1. Falling stone
Simulate a stone falling from an initial height of 100m on the surface of the earth. Graph its Kinetic energy.
Step 1. Identify objects to create
Gravitational field
Stone
Graph
Step 2. Create the Gravitational field.
Select FIELD from the CONTROL window.
Type the name of the field e.g. gfield.
Type the Fx, Fy, Fz components of the force acting on a particle due to the above field.
Assume that the y axis is at right angles to the surface of the earth.
For Fx 0
For Fy mass*9.81
For Fz 0
Type the name of the quantity the field acts on, in this case type mass, and press Enter.
Step 3. Use the PARTICLE button to create a particle
B) Create the stone.
Select PARTICLE type the name of the particle e.g. stone.
Type initial position components of the stone 50, 100, 50
Type initial velocity components of the stone 0, 0, 0
Type the value for its mass 5
Type coefficients for the velocity and force displayed vectors 1, 1
These coefficients are used only for display purposes.
Type the color for the trace of the particle 12 accepts 1-15.
Finally create any quantities the particle will have. In this example the particle will have only mass, because mass is a quantity every particle must have it is created separately, and has the value we specified previously.
Step 4. To display the kinetic energy of the stone.
Select GRAPH from the CONTROL window.
Type a name for the graph.
Select the particle stone so the graph will relate to this particle.
Type a name for the window (monitor) that displays the graph.
Type t so the X axis displays time.
Type the formula 0.5*m*vy*vy so the Y axis displays kinetic energy. (See Appendix A).
Click EXIT.
Step 5. Save the above simulation senario in a file. Select SAVE, type the filename e.g. gfield.
Step 6. Select RUN
Step 7. If the scaling is not right adjust it by clicking the first button on the graph window. If the solution is inaccurate select another method or method parameters.
Step 8. Select RUN
Step 9. Repeat steps 7 and 8 until a satisfactory simulation achieved than save it.
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