Surface force

Surface force denoted fs is the force that acts across an internal or external surface element in a material body. Surface force can be decomposed into two perpendicular components: normal forces and shear forces. A normal force acts normally over an area and a shear force acts tangentially over an area. Surface force denoted fs is the force that acts across an internal or external surface element in a material body. Surface force can be decomposed into two perpendicular components: normal forces and shear forces. A normal force acts normally over an area and a shear force acts tangentially over an area. Since pressure is f o r c e a r e a = N m 2 {displaystyle {frac {force}{area}}=mathrm {frac {N}{m^{2}}} } , and area is a ( l e n g t h ) ⋅ ( w i d t h ) = m ⋅ m = m 2 {displaystyle (length)cdot (width)=mathrm {mcdot m} =mathrm {m^{2}} } ,