diff --git a/js/common/model/CollisionEngine.js b/js/common/model/CollisionEngine.js
index 9e88a777..553b91ee 100644
--- a/js/common/model/CollisionEngine.js
+++ b/js/common/model/CollisionEngine.js
@@ -332,7 +332,7 @@ class CollisionEngine {
   detectBallToBorderCollisions( elapsedTime ) {
     assert && assert( typeof elapsedTime === 'number' && elapsedTime >= 0, `invalid elapsedTime: ${elapsedTime}` );
 
-    this.playArea.reflectsBorder && this.ballSystem.balls.forEach( ball => {
+    this.playArea.reflectingBorder && this.ballSystem.balls.forEach( ball => {
 
       // Only detect new ball-border collisions if it hasn't already been detected.
       if ( !CollisionLabUtils.any( this.collisions, collision => collision.includesBodies( ball, this.playArea ) ) ) {
diff --git a/js/common/model/PlayArea.js b/js/common/model/PlayArea.js
index 4bdd8662..37993755 100644
--- a/js/common/model/PlayArea.js
+++ b/js/common/model/PlayArea.js
@@ -49,7 +49,7 @@ class PlayArea {
       isGridVisibleInitially: false,
 
       // {boolean} - indicates if the PlayArea's borders reflect initially (and after resetting).
-      reflectsBorderInitially: true,
+      reflectingBorderInitially: true,
 
       // {number} - the initial elasticity of the PlayArea (and after resetting), as a percentage.
       initialElasticityPercent: ELASTICITY_PERCENT_RANGE.max
@@ -66,7 +66,7 @@ class PlayArea {
 
     // @public {Property.<boolean>} - indicates if the Balls reflect at the Border of the PlayArea bounds. This Property
     //                             is manipulated in the view.
-    this.reflectingBorderProperty = new BooleanProperty( options.reflectsBorderInitially );
+    this.reflectingBorderProperty = new BooleanProperty( options.reflectingBorderInitially );
 
     // @public {Property.<boolean>} - indicates if the grid of the PlayArea is visible. This is placed inside of the model
     //                             since the visibility of the grid affects the drag-snapping of Balls.
@@ -99,7 +99,7 @@ class PlayArea {
    *
    * @returns {boolean}
    */
-  get reflectsBorder() {
+  get reflectingBorder() {
     return this.reflectingBorderProperty.value;
   }
 
diff --git a/js/inelastic/model/InelasticCollisionEngine.js b/js/inelastic/model/InelasticCollisionEngine.js
index 2d9f13a2..499b9c52 100644
--- a/js/inelastic/model/InelasticCollisionEngine.js
+++ b/js/inelastic/model/InelasticCollisionEngine.js
@@ -229,7 +229,7 @@ class InelasticCollisionEngine extends CollisionEngine {
     assert && assert( this.rotatingBallCluster, 'cannot call detectBallClusterToBorderCollision' );
 
     // No-op if the PlayArea's border doesn't reflect or the cluster-to-border collision has already been detected.
-    if ( !this.playArea.reflectsBorder ||
+    if ( !this.playArea.reflectingBorder ||
          CollisionLabUtils.any( this.collisions, collision => collision.includes( this.rotatingBallCluster ) ) ) {
       return; /** do nothing **/
     }
@@ -282,7 +282,7 @@ class InelasticCollisionEngine extends CollisionEngine {
   willBallClusterCollideWithBorderIn( dt ) {
     assert && assert( typeof dt === 'number', `invalid dt: ${dt}` );
     assert && assert( this.rotatingBallCluster, 'cannot call willBallClusterCollideWithBorderIn' );
-    assert && assert( this.playArea.reflectsBorder, 'cannot call willBallClusterCollideWithBorderIn' );
+    assert && assert( this.playArea.reflectingBorder, 'cannot call willBallClusterCollideWithBorderIn' );
 
     // Get the states of the Balls after the time-delta.
     const rotationStates = this.rotatingBallCluster.getSteppedRotationStates( dt );
diff --git a/js/intro/model/IntroPlayArea.js b/js/intro/model/IntroPlayArea.js
index 84cf9e95..e20bb560 100644
--- a/js/intro/model/IntroPlayArea.js
+++ b/js/intro/model/IntroPlayArea.js
@@ -26,7 +26,7 @@ class IntroPlayArea extends PlayArea {
     options = merge( {
 
       isGridVisibleInitially: true,
-      reflectsBorderInitially: false,
+      reflectingBorderInitially: false,
       bounds: new Bounds2(
         PlayArea.DEFAULT_BOUNDS.left,
         -CollisionLabConstants.PLAY_AREA_1D_HEIGHT / 2,
@@ -46,8 +46,8 @@ class IntroPlayArea extends PlayArea {
     } );
 
     // Verify that the border never reflects for the 'Intro' screen.
-    assert && this.reflectingBorderProperty.link( reflectsBorder => {
-      assert( reflectsBorder === false, 'No reflecting borders for the Intro screen.' );
+    assert && this.reflectingBorderProperty.link( reflectingBorder => {
+      assert( reflectingBorder === false, 'No reflecting borders for the Intro screen.' );
     } );
   }
 }