The content of this simulation is excellent. The results of the simulation for experiments such as determining the maximum static frictional force, the kinetic frictional force, and accelerations agree with calculations. The frictional force changes appropriately from static to kinetic when objects start moving, and similarly when they stop.
The simulation allows for investigation of a diverse set of properties relating to friction, applied force, motion graphs, and mass. A free body force diagram is shown; the applied force can be varied, as can the mass of the object,
gravitation, and friction coefficients. The results are shown as graphs of force, acceleration, velocity, and position vs. time. A user can also record, playback, and investigate a simulation run.