Lect03 - Physics 215 Physics for Elementary Education...

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Physics 215 Physics for Elementary Education Instructor: Dr. Mark Haugan Office: PHYS 282 haugan@purdue.edu TA: Mayra Cervantes Office: PHYS 222 mcervant@purdue.edu TA: Jordan Kendall Office: PHYS 222 kendallj@purdue.edu TA: Daniel Whitenack Office: PHYS 136 dwhitena@purdue.edu Office Hours: If you have questions, just email us to make an appointment. We enjoy talking about teaching and learning physics! Notices: The department’s I-Clicker problems have been resolved. I will post scores from today’s questions by Friday. Please check CHIP to verify that your scores have been recorded so we are certain that things really are working correctly now.
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Interactions and Energy The laboratory activities of chapter 1 have you examine examples of interactions between objects. In each example, an interaction is signaled by changes in the objects involved. For example, in the activities in which you’ve examined interactions between a cart and other objects changes in the cart’s speed signaled that the cart was interacting with the other objects. This graph displays evidence that the cart whose velocity was measured interacted with something (someone’s hand?) during the time interval between 1 and 1.5 seconds. The cart’s speed increased rapidly during that interval. We’ve been learning to think of what is happening during an interaction between objects as a transfer of energy between them.
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In more recent activities you’ve considered other kinds of changes in objects which signal that they have interacted with something else. Q1. Which of the following are changes in objects that you’ve have used in recent lab activities to identify whether the objects have interacted with something else? A) change of speed B) change of shape C) change of temperature D) A and C E) A, B and C * A change of speed is associated with a change of an object’s kinetic energy so mechanical energy must have been transferred to or from the object by an interaction with another object. A change of shape of an elastic object or a living object is associated with a change of the object’s internal elastic or chemical (potential) energy so mechanical energy must have been transferred to or from the object by an interaction with another object.
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This note was uploaded on 04/23/2011 for the course PHYS 215 taught by Professor Unknown during the Spring '11 term at Purdue University-West Lafayette.

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Lect03 - Physics 215 Physics for Elementary Education...

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