Interactive Physics

Turning Forces On/Off

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Often, you will want a force to act for only part of the time in a simulation. Interactive Physics makes it easy to turn forces on and off.

This force will be 9.81 Newtons straight up until the simulation clock reaches 2.05 seconds. After 2.05 seconds, the force will have no effect at all.

Open the force's Properties Window.

In the box labeled "Active When", select the radio button under "Always" and enter one of the following:

Formula

Effect

time < ####

The force will be active as long as the simulation time is less than the value ####

time > ####

The force will be active after the simulation time reaches the value ####.

Formula	Effect
time < ####	The force will be active as long as the simulation time is less than the value ####
time > ####	The force will be active after the simulation time reaches the value ####.

last update June 15, 2000 by JL Stanbrough