33%(3)1 out of 3 people found this document helpful
This preview shows page 1 - 3 out of 7 pages.
UDel Physics1 of 7Fall 2016PHSY207 Lab 2 – Vectors Instructional Goals: Goals: Hands-on practice using vectors: oConverting between magnitude and direction to unit vectors and vice-versa. oVector addition. Introduction to Newton’s first law of motion. What You Turn In: Turn in the Pre Lab portion of this lab within the first five minutes of your lab start time. A complete apparatus sketch, description and procedure. Your data table and calculations and accompanying diagrams. Background Reading:Background reading for this lab can be found in HRW 10e Chapter 3 and sections 5-1 through 5-2. Equipment provided by the lab:Force Table with four pulleys Small ring with four attached strings Four weight hangers Set of masses Protractors Paper to draw vectors Equipment provided by the student:Bound notebook with quadrille (graph paper) pages. Ruler Pen Calculator USB memory device for taking computerized data from the lab (or alternatively email the data to yourself). Background:When describing physical quantities we use different mathematical structures. The first is a scalar. A scalar is simply a quantity with units. Examples of this are mass (SI unit –kilogram), temperature (SI unit –Kelvin), time (SI unit –second), etc. Another way to describe a physical quantity is by using a vector. A vector is a scalar associated with a direction. An example is displacement, which is distance and the direction associated with it. Think of where the door is Figure 1 - Apparatus Setup
PHYS207 Lab 2 Vectors UDel Physics2 of 7Fall 2016relative to where you are now. The door is some distance away (a scalar value) and in a particular direction. If someone were to ask you how to get to the Trabant Student Center from the front door of Sharp Lab, a complete description would not be distance or direction only, but the distance and direction. In fact, it may be a series of distances and directions added together. This is a unique point. Any place in space can be represented as a vector displacement from any other point. As an example, where is the Perkins Student Center from Sharp Lab? It is ~ 500 m, 60° South of East. However, it is easy to see that we cannot walk directly there on the straight line that is the displacement vector, so we must take another route. Let us ask Google® maps (Figure 3 and Figure 4) to make us a walking route by specifying the front door of Sharp Lab as our starting point and the Academy St entrance to the Perkins Student Center as our end. Now you need to give a direction and a distance, this is known as a displacement. 1. Head south go 48 m 2. Turn left go 120 m 3. Turn left go 190 m 4. Slight left go 160 m 5. Turn right go 55 m Total: 550 m Notice how each of these is a direction and distance.