Your book uses mg = weight w
{"Image DocumentName": "Your book uses mg = weight w", "Image ImageDescription": "Downhill force = mass x gravity x sine of dip. F0 = w sin (dip) (1) a is the same as the dip. Shear Force = F0 = w sin(\u03b1) dip. Aside: Bloom confuses shear force with shear stress. Stress = Force / unit area. Stress units are, e.g. Newtons/m2. or pounds force/ inch2 aka psi. That said, we will skip the issue by staying with Forces. w. h. \u03b1.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}