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输入摩擦系数和正压力,快速计算滑动摩擦力大小。
For an object on a horizontal surface, N = m·g is used to calculate kinetic friction.
Common reference values: Steel-Steel 0.4-0.6; Wood-Wood 0.2-0.5; Rubber-Concrete 0.6-0.85; Ice-Ice 0.02-0.09.
Typically 9.8 m/s² on Earth's surface; 9.81 m/s² can be used for engineering estimates.
Formulas
Kinetic Friction: f = μ · N
Normal Force (Horizontal Surface): N = m · g
Normal Force (Inclined Plane): N = m · g · cos(θ)
Gravitational Component (Along Incline): F∥ = m · g · sin(θ)
This tool is based on classical mechanics, assuming the object is already sliding relative to the contact surface.
Negative net force along the incline means friction is greater than the gravitational component. The object will decelerate or remain stationary (further comparison with maximum static friction is needed).

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您在物理学习或力学设计中,是否常需手动计算滑动摩擦力?本工具基于经典滑动摩擦力公式 f = μ × N,您只需输入摩擦系数和正压力,即可立即获得准确的滑动摩擦力数值,免去手算错误和单位换算烦恼。
输入值时请确保摩擦系数和正压力均为纯数字,不要带单位字符。本工具假定正压力单位为牛顿 (N),计算结果直接以牛顿输出。若您的实际正压力使用千克力等单位,请先换算为牛顿(1 kgf ≈ 9.8 N)再输入。结果仅适用于滑动摩擦力场景,不涉及静摩擦力或滚动摩擦力。所有计算在浏览器本地完成,不会上传您的数据,请放心使用。若遇到输入非法字符,页面将提示错误,请修正后重试。
滑动摩擦力大小与接触面积无关,仅取决于摩擦系数和正压力,这是本计算器背后严格遵守的物理定律。典型算例:一个重量为50 N的箱子在木地板上水平拉动,若木与木的动摩擦系数为0.4,则滑动摩擦力 f = 0.4 × 50 = 20 N。在工程估算中,可利用此工具快速校核驱动力是否足够克服摩擦阻力。如果您需要对比不同材料的摩擦系数,建议参考权威摩擦手册选取合理 μ 值。