1C10.10 - Car on a Moving Sheet - Velocity Addition and Subtraction

Code Number:
Demo Title:
Car on a Moving Sheet - Velocity Addition and Subtraction
Velocity addition - Vector addition
Area of Study:
Toy cars with battery adapter for use with one or two batteries or the variable speed Pasco car, Cardboard or Masonite sheet, Suction Cups.

Place the Pasco car running at the desired velocity onto the Masonite sheet.  Move the sheet with the car direction for velocity addition and against the car direction for velocity subtraction.

Take out the battery adapter and add the second battery to make the car go with twice the velocity.

Take the two bolts and with a head of a bolt in each hand place and match the threads together.  Now as you orbit one bolts threads around the other bolts threads, the bolts will stay in exactly the same place, not screwing either together or away from each other.

  • Christopher Chiaverina, "The Versatile Constant Velocity Car", TPT, Vol. 58, #7, Oct. 2020, p. 524.
  • David L. Cone, "Floating in Real Rivers", TPT, Vol. 36, #6, Sept. 1998, p. 323.
  • Paul Hewitt, "Figuring Physics", TPT, Vol. 36, #4, Apr. 1998, p. 240
  • James F. Jackson, "Real Rivers / Ideal Streams", TPT, Vol. 37, #1, Jan. 1999, p. 3.
  • Gamze Sezgin Selcuk and Kemal Yurumezoglu, "Perception of Relative Motion Between Two Systems Through the Sense of Touch: The Example of the Moving Walkway", TPT, Vol. 51, #9, Dec. 2013, p. 549.
  • Julius Sumner Miller, Q25 & A25, Millergrams I – Some Enchanting Questions for Enquiring Minds, p. 26 & 84.
  • Julius Sumner Miller, Q28 & A28, Millergrams I – Some Enchanting Questions for Enquiring Minds, p. 28 & 86.
  • Julius Sumner Miller, Q33 & A33, Millergrams I – Some Enchanting Questions for Enquiring Minds, p. 31 & 87.
  • Julius Sumner Miller, Q132 & A132, Millergrams II – Some More Enchanting Questions for Enquiring Minds, p. 21 & 83.

Disclaimer: These demonstrations are provided only for illustrative use by persons affiliated with The University of Iowa and only under the direction of a trained instructor or physicist.  The University of Iowa is not responsible for demonstrations performed by those using their own equipment or who choose to use this reference material for their own purpose.  The demonstrations included here are within the public domain and can be found in materials contained in libraries, bookstores, and through electronic sources.  Performing all or any portion of any of these demonstrations, with or without revisions not depicted here entails inherent risks.  These risks include, without limitation, bodily injury (and possibly death), including risks to health that may be temporary or permanent and that may exacerbate a pre-existing medical condition; and property loss or damage.  Anyone performing any part of these demonstrations, even with revisions, knowingly and voluntarily assumes all risks associated with them.