Marvin & Milo

Speeding spinner

 

Speeding spinner

 

What you need:

Two ball bearings

Large rubber band

Glue

Two paper clips

 

Instructions

Wind a paper clip into a spiral, tie one end of the rubber band to it and glue it to a ball bearing. Do the same with the other end of the band.

Holding one ball bearing, rotate the other until the band is wound up. Keeping the ball bearings together, drop them onto a smooth surface.

 

Results & explanation

The ball bearings spin, speeding up as the band unwinds. Then the band contracts, winding up the other way. The cycle repeats, with the bearings spinning in the opposite direction.

The twisting in the band makes both bearings turn, so they roll round. When the band has untwisted they're moving so fast that they overshoot, making the band wind up the other way, which slows them to a pause.

 

See previous cartoons

Pinhole peeking

Dry times

Potato puncture

Fruity floater

Matching movement

Bubbles squared

Solid visions

Bottled tornado

Facing pressure

Mushrooming marshmallows

Take the money

Bubble bounce

Bead fountain

Jam jar session

Sixth-sense toy

Strange attraction

Impossible tower

Sinking sugar

Freezing time

Liquid strength

Mirror magic

Polar opposites

Unbalanced balloons 

Unsliced ice

Free fluid

Heavy atmosphere

Dogged drifter

Remote detector

Free fall ride

Electric slime

Pressure fountain

See more on physics.org

Cookie Settings