## URM Test

We have been working through the Uniform Rectilinear Motion (URM) unit. Here is a summary of what you are responsible for in this unit:

 # Objective Need help? Use these video lessons! 1 Add vectors using the component method Intro to Vectors, Representing Vectors, Vector Addition – Components 2 Add vectors using the graphical method Intro to Vectors, Representing Vectors, Vector Addition – Example, Vector Addition – Graphical 3 Choose a reference system suited to the situation Frames of Reference 4 Solve uniform rectilinear motion problems (using Δd = vΔt) Vector Addition – Graphical, Vector Addition – Components, Uniform Motion 5 Differentiate between displacement and distance Position Displacement and Distance, Uniform Motion 6 Draw and interpret diagrams to represent the motion of an object moving with a constant velocity Graphing Position

You will be given the URM equation on your test:

$V_{av}=\frac{\Delta&space;d}{\Delta&space;t}$

(Note that last year’s exam formula sheet is stored in Sakai Resources > Useful Documents).

## Vector Addition Force Table Lab

The purpose of the Force Table lab is to practice vector addition using the graphical method and the components method.

Just as a reminder for the Force Table lab, you need the following equipment:

• circular force table (or a stiff round tray such as a pizza plate, 30 – 50cm in diameter, as shown in the set-up video)
• a scale/balance to measure the mass of the masses in g or kg
• three equal masses (can be a standard mass or something small like a D-cell battery)
• three pieces of string (approx 30 cm long)
• if using a round tray, you will also need a stool or something similar to support the plate and allow the masses to hang freely
• geometry set (protractor and ruler)
• pencil, eraser
• two sheets of paper (per student)

If there are mutiple students at your school, you can easily share the equipment. You will, however, need to create your own individual drawings.

In preparation for tomorrow’s Force Table lab, I have put together a few short videos.

Here is the set-up:

http://video.videolicious.com/07994fb9-ecd9-4da1-9230-d0f4360530d1

Here is the procedure:

http://video.videolicious.com/5fd9722d-7cc1-48b9-8bb0-b0dbf21c8911

Here is some information on the calculations you will be performing for the lab:

For those of you who are using a force table, this video by Mr. Ross demonstrates the set-up:

Rubric (click on the image to enlarge it):

Analysis:

1. Use a scale diagram to determine the resultant force of the system (graphical method).
2. Use the components method to determine the resultant force of the system.
4. Which vector addition method did you find easier? Why?

## Hello Class!

Welcome to the CulePhys blog. We will be working here from time to time.

In this course, we will be covering:

• How things move (URM/UARM motion)
• How forces affect an object’s movement (Dynamics/Forces)
• How energy changes when an object moves or how energy changes affect an object’s movement (Energy)
• How light is reflected or refracted (Reflection/Refraction)

Please add a comment to share ONE THING that you wonder about relating to any of the above topics.