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STEM @ Home

Coin tower trick: Inertia

3/31/2020

 
STEM @ Home presents: Newton's first law of motion: An object in motion tends to stay in motion and an object at rest tends to stay at rest.
You need a butter knife, a table and a stack of coins.
Stack the coins near the edge of the table, within reach of the butter knife. Swipe the butter knife horizontally at the bottom coin. The stack stays upright but the bottom coin goes shooting off. Why?
You exerted an outside force on the bottom coin, putting in motion, while the stack was untouched so it stays at rest. And don't forget about the friction between all of the coins in the stack.

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  • Home
  • Your Account
    • SAILS Catalog
    • Get the SAILS APP
    • Get a Library Card
    • Sign up for Newsletters
  • Digital Resources
    • eBooks
    • eAudio
    • eMagazines
    • Online for Kids
    • Research It
    • CreativeBug
    • CareerPrep
    • TestPrep
  • NeedtoKnow
  • Children's Room
    • OnlineKids
    • Join the For Kids Mailing List
    • 1000Books
    • earlyliteracy
    • kindergartenready
    • Homeschool
  • Library Calendar
    • Community Calendar
  • ArtShare
  • Reading Suggestions
    • Novelist
    • InDemand
    • Faux Book Club
    • YourNextGreatRead
  • Social Services
    • MentalHealth
    • SelfCare
  • Friends of the Library
  • About
    • borrowing >
      • Search Catalog
      • Commonwealth Catalog
    • Library News
    • Local History
    • Volunteers and Donations
    • Policies
    • autorenew
    • FAQ
  • Museum Passes
    • Book Now
    • Passes at other libraries
  • Services
    • takeout
    • Passport
    • Library of Things >
      • Hotspot
    • Disc Cleaning
    • Tax Forms
    • Shredding Service
    • Package Pick Up
    • Computers/Fax/Printing
    • HomeboundDelivery
    • Conference Room
  • Pumpkin