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Assets/Standard Assets/ParticleSystems/Scripts/ExplosionPhysicsForce.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace UnityStandardAssets.Effects
+{
+    public class ExplosionPhysicsForce : MonoBehaviour
+    {
+        public float explosionForce = 4;
+
+
+        private IEnumerator Start()
+        {
+            // wait one frame because some explosions instantiate debris which should then
+            // be pushed by physics force
+            yield return null;
+
+            float multiplier = GetComponent<ParticleSystemMultiplier>().multiplier;
+
+            float r = 10*multiplier;
+            var cols = Physics.OverlapSphere(transform.position, r);
+            var rigidbodies = new List<Rigidbody>();
+            foreach (var col in cols)
+            {
+                if (col.attachedRigidbody != null && !rigidbodies.Contains(col.attachedRigidbody))
+                {
+                    rigidbodies.Add(col.attachedRigidbody);
+                }
+            }
+            foreach (var rb in rigidbodies)
+            {
+                rb.AddExplosionForce(explosionForce*multiplier, transform.position, r, 1*multiplier, ForceMode.Impulse);
+            }
+        }
+    }
+}