We are experiencing issues that prevent checkout in Internet Explorer 8.

You can browse and even save your cart, but you'll need to use another browser or a different device to place your order. Sorry for the inconvenience.

ThinkGeek Holiday Giftcade

FREE SHIPPING ON ORDERS $75+

US ECONOMY ONLY • NO CODE • DOESN'T COMBINE WITH OTHER OFFERS

Pit & Pendulum

Line in the sand

  • Instant relaxation for your office or home
  • Physics in motion
  • Some assembly required
Read more...

$29.99

Out of stock

 ( Est. 6-9 weeks )

Email Me

or

Line in the sand

The conical pendulum has been studied for centuries. Watching its circular motion has brought us greater understanding about the movements of the planets and the theory of gravity. 

But not just gravity. Also tension. It is the interplay between these two forces that primarily describe the patterns in which the bob moves. (We're going to ignore air resistance for now.) It's a beautiful dance, but it's difficult to see just how elegant and complex the back-and-forth is until you find a way to track the movement. By sharpening the mass to a point and having it describe its path through a shallow dish of sand, you can see the arc the pendulum traces on its regular rhythmic cycle as it is torn between the two forces. Back and forth, to and fro, the pendulum swings into gorgeous elliptical loops and whorls. 

Product Specifications  
  • Pit & Pendulum
  • Instant relaxation for your office or home
  • Materials: Wooden scaffold and base, stainless steel bob and arm
  • Includes sand 
  • Some assembly required
  • Dimensions: 6 3/4" square base x 15 1/4" tall
  • Weight: 1 lb. 6 oz.
  • Warning: This is NOT a toy. Use with extreme care. This product contains a functional sharp edge. Keep away from children.
  • Ages 14+

Pit & Pendulum Video:

Wanna chat about it?

Have questions about Pit & Pendulum or your order? We monitor these comments daily, but it may be faster to email us directly or call us at 1-888-GEEKSTUFF.

Timmy and the TG Staff think you'll like...

Customer Action Shots

Send us your action shots!

Your Fellow Smart Masses Also Bought