div class=trans-pagebutton class=gotoPage data-page=1Page 1button div class=trans-imagea href=https:reader042fdocumentsnetreader042viewer20220307145afddd417f8b9a944d8e0c65html5page1jpg target=_blank img data-url=documentbest-mobiles-have-parts-that-are-balanced-and-move-freely-if-the-parts-arent-balancedhtmlpage=1 data-page=1 class=trans-thumb lazyload alt=Page 1: sciencenetlinkscomsciencenetlinkscommediafiler20110927tf-snl-balancing-pointspdfThe best mobiles have parts that are balanced and move freely If the parts arent balanced loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII= data-src=https:reader042fdocumentsnetreader042viewer20220307145afddd417f8b9a944d8e0c65html5thumbnails1jpg width=140 height=200 adivdiv