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A Newton's cradle is a desk demonstration device invented in the 1960s, with five balls of the same mass fixed by ropes and tightly arranged. It is also known as Newton's cradle balls, momentum conservation cradle balls, perpetual motion balls, physical collision balls, bumping balls, etc. Newton's cradle was first proposed by French physicist Edme Mariotte in 1676. When the ball on the far right is swung and collides with the other four tightly arranged balls on the return swing, the ball on the left will be ejected, and only the ball on the left will be ejected. Of course, this process is reversible. When the ball on the left is swung and hits other balls, the ball on the right will be ejected. When the two balls on the right are swung and collide with other balls at the same time, the two balls on the left will be ejected. Similarly, the opposite direction is also feasible, and it can be applied to more balls, three, four, five, etc.The principle of the five balls' change: the ball on the left receives momentum and passes it to the ball on the right, which is suspended side by side. The momentum is then passed from one to the next until it reaches the rightmost ball, which cannot pass it on and is ejected. This is a series of elastic collisions, which also include inelastic collisions and momentum. Since there are no other forces at play during the collision, the leftmost ball with a momentum of l(m)vl must pass its momentum to the rightmost ball, which is initially at rest. The ball on the right with a momentum of r(m)vr, after the collision, has the same momentum. All the balls that are collided have a velocity of vr to the right and a tendency to move to the right, which is known as momentum conservation. The energy before and after the collision must be consistent, and the vibration motion of the balls is ignored.

Newton's Cradle is a classic table ornament toy in Europe and the United States, and it is also a very beautiful scientific toy. It can reflect the physical laws discovered by the great physicist Isaac Newton, including the conservation of kinetic energy. Just pull the outer steel bead, then let go, and the steel bead on the opposite side will bounce up, then bounce back and forth dozens of times until the power disappears, so the higher you pull the steel bead, the greater the force, the more times it can bounce, the lower you pull the steel bead, the smaller the force, and the fewer times it will bounce. It is very interesting. This intelligent and artistic craft is absolutely the best choice for you to put on your desk. When you are bored, play a few times to let your mind empty, which will make you work more powerful.

A demonstration model of Newton's inertia law that was studied in middle school physics class. I miss the time in middle school; it can be kept as a souvenir or given to friends, or placed on the desk or coffee table at home for decoration. Five balls are hung in a row and in contact with each other, with their centers on the same line. First, pull the leftmost ball 15-20MM, then release it. The ball next to it stops after the collision, but the ball on the right swings, and the distance of the swing is roughly the same as the distance pulled on the left. If you pull both leftmost balls at the same time, both of them will stop after the collision, and then two more balls on the right will swing. When the right ball swings back and collides with the left ball, it will pass on its momentum. This is the law of momentum conservation, but because of Newton's inertia law, this kind of mutual collision will eventually stop due to the mutual cancellation of forces, so don't imagine it will keep swinging forever!When you lift a ball from the side with the maximum diameter level to the other four balls and then release your hand (lifting two or three balls to see different effects, endless fun, and it's up to your imagination), you will find that only one ball will swing back and forth. If it's two balls, both balls will naturally swing without the need for electricity, allowing the balls to be evenly affected, which is a small craft to pass the time when you are bored.In addition, a function has been derived that can help you when you find it difficult to fall asleep. Would you feel pain if you find yourself counting sheep and feel that you are being too childish? Then try this: lay on the table, move your eyes as the ball bounces, and you will fall asleep in no time!!!While having fun, don't forget the other kind of feedback it brings, which is education through entertainment.The law of conservation of momentum defines that if a system is not subjected to external forces or the sum of the forces acting on it is zero, then the total momentum of the system remains constant.Please remind you in advance, dear, because this model is based on the law of conservation of momentum. During the process of collision, the ball is affected by air resistance and will gradually stop swinging. Please do not believe what is said on the market that it can swing forever, as that is not realistic. If you want to achieve an eternal inertial swing, it is only possible under certain conditions!!