Ok so here's the question im looking at. A piston and cylinder mechanism is connected to a crank shaft. The crank is 50mm long, the connecting rod 250 mm long and the piston has a mass of 150g. If the engine speed is w rad/sec and the crankshaft torque T Nm calculate:- i) Max inertial force between the piston and connecting rod ii) Max. force in the connecting rod My question is where to start. I know Angular momentum = Inertia x w Force = Torque/ distance Torque = angular momentum x Inertia Now for the seond pat of the question, combining two of the above equations i get Force = (angular momentum X inertia) / distance. The problem is i have no idea where to start, if someone could give me a startpoint i would be greatfull. Im sure once i have that then the rest will fall into place