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Formulas for mechanical engineering principles

Formulas for mechanical engineering principles:

Stress=Force/ cross sectionalarea
 s = F/APa
Strain = change in length/length e = x/L
Young’s modulus of elasticity = stress
strain E = s/ε Pa
Stiffness = force/extension
 k = F/δ. N/m
Modulus of rigidity = shear stress/shearstrain  G = t/γ Pa
Thermal strain = coefficient of linear expansion × temperature rise
e = aT
Ultimate tensile strength =
maximum load/original cross sectional area Pa
Moment = force × perpendicular distance
M = Fd N-m
Torque = force × perpendicular distance
T = Fd N-m
Power = torque × angular velocity
 P = Tw = 2pnT W
Horsepower 1 hp = 745.7 W
Torque = moment of inertia × angular acceleration
T = Ia N-m
Average velocity = distance travelled/ Timt taken
V=S/T. m/sec

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