I'm trying to understand how mass factors into forces acting on particles in a simulation.
For the sake of argument, imagine a 1-dimensional simulation of a particle, whose position is 0 on the x-axis of this hypothetical 1D world.
If I implement a force/mass model, the particle's acceleration will be inversely proportionate to its mass, so if I give the particle a mass of 100 and push it with a force of 15, the resulting position on the x-axis after a single time step would be 0.15 (0 + 15 * (1/100)).
That all makes sense to me....heavier objects take more force to push.
However, what I'm failing to understand is what happens if my particle has a small mass. Imagine instead of a mass of 100, it has a mass of .00001. Using the same formula, its new position along the x-axis would be 1500000 (0 + 15 * (1/.00001)). That seems....wrong?
In real life, it makes sense that pushing a 2kg object takes twice the force of a 1kg object to go the same distance (and plugging those values into my formula yields that intuitive result)...but if I push a mote of dust with a tiny mass it doesn't soar halfway across the universe like the previous formula would suggest. I'm sure my error is obvious but I can't figure it out.
Any insights are appreciated!