,读数F′=G。即视重等于物体的重力,可以用测力计准确测出物体的重力。失重时(以加速度a加速下降),由牛顿第二定律:mg-F=ma故F=m(g-a),F′G,读数少于实际重力同
1 Effect on the dynamometer reading The dynamometer reading is the force on the dynamometer. As shown in Fig. 1 : At rest, it is balanced by two forces: F=G by Newton’s third law: F=F’ So, the reading F’=G. That is, the apparent weight is equal to the weight of the object. You can use the dynamometer to accurately measure the weight of the object. When weightlessness (acceleration and acceleration with acceleration a), by Newton’s second law: mg-F = ma, so F = m (g-a), F’G, the reading is less than the actual gravity with