Coefficients of Rolling Friction 
Coefficients of Rolling Friction for Wheels with Steel and Pneumatic Tires. McKibben and Davidson (Agri. Eng., 1939) give the data in Table calculator below on the rolling resistance of various types of wheels for typical road and field conditions. 

Kennedy's Theorem Rule in Kinematics Formula and Calculator 
When three bodies move relative to one another, they have three instantaneous centers, all of which lie on the same straight line. Kennedy's theorem, which states that the number of ICs, c, for a given mechanism is related to the number of links 

Scissor Lift Design and Analysis Equations 
he purpose of this document is to present mathematical equations for analyzing reaction forces in scissor lifts and to discuss several design issues including actuator placement, and strength and rigidity. 

