1<script src="https://code.jquery.com/jquery-1.10.1.min.js"></script>
2<script src="https://code.jquery.com/ui/1.10.4/jquery-ui.js"></script>
3<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/latest/TweenMax.min.js"></script>
4
5<div id="newton-craddle">
6
7 <div id="str-b2" class="string-back"></div>
8 <div id="str-b3" class="string-back"></div>
9 <div id="str-b4" class="string-back"></div>
10 <div id="str-b5" class="string-back"></div>
11 <div id="ball-1" class="ball-holder"><div class="ball"></div></div>
12 <div id="ball-2" class="ball-holder"><div class="ball"></div></div>
13 <div id="ball-3" class="ball-holder"><div class="ball"></div></div>
14 <div id="ball-4" class="ball-holder"><div class="ball"></div></div>
15 <div id="ball-5" class="ball-holder"><div class="ball"></div></div>
16
17
18 </div>