Features Stainless Metal thread: more sturdy and artistic. Diameter 0.35 mm; consisting of seven tiny metal steel wires; able to bear more than 50kg load. Much effective comparing to common fishing line, which is easily tangled with each other and broken.The time of swing extends to more seconds. Almost 5 to 20 seconds longer than common Newton's cradle.The employment of metal string helps to decrease the influential vibration and attribution of balls while crashing each other, thus a little bit faster than common one. A Brief History Newton's cradle, named after Sir Isaac Newton, is a device that demonstrates three main physics principles: conservation of energy, conservation of momentum and friction via a series of swinging spheres. Most people think that Isaac Newton invented the apparatus commonly called a Newton's Cradle, but he didn't. English actor Simon Preble invented the device in 1967 and named it in honor of Newton. In 1968 the first portable version hit the market and quickly gained popularity around the world as a fun, educational physics demonstrator.
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