I can not tell you why he made it but I can tell you about it. Newton's cradle can be modeled with simple physics and minor errors if it is incorrectly assumed the balls always collide in pairs. If one ball strikes 4 stationary balls that are already touching, the simplification is unable to explain the resulting movements in all 5 balls, which are not due to friction losses. For example, in a real Newton's cradle the 4th has some movement and the first ball has a slight reverse movement. All the animations in this article show idealized action (simple solution) that only occurs if the balls are not touching initially and only collide in pairs.
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No, Isaac newton did not make Newton's balls. Newton's balls, also known as Newton's cradle, were actually popularized as an educational toy demonstrating conservation of momentum and energy.
Isaac Newton formulated the laws of motion. These should not be confused with the laws of planetary motion by Keplar
Isaac Newton the Elder, Iaac Newton was named after his father.
Isaac Newton and Hannah Newton were siblings. Hannah Newton was Isaac Newton's younger half-sister.
No, Isaac Newton was not Canadian. He was English.
Isaac Newton's father was also named Isaac Newton, but his mother's name is not well-documented in historical records.