放在水平长木板上重10牛的木块,受到水平向右、大小为5牛的拉力作

放在水平长木板上重10牛的木块,受到水平向右、大小为5牛的拉力作用,沿水平方向做匀速直线运动,这时木块受到的合力为__  ___牛;当拉力增大到6牛时,木块受到的合力为__  _牛,方向是水平__   ___。

答案

01,向右;

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