diff --git a/framework/scenes/world/actors/physics/utils.lua b/framework/scenes/world/actors/physics/utils.lua
index ceb5749..7350f44 100644
--- a/framework/scenes/world/actors/physics/utils.lua
+++ b/framework/scenes/world/actors/physics/utils.lua
@@ -39,11 +39,11 @@ local function _norm(spd, nor, bfac)
 end
 
 local function _toOnPx(axis, grav)
-    return axis - utils.math.sign(grav)
+    return axis + utils.math.sign(grav)
 end
 
 local function _checkGravOnAxis(norm, grav)
-    if (grav ~= 0 and norm == utils.math.sign(grav)) then
+    if (grav ~= 0 and norm == -utils.math.sign(grav)) then
         return true
     end
     return false