added sound for balloon hitting wall, see #484

js/balloons-and-static-electricity/view/BalloonNode.js

@@ -29,8 +29,9 @@ import SoundClip from '../../../../tambo/js/sound-generators/SoundClip.js';
 import soundManager from '../../../../tambo/js/soundManager.js';
 import Utterance from '../../../../utterance-queue/js/Utterance.js';
 import grabBalloonSound from '../../../sounds/balloon-grab-004_mp3.js';
-import releaseBalloonSound from '../../../sounds/balloon-release-004_mp3.js';
 import balloonHitsSweaterSound from '../../../sounds/balloon-hit-sweater_mp3.js';
+import releaseBalloonSound from '../../../sounds/balloon-release-004_mp3.js';
+import balloonHitsWallSound from '../../../sounds/wall-contact_mp3.js';
 import balloonsAndStaticElectricity from '../../balloonsAndStaticElectricity.js';
 import BASEA11yStrings from '../BASEA11yStrings.js';
 import BASEQueryParameters from '../BASEQueryParameters.js';
@@ -231,6 +232,17 @@ class BalloonNode extends Node {
       }
     } );
 
+    // sound generation for when the balloon hits the wall
+    const balloonHitsWallSoundClip = new SoundClip( balloonHitsWallSound, {
+      initialOutputLevel: 0.2
+    } );
+    soundManager.addSoundGenerator( balloonHitsWallSoundClip );
+    model.touchingWallProperty.link( touchingWall => {
+      if ( touchingWall  ) {
+        balloonHitsWallSoundClip.play();
+      }
+    } );
+
     // pdom
     balloonImageNode.focusHighlight = new FocusHighlightFromNode( balloonImageNode );
 

sounds/license.json

@@ -46,5 +46,13 @@
     "projectURL": "http://phet.colorado.edu",
     "license": "contact [email protected]",
     "notes": "created by Ashton Morris (PhET Interactive Simulations)"
+  },
+  "wall-contact.mp3": {
+    "text": [
+      "Copyright 2002-2020 University of Colorado Boulder"
+    ],
+    "projectURL": "http://phet.colorado.edu",
+    "license": "contact [email protected]",
+    "notes": "created by Mike Winters for use by PhET"
   }
 }