1. The problem statement, all variables and given/known data Hello, I have an exam later in the week and I'm trying to understand how to this problem. 2. Relevant equations Sum of forces. Sum of moments. 3. The attempt at a solution I broke the mechanism into 3 pieces, the crank, connecting rod, and slider and then began to analyze each piece with the sum of moments and sum of forces on each. It seems that I am missing too many unknowns. For example on this sum of forces on crank what is the mass and acceleration of the crank. Thanks in advance for the help.