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  • Welcome to Spring 2025!
  • Demo Highlight: Convection With High & Low Candles
  • Demonstration Highlight: Inertial Reference Frame
  • Demo Highlight: Ring and Disc on Inclined Plane
  • Demonstrations
  • New Resource: Directory of Simulations
  • New Resource: Demonstration Video Channel
  • Visit the UMD COVID-19 Dashboard
  • Physics is Phun: Flight

Welcome to 2025! We at the Lecture Demonstration Facility are looking forward to working with you in the spring semester.

We appreciate as much advance notice of demonstrations as you can give; but at a minimum, please remember to order your demonstrations before the order cutoff deadline: For morning classes, before 1PM the previous working day; for afternoon classes, before 4AM the day of the class. Where possible, we appreciate having the orders at least one full working day ahead, to ensure plenty of time to make sure everything is ready for you. As always, we’ll meet with you before your class to go over the demos and make sure everything is ready to be used effectively and safely.

Here's to a great semester!

The behaviour of gases as they're heated and cooled can be confusing, but is really important to understanding a lot of things in daily life, from the weather outside to heating a house to designing power plants... or simply to how candles burn. Demonstration I2-45: High & Low Candles in a Cylinder gives us an example of this.

 I2-45: Two small candles burn inside a clear plastic cylinder. One sits at table height, the other is elevated on a slim metal pedestal.

Read more on the Physics LecDem Blog!

 

 

Welcome back! Today we’re taking a look at a popular demonstration related to the concept of relativity.

 When we observe and measure motion, we are inevitably making the measurement against some frame of reference. An inertial reference frame is the technical term for a frame of reference in which an object is observed to have no outside forces acting on it, so that it is moving freely in space. Sometimes we have to go to great lengths to determine what such a frame of reference might be – and in the case of Demonstration P1-02, it is literally a metal frame!

 Demonstration P1-02: The Inertial Reference Frame, a large aluminum framework with a mounted winch to lift it.

Read more about this exciting demonstration and how it can be used in class in our latest blog post.

In recent years, the classic term “moment of inertia” has started to be largely retired in favor of the more descriptive “rotational inertia;” likely a good choice, as “moment” has long since ceased to have any non-time-related usage in everyday English. But call it what you will, it can be a challenging concept for beginning students to wrap their heads around.

Demonstration D2-01: Ring and Disc on Inclined Plane is a useful illustration for clarifying this concept. Two objects of similar mass and radius, a metal ring and a solid wooden disc, are placed on an inclined plane with no initial velocity. As they are accelerated by gravity, the disc quickly outpaces the ring. You can invite students to make a prediction ahead of time about their behaviour, presenting it as a race between the two objects, and invite them to discuss the results afterwards.

A wooden disc and a metal ring sit on a table next to a wooden ramp

Read more on our blog!

 

In support of most classes moving to an online model this year, the Lecture-Demonstration staff are doing our part to help connect you to resources you need for teaching remotely. As one part of this project, we have begun compiling a Directory of Simulations from around the internet, organized by general area of physics. Find it under the Tools and Resources menu above, or click the image below.

Sample subsection titles: Electricity & Magnetism Simulations, Mathematics Simulations, Optics Simulations, Oscillations & Waves Simulations, Quantum Simulations, Thermodynamics & Statistical Mechanics Simulations

There are a tremendous number of simulations out there, that folks have been creating for years. We’re testing them out, choosing ones that we can confirm currently work (always a question as internet technology marches on) and that seem useful for our department’s classes. As of this posting, we have just over fifty simulations collected. Our initial focus has been on physics that is hard to demonstrate in the classroom, or experiments that are difficult to present as static pictures or live video.

This project is ongoing! As we continue to explore we will be adding more subjects and more demonstrations per subject. We also invite recommendations! If you have a favourite simulation, let us know (email lecdemhelp at physics.umd.edu) so we can check it out and add it to the directory.

We’ll have more new projects posted soon; watch the site for news!

demovideospreviewmatrix1

In our ongoing work to support remote teaching, we are pleased to announce a new resource. Over the summer of 2020, a Teaching Innovation Grant helped to create our new Demonstration Videos. These can be used for remote, hybrid, and in-person classes to present demonstrations in conjunction with class engagement questions.

The videos have their own YouTube channel, linked both here and on the Tools & Resources Menu above; check them out today!

 

Science is all about data, and our current pandemic is no different. 

Be sure to check the UMD COVID-19 Dashboard for the latest campus data and links to reopening plans and  proper safety procedures.

Keep Terps Safe - UMD COVID Public Dashboard

 

The next Physics is Phun is coming down the runway!

Join us Friday, March 7th, and Saturday, March 8th, at 7:00 PM for Physics is Phun: The Physics of Flight! as we explore the physics of aerodynamics.

Please register using this form.

Physics is Phun Physics of Flight 2025

Article Index

How to place an order of demonstrations for your class or program:

Need some help placing an order of demonstrations for your class or program? Just follow these simple instructions.

 


Searching the Index

The first step to placing an order is determining which demonstrations you would like for your class or program. The index of demonstrations provides a listing of our available demonstrations and is accessible from the Demonstrations Services tab of the main menu.

Searching the Index

 


Alternate Ways to Find Demonstrations

The Lecture Demonstration Facility also offers a variety of alternative ways to find demonstrations by featuring popular demonstrations for particular classes  as well as weekly featured demonstrations. Below is an example showing demonstrations suggested to be used for PHYS161.

Alternate Ways to Find Demonstrations


The Demonstration Page

Clicking on read more will bring up the specific information page for the selected demonstration. This page will describe the demonstration as well as point out the availability of the demonstration. If you wish to order that demonstration, be sure to take note of the ID Code. It will be necessary in order to place a request for that demonstration.

The Demonstration Page

 

 


Placing an Order - Navigation

 

Once the demonstrations desired have been chosen, a request for those demonstrations can be placed by accessing the Place an Order  page from the Demonstration Services tab of the main menu.

Placing an Order - Navigation

 

 

 


Filling Out the Requisition Form - Necessary Information

 

The requisition form will prompt for a set of information regarding the logistics of the order. This includes contact information, date & time during which the demonstrations will be used, and analytic information that allows us to provide improved suggestions to teachers.

 

Filling Out the Requisition Form - Necessary Information Part 1

 

 

The date for your demonstration request, as well as desired delivery and return time, is required. Please note that all orders must be placed more than 24 hours (or greater for weekend requests) before desired delivery time.

Filling Out the Requisition Form - Necessary Information Part 2

 

 


Filling Out the Requisition Form - Demonstrations and Comments

 

Demonstrations and Comments are not required to be entered but are necessary to receive the desired demonstrations or supplementary materials. Up to 9 demonstrations can be placed in a single order. For more demonstrations, please enter a second order.

Filling Out the Requisition Form - Demonstrations and Comments

 

 

 

 


The Confirmation Email

 

Upon successful submission of an order, a confirmation email will be sent to the address provided. This email will include the information submitted as well as links back to index pages of the requested demos. Please take this opportunity to confirm that the desired demonstrations correspond to the demonstrations requested in the form.

The Confirmation Email

 

Clicking on one of the confirmation links will bring up its corresponding index page

 

Old Index Link

 

 


Viewing a Calendar of the Orders

 

A calendar view of all orders placed on a given week can be viewed from the Requested Demonstrations page  accessible from the Demonstration Services tab of the main menu. Clicking on an order from the calendar will bring up more detailed information about that request including the specific demonstrations requested and any comments included in the form.

Viewing a Calendar of the Orders