remove friction

Signed-off-by: Stevedan Omodolor <[email protected]>

Author: stevedanomodolor

nav2_minimal_tb3_sim/urdf/gz_waffle_gps.sdf.xacro

@@ -330,15 +330,6 @@
             </sphere>
           </geometry>
           <surface>
-            <friction>
-              <bullet>
-                <mu>1</mu>
-                <mu2>1</mu2>
-                <slip1>0.035</slip1>
-                <slip2>0</slip2>
-                <fdir1>0 0 1</fdir1>
-              </bullet>
-            </friction>
             <contact>
               <bullet>
                 <soft_cfm>0</soft_cfm>
@@ -387,15 +378,6 @@
             </sphere>
           </geometry>
           <surface>
-            <friction>
-              <bullet>
-                <mu>1</mu>
-                <mu2>1</mu2>
-                <slip1>0.035</slip1>
-                <slip2>0</slip2>
-                <fdir1>0 0 1</fdir1>
-              </bullet>
-            </friction>
             <contact>
               <bullet>
                 <soft_cfm>0</soft_cfm>