From ec5d07bfcd4c67e8a96313ef3468d2c9719d0ea4 Mon Sep 17 00:00:00 2001
From: jbphet <john.blanco@colorado.edu>
Date: Wed, 13 Nov 2019 13:26:18 -0700
Subject: [PATCH] blocked play of mass collision sound if mass was pushed, see
 #181

---
 .../view/MassBoundarySoundGenerator.js               | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/js/gravity-force-lab/view/MassBoundarySoundGenerator.js b/js/gravity-force-lab/view/MassBoundarySoundGenerator.js
index 3f488390..67ba26b5 100644
--- a/js/gravity-force-lab/view/MassBoundarySoundGenerator.js
+++ b/js/gravity-force-lab/view/MassBoundarySoundGenerator.js
@@ -40,11 +40,13 @@ define( require => {
 
       // function for playing the appropriate boundary sound
       const positionListener = position => {
-        if ( position === model.getObjectMinPosition( movableObject ) ) {
-          massSidePosition === 'left' ? outerBoundarySoundClip.play() : innerBoundarySoundClip.play();
-        }
-        else if ( position === model.getObjectMaxPosition( movableObject ) ) {
-          massSidePosition === 'left' ? innerBoundarySoundClip.play() : outerBoundarySoundClip.play();
+        if ( !model.massWasPushed() ) {
+          if ( position === model.getObjectMinPosition( movableObject ) ) {
+            massSidePosition === 'left' ? outerBoundarySoundClip.play() : innerBoundarySoundClip.play();
+          }
+          else if ( position === model.getObjectMaxPosition( movableObject ) ) {
+            massSidePosition === 'left' ? innerBoundarySoundClip.play() : outerBoundarySoundClip.play();
+          }
         }
       };
       movableObject.positionProperty.link( positionListener );