Modeling Multibody Systems  SimMechanics enables you to create
libraries of components that can be reused in many different
designs. You define bodies in terms of their mass, inertia, and
connection points. To create complex shapes, you assemble sets
of simple geometries, such as spheres, cylinders, and extrusions
defined in MATLAB, and SimMechanics calculates the resulting
mass and inertia automatically. The diagram that defines the
body clearly indicates all connections to the body, making it
easy to see your system’s topology. Parameters such as length
and mass can be calculated using MATLAB scripts and assigned
using MATLAB variables.  Parameterizing Bodies 5:42 Parameterize
bodies with MATLAB® variables. Reuse components and mechanisms
to build a scissor lift.  You connect bodies using joints and
constraints. These define the degrees of freedom permitted
between the bodies in your system, which dictate how your system
can move. You can define and connect actuators to these joints
to enable your system to