![]() The central ball swings without any apparent interruption. An idealized Newton's cradle with five balls when there are no energy losses and there is always a small separation between the balls, except for when a pair is colliding Newton's cradle three-ball swing in a five-ball system. The kinetic energy, as determined by the velocity, is converted to potential energy as it reaches the same height as the initial ball and the cycle repeats. Because they are the same weight, the same velocity indicates all the momentum and energy are also transferred. ![]() Neglecting the energy losses, the left ball strikes the right ball, transferring all the velocity to the right ball. Physics explanation Newton's cradle with two balls of equal weight and perfectly efficient elasticity. Thus, this first-level explanation is a true, but not a complete description of the motion. However, if the colliding balls behave as described above with the same mass possessing the same velocity before and after the collisions, then any function of mass and velocity is conserved in such an event. Some say that this behavior demonstrates the conservation of momentum and kinetic energy in elastic collisions. When two (or three) balls are dropped, the two (or three) balls on the opposite side swing out. There are slight movements in all the balls after the initial strike, but the last ball receives most of the initial energy from the impact of the first ball. This is similar to bouncing one coin of a line of touching coins by striking it with another coin, and which happens even if the first struck coin is constrained by pressing on its centre such that it cannot move. Any efficiently elastic material such as steel does this, as long as the kinetic energy is temporarily stored as potential energy in the compression of the material rather than being lost as heat. The impact produces a sonic wave that propagates through the intermediate balls. This shows that the last ball receives most of the energy and momentum of the first ball. The ball on the opposite side acquires most of the velocity of the first ball and swings in an arc almost as high as the release height of the first ball. When it is let go, it strikes the second ball and comes to nearly a dead stop. When one of the end balls ("the first") is pulled sideways, the attached string makes it follow an upward arc. ![]() It is also known as Newton's pendulum, Newton's balls, Newton's rocker or executive ball clicker (since the device makes a click each time the balls collide, which they do repeatedly in a steady rhythm). The device is named after 17th-century English scientist Sir Isaac Newton and designed by French scientist Edme Mariotte. The last sphere swings back and strikes the nearly stationary spheres, repeating the effect in the opposite direction. When one sphere at the end is lifted and released, it strikes the stationary spheres, transmitting a pressure or sonic wave through the stationary spheres that creates a force that pushes the last sphere upward. The Newton's cradle is a device that demonstrates the conservation of momentum and the conservation of energy with swinging spheres. ![]() JSTOR ( March 2021) ( Learn how and when to remove this template message).Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. A subscription is required for Apple TV+.This article needs additional citations for verification.More details are available from Appleās trade-in partner for trade-in and recycling of eligible devices. Apple or its trade-in partners reserve the right to refuse or limit quantity of any trade-in transaction for any reason. Desktop computer trade-in is currently only available online and some stores may have additional requirements. Offer may not be available in all stores, and may vary between in-store and online trade-in. In-store trade-in requires presentation of a valid photo ID. Actual value awarded is based on receipt of a qualifying device matching the description provided when estimate was made. Trade-in value may be applied towards qualifying new device purchase or added to an Apple Gift Card. You must be at least 18 years old to be eligible to trade in for credit or for an Apple Gift Card. Trade-in values will vary based on the condition, year and configuration of your eligible trade-in device.
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