Projects Aidan Sanders, Andy Nguyen, Brian Powers

ADHD (Attention-deficit/hyperactivity disorder) is a disorder that affects people's focus, short term working memory, and processing speed. At the University of California of MIND Institute, people diagnose with ADHD are tested to read the direction of arrows launched in the air, while also strapping on a device that measures their movement. Based on the results, "Physical activity, like bouncing on a ball chair or even chewing gum, seems to allow these children to focus on difficult tasks." ADHD can severely hinder students who are striving to participate in the classroom environment. The design team, ANBPAS Projects, will design and create a fidget spinner to allow students to be physically active in a less distracting manner.

Andy's Rough Sketch.
Aidan's Rough Sketch.
Brian's Rough Sketch.

Forces to consider:

  • Air Resistance - the result of collisions of the object's leading surface with air molecules.
  • Tension - force that is transmitted through a string, rope, cable or wire when it is pulled tight by forces acting from opposite ends.
  • Centripetal - any motion in a curved path represents accelerated motion, and requires a force directed toward the center of curvature of the path.

Changes to account for forces:

  • Add more fillets, which adds more mass and makes the air travel around the spinner smoother.
  • Equal amounts of bearings on each side (symmetrical arms and bearings).
  • Longer arms, a larger bearing in the middle than the outside bearings.
Ball Bearing and Nickel Bearing Diameters
Prototype Piece
1st Fidget Design
Failure in the making.

2nd Fidget Design

The fidget spinner designed failed to meet the first minute mark in the highest tier when tested. The highest time it spun for was about 54 seconds. With Mr. Sherrer permission, team ANBPAS was able to design another fidget spinner.

Detailed Sketch
2nd Fidget Design in Onshape

Mr. Sherrer's suggested that angular momentum was what the 1st fidget spinner lacked. The nickels were close to the bearing, but by separating and taking out the nickels around the ball bearing, angular momentum can be achieved easily. Angular momentum can be described as how long the distance an object of mass has, and how much faster the momentum could be built up (the further away the dumbbells are from the body, the faster it is to spin). In short, longer arms would produce more angular momentum when inertia has been impacted by the momentum.

New design, new color.

Reference of video Mr. Sherrer pointed out.

Outcomes from testing:

  1. Fidget spinner has one of the nickel bearings split open.
  2. Solved by applying tape.
  3. Though tape held the nickels in place, the tape caused one arm to be heavier than the others.
  4. Added more tape on each side til the spinner was about balanced.
  5. Surprisingly, the new spinner was able to past the one minute threshold!

Faster building alternatives:

A new alternative instead of using the "metal files" is to use a wooden block. A much easier alternative than scratching or making a dent into the coin. Remember to place the wooden block horizontally and push on the block to register the coin into the bearing.

Testing in GVHS!

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