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Gizmo Week 6: Penumbra Effect Gizmo

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Week 6 Online Lab: Penumbra Effect Gizmo Explore Learning Gizmo: Penumbra Effect For this assignment, you'll use a Gizmo at the Explore Learning web site. Before you begin: • Be sure you h ... ave read the assigned reading for the week. • You may want to print this document so that you can note observations as you work with the gizmo. Later, you can type your answers into the Word document and upload it with this assignment form. • All questions to answer are contained in this document. You don’t need to answer any questions at the Explore Learning site. • This lab has a Prior Knowledge piece, a Warm-Up piece, and Activity on Light Gradation. • You must answer in a different colored font (-1 point) FINDING THE GIZMO Follow these steps to find the Gizmo: • Go to the Explore Learning website: http://www.explorelearning.com/. • If you have not yet enrolled in the class -- In the upper right hand corner, click on Enroll in a Class. • The class code you need is 6FZRUV6SEM (note - these are all capital letters). • Click on Continue. • If you have used the Explore Learning site before you should be able to log in using your MNOHS username and password (for example, mnohs10ajones / piano227). If you have never used Explore Learning before, you’ll need to register using your MNOHS username and password with the class code. In other words, the class code is only needed once! • Once inside the Physics course, look for the Gizmo called Penumbra Effect and click on Launch Gizmo. Vocabulary: eclipse, penumbra, point source, umbra Prior Knowledge Questions (Do these BEFORE using the Gizmo.) Try this experiment: Shine a flashlight (or a desk lamp) on your hand so that it casts a shadow on a sheet of white paper. Hold your hand about 15–30 cm (6–12 inches) above the paper. 1. Look at the edges of the shadow. Are they sharp or fuzzy? They are fuzzy 2. Move your hand up and down. How does this affect the fuzziness of the shadow? The closer it gets the more fuzzy 3. Why do you think the shadow has fuzzy edges? The light sources are obstructed and by objects and appear fuzzy Gizmo Warm-up The fuzzy edge of a shadow is the penumbra, a region where light is only partially blocked. The Penumbra Effect Gizmo™ demonstrates why penumbras form. To begin, check that the Number of lights is 1. Click the light to turn it on. The gray block casts a shadow. 1. The light is a point source, which means that all of the light rays emanate from a single point. Does the resulting shadow have sharp or fuzzy edges? It has a clear defined shadow 2. Increase the Number of lights to 2. How does this affect the shadow? It starts to become fuzzy 3. The central, dark part of the shadow is the umbra. Would you be able to see either of the lights if you were standing in the umbra? Explain. You would not be able to see the light if you were standing directly behind because the object making a shadow would block it out YY [Show More]

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