Adds a force that will act at a given time in every particle's life. For example a force set to start at time 2 and end at time 3 will start influencing particles when they have been alive for 2 seconds. It will continue to act on those particles until they have been alive for 3 seconds. The force's influence is defined by an x and y value that represent acceleration in units per second. For example a force with x=5 will adjust a particle's horizontal speed by adding 5 units for every second the force is active, if the force is only active for 0.5 seconds the particle would then be moving 2.5 units per second faster towards the right. Multiple forces can be acting on a particle at the same time if their timings overlap.
AddParticlesForce( ID, starttime, endtime, x, y )
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