Getting Flexible with Soft Bodies and Cloth - Mastering Blender - page 265

Figure 5-2 Mesh edges are treated as springs in soft body simulation.
When a soft body simulation has been created on an object, you can set parameters to determine how these
“springs” react to forces and how the soft body simulation itself interacts with the mesh. These parameters can
be set in the Soft Body tab in the Physics properties area shown in Figure 5-3 , after you have activated soft
bodies for an object by clicking Soft Body. The parameters to determine forces are as follows:
Friction Friction determines the degree to which the soft body simulation is affected by external forces.
Mass Mass determines how much force is necessary to deform the soft body. Higher mass values lead to
slower movement, less responsiveness to impacts, and greater momentum after the mesh is in motion.
Speed Speed determines how quickly the simulation moves. Unlike Mass, however, Speed does not affect
how much force is needed to deform the object.