i thought the entire purpose was to stay in motion until stopped . do they stop on their own?

yes, they will do stop on their own after 50-60 seconds

Does this thing get rusted?

No. We have had ours for a few years now and it is still in like new condition. No rust

What is the length? The title states 11" while the product descriptions specifies 9".

The length of the marble base is 9.06 inches, the width is 6.69 inches, and the diagonal length of the marble base is about 11 inches.

we had one before from a mall and the balls were tangled so we couldn't use it does this one have the balls where they don't tangle ?

The one I ordered through Amazon was packaged very carefully with each ball and string wrapped in plastic. The strings were not tangled. The unit has not tangled; the balls are heavy weight and seem to be good quality. I am sorry that you had that experience. I enjoy the cradle so much; it is intriguing.

Newtons Cradle Pendulum With 7 Balls

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115807CFA

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Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚖️ Balance your hustle with timeless physics elegance

NANO TECH DURABILITY - Ultra-thin, high-impact nylon lines engineered with cutting-edge nano technology for lasting performance.
BONUS SPARE BALL INCLUDED - Never miss a beat with an extra ball and easy wire replacement manual—stay in the flow.
ELEVATE YOUR WORKSPACE VIBE - A sophisticated executive toy that sparks logical thinking and adds a sleek, modern touch to any office.
MESMERIZING 70 SECOND SWING - Experience the longest, smoothest momentum that captivates your desk and mind alike.
PRECISION MARBLE BASE BALLS - Sleek black marble base paired with perfectly balanced 7+1 balls for flawless physics in motion.

The CERROPI Newton Cradle features 7 precision marble balls plus a spare, suspended on ultra-durable nano-tech nylon lines, delivering an impressive 70+ second swing time. Designed as a sleek black marble desk accessory, it combines scientific intrigue with executive style, perfect for enhancing focus and adding a modern aesthetic to your workspace.

Specifications

ASIN	B082CNJXXF
Age Range Description	Adult/Kid
Best Sellers Rank	#19,963 in Toys & Games ( See Top 100 in Toys & Games ) #183 in Educational Science Kits
Brand Name	CERROPI
Color	Black
Customer Reviews	4.6 4.6 out of 5 stars (566)
Educational Objective	Logical Thinking
Included Components	1PC Newtons Cradle
Indoor Outdoor Usage	Indoor
Item Dimensions	9.06 x 6.69 x 6.69 inches
Item Type Name	science-kits
Item Weight	2200 g
Manufacturer	CERROPI
Manufacturer Maximum Age (MONTHS)	720
Manufacturer Minimum Age (MONTHS)	60
Manufacturer Part Number	2056
Manufacturer Warranty Description	60 Day Warranty Against Manufacturer Defects
Material Type	Marble
Model Number	2056
Number of Packs	1
Number of Players	1
Operation Mode	Manual
Size	Medium
Supported Battery Types	No batteries required
Theme	Home Decor
UPC	715668938236 746653837340 745245575738
Unit Count	77.6 Ounce

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