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How Newton’s Cradles Work

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Magnetic swinging balls

Newton's cradle is a device that demonstrates conservation of momentum and energy using a series of swinging spheres. A typical Newton's cradle consists of a series of identically sized metal balls suspended in a metal frame ..

in cage of steel rings), and was supported from the ceiling using extremely strong magnets.


Lift one of the 5 steel balls at either end and let it swing back. Fair warning: it's totally Kikkerland Magnetic Decision Maker $ In Stock. Ships from and.

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Description:Then they reverberate back and forth like this about 10 times until the first ball stops connecting with the second ball. Sudden changes in the force between the atoms of a material builds up to form a pressure wave. Making the contact surfaces flatter can overcome this to an extent by distributing the compression to a larger amount of material but it can introduce an alignment problem. The size of the steel balls is limited because the collisions may exceed the elastic limit of the steel, deforming it and causing heat losses. Heat and friction losses[ edit ] This discussion has neglected energy losses from heat generated in the balls from non-perfect elasticity, friction in the strings, friction from air resistance, and sound generated from the clank of the vibrating balls. But in a real Newton's cradle the fourth ball swings out as far as the fifth ball. This separates the balls, but they come back together just before as the fifth ball returns.

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