What law is newtons cradle?

Answer 1

The Three Laws of Motion it demonstrates, it actually demonstrates all three.

The first law is that an object's motion is constant until a net force acts on it. If an object is at rest, its motion is 0. It'll stay at 0 until some other force acts on it. The balls in a Newton's Cradle will stay at rest until you move them. This is also called conservation of motion.

The second law is that motion is parallel and proportionate to force. Say you put x force on an object. Its motion will be x motion. If you put 2x force in, its motion will be 2x, and so on and so forth. If you raise a ball in a Cradle to 45 degrees from rest, its kinetic energy will transfer through the balls and make the ball on the other end of it *also* raise to 45 degrees. If this were a totally closed system, it would keep raising to 45 degree on each side, but since forces act on it (drag, gravity, head expenditure), it slows down over time and eventually stops. This is also a demonstration of the first law.

The third law is that for every action, there's an equal and opposite reaction. If you hold a ball in the air with your hand, not only are you holding it up, but it's pushing down against you. If you throw that ball at another ball, the fact that the second ball bounces away while the first ball stops is a demonstration that the second ball has 'pushed' the first ball away, so to speak; the motion of both is an example of the action/reaction law. In a Cradle, the same thing applies; if you drop a ball at one end, the fact that it stops (and that the energy is transferred to the other side in an equal manner (that is, two balls raised make two balls fly)) is based on the action/reaction paradigm.

Answer 2

• First Law (Inertia) - An object at rest will remain at rest, and an object in motion will remain in motion, at a constant velocity unless or until outside forces act upon it.
• Second law (Motion)- The net force acting upon an object is a product of its mass multiplied by its acceleration.
• Third law (Action/Reaction) - When one object exerts a force on another, the second object exerts on the first a force equal in magnitude but opposite in direction.