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published by the UCLA Department of Physics and Astronomy
written by Martin Simon
This item is an interactive lecture demonstration (ILD) that helps students understand the Law of Inertia as it relates to circular motion.  It features a pie plate with a wedge cut out.  A metal ball is then spun around the rim of the plate.  The inward force of the rim keeps the ball in circular motion until the rim ends, when the ball flies off in a straight line, obeying Newton's First Law.  The action is animated to clearly illustrate how the demonstration should appear in the physics classroom.  

This item is part of a much larger collection of multimedia teaching resources which includes a database of ILD's, simulations, and video clips, compiled by the UCLA Department of Physics and Astronomy.  SEE RELATED ITEMS BELOW for a link to the full collection.

Please note that this resource requires Java Applet Plug-in, or Flash.
Subjects Levels Resource Types
Classical Mechanics
- Newton's First Law
Education Practices
- Active Learning
= Interactive Lecture Demonstration
- High School
- Lower Undergraduate
- Instructional Material
= Demonstration
- Audio/Visual
= Movie/Animation
Appropriate Courses Categories Ratings
- Physical Science
- Physics First
- Conceptual Physics
- Algebra-based Physics
- AP Physics
- Activity
- Laboratory
- New teachers
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Intended Users:
Learner
Educator
Formats:
image/gif
text/html
Access Rights:
Free access
Restriction:
© 2003 UCLA Physics and Astronomy, 2003.
Keywords:
ILD, Law of Inertia, Newton's First Law, animation, centripetal force, circular motion, demonstration, inertia, lecture demonstration, mass, tangential velocity
Record Cloner:
Metadata instance created January 8, 2009 by Caroline Hall
Record Updated:
March 12, 2014 by Caroline Hall
Last Update
when Cataloged:
September 3, 2007

AAAS Benchmark Alignments (2008 Version)

4. The Physical Setting

4F. Motion
  • 6-8: 4F/M3a. An unbalanced force acting on an object changes its speed or direction of motion, or both.
  • 6-8: 4F/M3b. If a force acts towards a single center, the object's path may curve into an orbit around the center.

Next Generation Science Standards

Disciplinary Core Ideas (K-12)

Forces and Motion (PS2.A)
  • The motion of an object is determined by the sum of the forces acting on it; if the total force on the object is not zero, its motion will change. The greater the mass of the object, the greater the force needed to achieve the same change in motion. For any given object, a larger force causes a larger change in motion. (6-8)

This resource is part of a Physics Front Topical Unit.


Topic: Dynamics: Forces and Motion
Unit Title: Newton's First Law & Inertia

What would happen if an object in circular motion suddenly loses its net centripetal force?  Teachers can easily set up this demo to show students that Newton's Law of Inertia will govern the situation, and the object will fly off in a straight line tangential to the circular path.  Pair this item with the animation below titled "Physlets In-Class Exercises-Circular Motion".

Link to Unit:
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Record Link
AIP Format
M. Simon, (UCLA Department of Physics and Astronomy, Los Angeles, 2003), WWW Document, (http://www.physics.ucla.edu/demoweb/demomanual/mechanics/first_law_inertia/partial_pie_plate.html).
AJP/PRST-PER
M. Simon, UCLA Instructional Resource Lab: Partial Pie Plate (UCLA Department of Physics and Astronomy, Los Angeles, 2003), <http://www.physics.ucla.edu/demoweb/demomanual/mechanics/first_law_inertia/partial_pie_plate.html>.
APA Format
Simon, M. (2007, September 3). UCLA Instructional Resource Lab: Partial Pie Plate. Retrieved September 1, 2014, from UCLA Department of Physics and Astronomy: http://www.physics.ucla.edu/demoweb/demomanual/mechanics/first_law_inertia/partial_pie_plate.html
Chicago Format
Simon, Martin. UCLA Instructional Resource Lab: Partial Pie Plate. Los Angeles: UCLA Department of Physics and Astronomy, September 3, 2007. http://www.physics.ucla.edu/demoweb/demomanual/mechanics/first_law_inertia/partial_pie_plate.html (accessed 1 September 2014).
MLA Format
Simon, Martin. UCLA Instructional Resource Lab: Partial Pie Plate. Los Angeles: UCLA Department of Physics and Astronomy, 2003. 3 Sep. 2007. 1 Sep. 2014 <http://www.physics.ucla.edu/demoweb/demomanual/mechanics/first_law_inertia/partial_pie_plate.html>.
BibTeX Export Format
@misc{ Author = "Martin Simon", Title = {UCLA Instructional Resource Lab: Partial Pie Plate}, Publisher = {UCLA Department of Physics and Astronomy}, Volume = {2014}, Number = {1 September 2014}, Month = {September 3, 2007}, Year = {2003} }
Refer Export Format

%A Martin Simon
%T UCLA Instructional Resource Lab:  Partial Pie Plate
%D September 3, 2007
%I UCLA Department of Physics and Astronomy
%C Los Angeles
%U http://www.physics.ucla.edu/demoweb/demomanual/mechanics/first_law_inertia/partial_pie_plate.html
%O image/gif

EndNote Export Format

%0 Electronic Source
%A Simon, Martin
%D September 3, 2007
%T UCLA Instructional Resource Lab:  Partial Pie Plate
%I UCLA Department of Physics and Astronomy
%V 2014
%N 1 September 2014
%8 September 3, 2007
%9 image/gif
%U http://www.physics.ucla.edu/demoweb/demomanual/mechanics/first_law_inertia/partial_pie_plate.html


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Is Part Of UCLA Physics and Astronomy Instructional Resource Lab

This is the portal for the UCLA Instructional Resource Lab, containing links to the ILD's, video clips, simulations, and other multimedia resources for physics and astronomy education.

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