A body with mass m is sliding down an inclined plane, with some friction. What are the forces acting on the body, the acceleration, and the total sliding time?

Set all the parameters of the system, and run the simulation. Calculate the forces and the acceleration, and the sliding time using the constant acceleration formulas. Compare your results with the measurements in the table.
Note: For motion with friction, there is always some critical angle such that for any angle smaller, the body will stay at rest! The critical angle can be found by using the condition that the acceleration a will be greater than zero:  

From this obtain:

Repeat the simulation with small values of slope angle, and verify when motion is impossible.
Initial Values of Parameters
Height of slope (H) 20 m
Length of slope (S) 30 m
Friction coefficient (k) 0.4
Mass of body (m) 10 kg
Gravitational constant (g) 10 m/sec2