battery.png source=PhET notes=reused from faraday button-template.png source=PhET notes=NP button-template_pressed.png source=PhET notes=NP button_pressed.png source=PhET button_pressed_disabled.png source=PhET button_unpressed.png source=PhET button_unpressed_disabled.png source=PhET faucet_front.png author=PhET notes=NP faucet_pipe.png author=PhET notes=NP gray-arrow.png author=PhET notes=SR, modified from one in motion-series lightBulbBase.png source=PhET notes=reused from faraday lightBulbGlass.png source=PhET notes=reused from faraday lightBulbGlassMask.png source=PhET notes=reused from faraday lightBulbMask.png source=PhET notes=masked version of lightBulbGlass.png measuringTape.gif source=PhET measuringTape.png source=PhET notes=NP speedometer_point.png source=PhET notes=SR squeezer_background.png source=PhET notes=NP velocity_left.png author=phet notes=NP velocity_center.png author=phet notes=NP velocity_right.png author=phet notes=NP velocity_point.png author=phet notes=NP zoomBackgroundHorizontal.png author=phet zoomBackgroundVertical.png author=phet zoomInButton.png author=phet zoominButtonPressed.png author=phet zoomOutButton.png author=phet zoomOutButtonPressed.png author=phet