Particle
force is a multiplier of the interaction between particles and
objects
Lets
get take a look to that scene.
We have a sphere with dynamics applied to it, a circle emitter,
and a gravity
What we want to see how the ball is raised by the water gush,
and how particle force affect it
Particle force is a property of the object and you will find
it at Object´s Particle Interaction tab.

Don´t
forget to setup the proper relations at the scene tree window.

Below, you can see the effect of diferent values applied to
the ball.
TIP: Remenber that Particle Force is a
multiplier, and works independently of the mass of the object.
I mean, the mass of the object doesn´t change, its
dynamics with other objects will be calculated with its
mass,
but the reacction against fluids will be aumented or reduced.
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