1K20.35 - Inclined Plane - Angle of Repose

Code Number:
Demo Title:
Inclined Plane - Angle of Repose
Coefficient of Static and Kinetic Friction
Area of Study:
Inclined Plane with Pulley, Spring Scale (Newton's), Wood Blocks with Tire Treads, and Bricks.

Clamp the inclined plane to the table and set at a desired angle.  The vector forces on the block may be shown with a Newton Scale.

  • Thomas B. Greenslade Jr., "Riffs on the Inclined Plane", TPT, Vol. 61, #9, Dec. 2023, p. 759.
  • Huai-Yi Chen, Hwa-Ming Nieh, Shih-Wei Ko, "Acceleration Measurement Using Arduino and a Smartphone for the Motion of Objects on an Inclined Plane", TPT, Vol. 60, #5, May 2022, p. 351.
  • Chris I. Lander, "TiltTray: A 3D-Printed Apparatus to Teach Inclined-Plane Physics Through Smartphone Portrait-Landscape Transitions", TPT, Vol. 59, #7, Oct. 2021, p. 542.
  • Irany Vera Manrique, Gabriela Rivadeneyra Gutiérrez, and David Alejandro Martínez González, "Kinetic Friction: Time Upward and Downward", TPT, Vol. 57, #3, Mar. 2019, p. 142.
  • Chris Gaffney and Adam Catching, "Magnetic Viscous Drag for Friction Labs", TPT, Vol. 54, #6, Sept. 2016, p. 335. 
  • Said Shakerin, "Angle of Repose", TPT, Vol. 54, #3, Mar. 2016, p. 192.
  • Paul Hewitt, "Answer to October 2014 Figuring Physics Question", TPT, Vol. 52, #8, Nov. 2014, p. 501.
  • Subhranil De, "Revisiting the Least Force Required to Keep a Block from Sliding", TPT, Vol. 51, #4, Apr. 2013, p. 220.
  • Eric Dietz and Isaac Aguilar, "Slipping and Tipping: Measuring Static Friction with a Straightedge", TPT, Vol. 50, #8, Nov. 2012, p. 475.
  • Alae Kawan and Minjoon Kouh, "Wiimote Experiments: 3-D Inclined Plane Problem for Reinforcing the Vector Concept", TPT, Vol. 49, #8, Nov. 2011, p. 508.
  • Paul Hewitt, "Figuring Physics: Bucket on the Roof", TPT, Vol. 47, #7, Oct. 2009, p. 470.
  • Richard M. Heavers, "Why do Calculators Have Rubber Feet?", TPT, Vol. 45, #6, Sept. 2007, p. 373.
  • Kelly Deters, "An Inquiry Lab on Inclined Planes", TPT, Vol. 43, Mar. 2005, p. 177.
  • Richard P. McCall, "Variations on the Frictionless Inclined Plane Problem", TPT, Vol. 42, #4, Apr. 2004, p. 212.
  • Brian E. Martin and Martin Connors, "Testing a Model for Sliding Motion on an Incline", TPT, Vol. 41, #9, Dec. 2003, p. 534.
  • Paul Hewitt, "Figuring Physics: Normal Forces", TPT, Vol. 41, #9, Dec. 2003, p. 514.
  • Oscar Bollina and J. Rodrigo Parreira, "A Problem of Relative, Constrained Motion", TPT, Vol. 36, #6, Sept. 1998, p. 334.
  • Ed van der Berg and Cor van Huis, "Drawing Forces", TPT, Vol. 36, #4, Apr. 1998, p. 222.
  • Willard Sperry, "Placing the Forces on Free-Body Diagrams", TPT, Vol. 32, #6, Sept. 1994, p. 353.
  • Ronald Newburgh, "Force Diagrams: How? and Why?", TPT, Vol. 32, #6, Sept. 1994, p. 352.
  • Brian Lane, "Response to Mathot", TPT, Vol. 31, #7, Oct. 1993, p. 390.
  • Louis G. Mathot, "Free-Body Diagrams", TPT, Vol. 31, #7, Oct. 1993, p. 390.
  • Brian Lane, "Why Can't Physicists Draw FBD's?", TPT, Vol. 31, #4, Apr. 1993, p. 216.
  • James E. Court, "Free-Body Diagrams", TPT, Vol. 31, #2, Feb. 1993, p. 104.
  • Dennis Phillips, "Science Friction Adventure-Part II", TPT, Vol. 28, #8, Nov. 1990, p. 553.
  • Craig W. Smith and Kenneth D. West, "A Science Friction Adventure", TPT, Vol. 28, #5, May 1990, p. 301.
  • Margaret Stautberg Greenwood, "Inclined Plan on a Frictionless Surface", TPT, Vol. 28, #2, Feb. 1990, p. 110.
  • J. Serfinski, "Acceleration from The Energy Function Derivative", TPT, Vol. 26, #4, Apr. 1988, p. 228.
  • Roy Coleman and James Vokac, "High Friction", TPT, Vol. 22, #1, Jan. 1984, p. 46.
  • Lora Wilhite, "Good Lessons from Simple Machines", TPT, Vol. 16, #9, Dec. 1978, p. 645.
  • T. G. Bullen, C. F. C., "An Improved Inclined Plane for Introductory Physics", TPT, Vol. 7, #3, Mar. 1969, p. 167.
  • Thomas B. Greenslade, Jr., "Inclined Plane (Photo)", AJP, Vol. 70, #6, June 2002, p. 594.
  • William M. Wehrbein, "Frictional Forces on an Inclined Plane", AJP, Vol. 60, #1, Jan. 1992, p. 57.
  • "M-336: Angle of Repose", DICK and RAE Physics Demo Notebook.
  • Freier and Anderson, "Mk-4A", Demonstration Handbook for Physics.
  • Jearl Walker, "2.106, Sandpiles and Self-Organizing Flow", The Flying Circus of Physics Ed. 2, p. 128.
  • Julien Clinton Sprott, "1.9, Inclined Plane", Physics Demonstrations, ISBN 0-299-21580-6, p. 23.
  • Robert Ehrlich, "3.8, A Row of Magnetic Marbles on an Incline", Why Toast Lands Jelly-Side Down, p. 54.
  • Janice VanCleave, "Uphill", Guide to More of the Best Science Fair Projects, p. 132.
  • The Science House, North Carolina State University, "Friction and Shoes", Physics From the Junk Drawer, 3rd Edition, p. 15.
  • Borislaw Bilash II, “Relieving Tension“, A Demo A Day – A Year of Physical Science Demonstrations, p. 257.
  • Julius Sumner Miller, Q167 & A167, Millergrams II – Some More Enchanting Questions for Enquiring Minds, p. 40 & 96.

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.