Newtons Cradle Balance Balls Relieve Stress Desk Educational Decoration Z-Shaped Newton Pendulum for Your Desk(Black)

This pendulum ball is a scientific toy according to the principle of conservation of momentum. The ball can swing about 15s due to air friction. You can put it at desktop for relaxation and aspiration. It is also an educational toy for kids. Features: 【EDUCATION TOOL】The teacher teaches stereoscopic images, and fun learning is more conducive to improving the student's impression. Great education tool to help kids understand the confusing ideas shows the laws about conservation of momentum and energy 【Z-SHAPED NEWTONS CRADLE】Z-shaped newtons cradle for kids science puzzle desk toy newton balls .Watch as one ball on one end strikes the other sending the one on the opposite end into the air while the ones in the middle stay perfectly still. 【STRESS RELIEF TOY】Newtons cradle for adults a best choice to relieve stress,also a great idea for schooling youngsters in physics.And, a special desk decoration whether at home or in the office. 【5 STEAL BALLS】Newtons cradle high quality 5 steal balls,nylon thread. Will keep the newtons cradle balance balls in good condition longer.The ball swings about 50 times (about 15-20 seconds) with every hit due to frictional resistance,air resistance and other factors. Specifications: Condition: 100% Brand New Material: Plastic Frame + Metal Ball Color: White, Black (Optional) Ball Diameter: approx. 1.6cm / 0.63in Size: approx. 16*11.6*8.7cm / 6.30*4.57*3.43in Weight: approx. 310g Package Included: 1 x Pendulum Ball Note: 1. Please allow 0-2cm error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.