如右图示的器材是:木质轨道(其倾斜部分倾角较大,水平部分足够

如右图示的器材是:木质轨道(其倾斜部分倾角较大,水平部分足够长)、小铁块、一根细线、一个量角器. 只用上述器材就可以测定小铁块和木质轨道间的动摩擦因数,实验步骤是:
a.将小铁块从倾斜轨道上的一固定位置由静止释放,让小铁块能下滑到水平轨道上
b.用图钉把细线钉在小铁块运动的起点、终点处并拉直
c.用量角器测量__________________________(先用文字说明再用字母表示),则小铁块与木质轨道间的动摩擦因数可表示为μ=__________.

答案

细线与水平轨道平面的夹角 θ ;tanθ

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