diff --git a/main.py b/main.py
index a4603b7..830da15 100644
--- a/main.py
+++ b/main.py
@@ -17,7 +17,7 @@ class MainView(arcade.View):
     self.map = Map(SCREEN_WIDTH,SCREEN_HEIGHT,64,64)
     self.player = list(filter(lambda tank: tank.type=='player', Tank.ls))[0]
     self.physics_engine = arcade.PymunkPhysicsEngine(gravity=(0, 0),damping=0.01)
-    self.physics_engine.add_sprite(self.player.get_sprite(), friction=0.5, mass=1.0)
+    #self.physics_engine.add_sprite(self.player.get_sprite(), friction=0.5, mass=1.0)
     #self.physics_engine.add_sprite_list(Map.block_list, friction=0.5, collision_type="wall")
 
   def on_draw(self):
@@ -28,7 +28,7 @@ class MainView(arcade.View):
     Bullet.draw()
 
   def on_update(self,time_delta):
-    self.physics_engine.step()
+    #self.physics_engine.step()
     Tank.update()
     Bonus.update_list(time_delta)
     Bullet.update_list()
@@ -39,8 +39,8 @@ class MainView(arcade.View):
   def on_key_press(self,key,mod):
     if key == arcade.key.A:
       self.last_key = key
-      #self.player.move(-1,0)
-      self.player.move_engine(self.physics_engine,-1,0)
+      self.player.move(-1,0)
+      #self.player.move_engine(self.physics_engine,-1,0)
     elif key == arcade.key.D:
       self.last_key = key
       self.player.move(1,0)