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Rotating Platform

Avg. Ratings: 2.0 (3 Reviews)


Total Ratings: 3
Avg. Ratings: 2.0 out of 5

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Yes: 1 No: 0 
Education / Teacher / Santa Cruz, CA
Yes, I recommend
The turntable works pretty well for demonstrating angular momentum conservation by standing on it with weights in both hands or a rotating bicycle wheel. There are probably much higher quality platforms available for a much higher price, but for the size and budget of my school, this one had low enough friction that I could do the demonstrations successfully. I like this style better than the pancake shaped ones, because the bearings are so close to the center that they exert little frictional torque. With the other style, even excellent bearings exert more frictional torque because the bearings are farther from the rotation axis. If the frictional torque is too high, certain demonstrations of angular momentum conservation won't work well. Because this turntable has only three feet, it is a bit prone to tipping, so it needs to be approached with caution. This is very likely a teacher-only demonstration rather than an activity that students will participate in, but that can be left to the discretion of the instructor. I also use it to demonstrate moment of inertia by placing two weights on it and inviting students to place the weights close to or far from the center and then feel how easily it can be rotated (i.e. how much torque is required to change its rotation) in the various configurations. The bottom line is, for under $100, this is the only turntable I've found that was adequate for my demonstrations. Even though I only use it a few days a year, I'm sure my students will remember being able to feel the concepts I am teaching.
Reply associate Published 08/06/2019
Thank you for sharing.
Was this review helpful? Yes No
Yes: 2 No: 0 
AP Physics  / Teacher / Virginia
No, I didn't recommend
Used this device to demonstrate the Conservation of Angular Momentum two times and the platform fell off the rotating shaft. This could be such a great device. I do not recommend!
Reply associate Published 12/09/2019
Hello valued customer, thank you for your review. I am sorry that the rotating platform malfunctioned and I'd like to apologize for the inconvenience. We will be contacting you via email to see if the manufacturer can repair the equipment. Thank you for your review, your feedback is important.
Was this review helpful? Yes No
Yes: 4 No: 1 
Sunnnyvale, CA
No, I didn't recommend
Rotating Platform fell apart quickly - In its first use in my high school classroom to demonstrate conservation of angular momentum, and under supervision (so it wasn't being abused) the platform and bearing detached from the base. It appears to be press-fit and can't be repaired.

Before it fell apart it seemed very sturdy and had very nice low friction. But now its useless and I am contacting the vendor to deal with replacement.
470149-074CS 640.05 USD InStock
Rotating Platform
Educational Materials Physics Educational Materials Mechanics Learning Activities
Educators demonstrate experiments in angular momentum and rotational kinetic energy with the Rotating Platform.

  • Platform Height: 6 cm
  • Platform Width: 31 cm dia.
  • Weight: 4.5 kg (10 lb.)
  • All-Metal Construction
  • Low-Friction Rotating Surface
This low-profile platform features a low-friction rotating surface. Students can use a pair of dumbbells to feel the effects of centripetal force and conservation of momentum.

The durable, all-metal construction stands up to years of use. The platform's size is 6 x 31 cm dia., and it weighs 4.5 kg (10 lb.).

Accessories information: For a first-hand experience of gyroscope forces, students can stand on the platform while holding our Bicycle Wheel Gyroscope, available separately.





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