Therefore, for a crank angle (φ) equal to 90◦, the angular velocity of the connecting rod (ωrod) is a maximum, the velocity of the slider (vslider) is zero, the angular acceleration of the connecting rod (αrod) is a positive value counterclockwise (CCW), and the acceleration of the slider (aslider) is a maximum to the left. Note that if the angular velocity of the crank is constant, meaning the angular acceleration is zero, then for this crank angle the angular acceleration of the connecting rod will also be zero.