diff --git a/Assets/Audio.meta b/Assets/Audio.meta
new file mode 100644
index 0000000..2952005
--- /dev/null
+++ b/Assets/Audio.meta
@@ -0,0 +1,8 @@
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diff --git a/Assets/Scenes/test_conveyor_belt.unity b/Assets/Scenes/test_conveyor_belt.unity
index b1d2c0d..178cc81 100644
--- a/Assets/Scenes/test_conveyor_belt.unity
+++ b/Assets/Scenes/test_conveyor_belt.unity
@@ -615,6 +615,23 @@ PrefabInstance:
     m_AddedGameObjects: []
     m_AddedComponents: []
   m_SourcePrefab: {fileID: 100100000, guid: 79b1ab56bfd061d46a689142c3992685, type: 3}
+--- !u!1 &891192242 stripped
+GameObject:
+  m_CorrespondingSourceObject: {fileID: 2145288034412905379, guid: 0fb5ec34d66e2824c92ed0b720ca13df, type: 3}
+  m_PrefabInstance: {fileID: 6217297023818049519}
+  m_PrefabAsset: {fileID: 0}
+--- !u!114 &891192249
+MonoBehaviour:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 891192242}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: f935fa08cd417994097c7b59d2547f0d, type: 3}
+  m_Name: 
+  m_EditorClassIdentifier: 
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 PrefabInstance:
   m_ObjectHideFlags: 0
@@ -1333,6 +1350,10 @@ PrefabInstance:
     serializedVersion: 3
     m_TransformParent: {fileID: 0}
     m_Modifications:
+    - target: {fileID: 6230516344177671089, guid: 79b1ab56bfd061d46a689142c3992685, type: 3}
+      propertyPath: m_Mass
+      value: 0.5
+      objectReference: {fileID: 0}
     - target: {fileID: 7217391875016474312, guid: 79b1ab56bfd061d46a689142c3992685, type: 3}
       propertyPath: m_LocalPosition.x
       value: 22.29
@@ -1555,7 +1576,10 @@ PrefabInstance:
     m_RemovedComponents: []
     m_RemovedGameObjects: []
     m_AddedGameObjects: []
-    m_AddedComponents: []
+    m_AddedComponents:
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+      insertIndex: -1
+      addedObject: {fileID: 891192249}
   m_SourcePrefab: {fileID: 100100000, guid: 0fb5ec34d66e2824c92ed0b720ca13df, type: 3}
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diff --git a/Assets/Scripts/WeightDetector.cs b/Assets/Scripts/WeightDetector.cs
new file mode 100644
index 0000000..bb1a178
--- /dev/null
+++ b/Assets/Scripts/WeightDetector.cs
@@ -0,0 +1,44 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class WeightDetector : MonoBehaviour
+{
+    HashSet<Rigidbody> enteredBodies = new HashSet<Rigidbody>();
+
+    private void OnCollisionEnter(Collision collision)
+    {
+        var rb = collision.rigidbody;
+
+        if (rb)
+        {
+            enteredBodies.Add(rb);
+        }
+    }
+
+    private void OnCollisionExit(Collision collision)
+    {
+        var rb = collision.rigidbody;
+
+        if (rb)
+        {
+            enteredBodies.Remove(rb);
+        }
+    }
+
+    public float GetTotalWeight()
+    {
+        float totalMass = 0;
+        foreach (var body in enteredBodies)
+        {
+            totalMass += body.mass;
+        }
+
+        return totalMass;
+    }
+
+    private void Update()
+    {
+        Debug.Log(GetTotalWeight());
+    }
+}
diff --git a/Assets/Scripts/WeightDetector.cs.meta b/Assets/Scripts/WeightDetector.cs.meta
new file mode 100644
index 0000000..9774895
--- /dev/null
+++ b/Assets/Scripts/WeightDetector.cs.meta
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