Friction force can be measured using the equation F = μN, where F is the frictional force, μ is the coefficient of friction, and N is the normal force. If the coefficient of friction (μ) is not provided, it can be referenced from tables for common materials or determined through simple experiments. The discussion emphasizes the importance of context when measuring friction, as different materials will exhibit varying frictional properties. Understanding these properties is crucial for applications in physics and engineering. Accurate measurement and comparison of friction across materials can enhance material selection and performance in practical scenarios.