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  • Publicado : 26 de abril de 2011
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Welcome to Working Model
Working Model is the result of a 15-year collaborative effort between professional engineers and software specialists. We are committed to providing you easy-to-use, engineering software that makes you more productive, and saves time and money on hardware prototyping, testing, and virtual product development. To begin, install Working Model and go through each step ofthe demonstration described below.

Installing Working Model
1. Insert the Working Model CD into the CD-Rom drive and follow the installation instructions 2. When prompted for a serial number, enter “DEMO” or enter your licensed serial number

3. When the “Choose Folder” window appears, click [OK]. 4. For a step-by-step introductory tutorial, turn to the next page. Phone: 650.381.3395 or 800.766.6615 Fax: 650.574.7541

Starting Working Model
1. Ensure that Working Model is installed on your computer. 2. From the Windows Menu, click on Programs, then Working Model, and then Working Model. This opens a simulation.

4 Graphing the Pendulum’s Motion
1. To graph the pendulum’s motion, click on the rectangle. Under the Measure menu, select Position,then select Rotation Graph. . Note: Data can be displayed as a graph, bar chart, 2. To collect data, click or number, and can be changed while running the simulation. Click . 3. The graph shows the pendulum’s amplitude and frequency. To make the graph larger, click on the graph and drag its lower right-hand corner to the right.

1 Creating a Falling Block
1. The first simulation is Newton’s firstexperiment, dropping a block. 2. To draw a rectangle, click on the Rectangle tool, then click in the workspace and draw a long thin rectangular block. . 3. To run the simulation and see the block fall due to gravity, click 4. Click to reset the simulation.

5 Changing Gravity
1. To change gravity, click on the World menu, select Gravity, type the value 20 2 m/sec in the input box, and click[OK]. and observe that, in agreement with theoretical and experimental 2. Click predictions, the pendulum has a higher natural frequency. Click .
Note: Working Model was designed to be easy-to-use. For example, in this exercise, the only time you need to touch the keyboard is to enter the value 20.

2 Adding a Velocity Vector
1. To add a velocity vector, click on the rectangle. 2. From theDefine menu, click on Vectors and then Velocity. and observe that the vector changes magnitude as the block falls. 3. Click 4. Click . Optional: To add a numerical value to the velocity vector (or its components), click on the Define menu, select Vector Display, and check the Value box.

3 Making a Pendulum
1. To make a pendulum, click on the Pin joint tool and then click on the upper lefthandcorner of the rectangle. and observe that the vector changes magnitude and direction as the 2. Click pendulum moves. Click .

6 Adding Air Resistance
1. Under the World menu, select Air Resistance, click on Low Speed, and accept the default air resistance value of 0.3 kg/(m*s) by clicking [OK]. and observe the exponentially decaying oscillations. Click . 2. Click


7 Adding a Spring
1. Toadd a spring, click on the Spring tool. Click on the upper right-hand corner of the block and stretch the spring up and to the right. and observe the pendulum’s higher natural frequency and new 2. Click equilibrium position. Click .

9 Collisions with a Smooth Polygon
1. To create a smooth polygon, click on the Curved Polygon tool, click in the workspace in a few locations. Double-click to closethe polygon. (If your rectangle is to zoom to extents.) high on the screen, click 2. Click to start the simulation and observe that the curved polygon bounces and rolls on top of the rectangle. Automatic collision and contact is a very useful feature in Working Model (even the elastic and frictional properties of objects may . be varied). Click

8 Controlling the Spring Constant
1. To control...