Launcher: This tool provides body elements with an instantaneous, impulsive boost Run mode. Place up to five launchers anywhere in the simulation window or on a track. To place a launcher on a track, you must click within about 30 pixels above the track. Once you place a launcher on a track, you cannot move it off the track. With the Select tool, you can move and rotate the launcher.

To place a body element on a launcher, you must click on part indicated by the cursor in Figure 1. Figure 2 shows what the launcher-body system looks like after yo place the body element.

Fig. 1 Fig. 2

In the laucher's Properties Box, you can set its direction (in degrees) and its strength (in kg * m/s). The launched particle has a velocity equal to the strength divided by the particle's mass. The launcher effectively accelerates the particle instantaneously.