![](http://static.xuejinqu.com/qimg/935/935ee29c2fd255e3e8399c6c28d871e4.png)
(1)定滑轮的作用是改变力的方向,但不能改变力的
(2)弹簧测力计的示数等于木块受到的滑动摩擦力大小的依据是:木块在水平方向上受到的力是一对
(3)如图乙,是在某次实验中弹簧测力计的读数示意图,由此可知,木块与木板间的滑动摩擦力的大小是
![](http://static.xuejinqu.com/qimg/095/0953341c5b7dd9341395c08e336fc8c4.png)
(4)多次改变砝码的质量,探究得出:接触面粗糙程度相同时,压力越大,木块与木板间的滑动摩擦力
![](http://static.xuejinqu.com/images/y-prise.png)
同类型试题
![](http://static.xuejinqu.com/images/medal.png)
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
![](http://static.xuejinqu.com/images/avatar.png)
![](http://static.xuejinqu.com/images/avatar.png)
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
![](http://static.xuejinqu.com/images/avatar.png)
![](http://static.xuejinqu.com/images/avatar.png)