Inertial reference frames A Reference Frame is the place you measure from It's where you nail down your (x,y, z) axes An Inertial Reference Frame(IRF)is one that is not accelerating We will consider only IRF's in this course Valid IRF's can have fixed velocities with respect to each other More about this later when we discuss forces For now, just remember that we can make measurements from different vantage points Physics 121: Lecture 7, Pg 6Physics 121: Lecture 7, Pg 6 Inertial Reference Frames: A Reference Frame is the place you measure from. It’s where you nail down your (x,y,z) axes! An Inertial Reference Frame (IRF) is one that is not accelerating. We will consider only IRF’s in this course. Valid IRF’s can have fixed velocities with respect to each other. More about this later when we discuss forces. For now, just remember that we can make measurements from different vantage points