Not surprising. You have no safety mat or adhesive stickers to allow for purchase on surface with a low coefficientofstaticfriction.
你既没有防滑护垫也没有不干胶贴纸导致浴缸表层静摩擦系数低，因此摔倒也不足为奇。
2
We will do that later until it starts to slip and then at that critical angle that it starts to slip you have a value for mu of s for the staticfrictioncoefficient.
增加倾斜度直到物体开始下滑,然后记住开始下滑时的角度值,通过公式就能求出,静摩擦系数μ静。
3
The coefficientoffriction for static contact is higher than for dynamic contact, so static contact provides better traction.