Friction is the force that resists the relative motion of material elements sliding against each other, which in the GameMaker Studio 2 physics world, translates as the loss of momentum caused by the collision of two instances with fixtures bound to them. 所以当两个实例碰撞时，它们的运动受到这个值的影响，高摩擦力将导致更大的动量损失。Note that the friction is usually set to a value between 0 and 1, but you can use any non-negative value if required.
|fixture||the index of the fixture|
|friction||the friction of the fixture|
The code above will set the friction of the fixture indexed in "fix_brick" to 0.1.