This variable can be used to set the linear damping of the
instance, or it can be used to get the current linear damping. The
damping is the amount of "resistance" to forward movement that the
physics enabled instance has, with a lower value permitting the
instance to move and accelerate faster and a higher value making it
require a more forceful push.
if place_meeting(phy_position_x, phy_position_y,
phy_linear_damping = 10;
phy_linear_damping = 3;
The above code will check for a collision between the calling instance and instances of "obj_Water" and change the linear damping accordingly.