This example shows the use of the Simscape™ Lever block in a linkage mechanism. Lever 1 and Lever 4 are first class levers with the fulcrum at the end. Lever 3 is a second class lever with the fulcrum in the middle. Lever 2 is a summing lever driven by the first and the third levers.
The mechanism is excited by two force sources. One source abruptly applies force at 1 second to Lever 1, then the other source abruptly applies force at 2 seconds to Lever 3.