Lect09

# Lect09 - Physics 215 Physics for Elementary Education...

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Physics 215 Physics for Elementary Education Instructor: Dr. Mark Haugan Office: PHYS 282 [email protected] TA: Mayra Cervantes Office: PHYS 222 [email protected] TA: Jordan Kendall Office: PHYS 222 [email protected] TA: Daniel Whitenack Office: PHYS 136 [email protected] Office Hours: If you have questions, just email us to make an appointment. We enjoy talking about teaching and learning physics! Notices: Grades for the midterm exam, clicker points, … are all being updated in CHIP now that staff are back from spring break, so, you can check them out.

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Magnetic, Electric and Gravitational Interactions and Forces During the lab sessions just before spring break you used our BIG IDEAS , An object moves in a straight line at a steady speed when it is moving freely, that is when no object in its surroundings exerts a force on it. and Rate of change of an object’s speed ~ Strength of force on the object , Mass of the object to discover some things about three kinds of non-contact interactions. The text presents them as three different kinds of interactions because, as you saw, the forces that magnets exert on each other and on unmagnetized objects are quite different from the forces charged objects exert on each other and on uncharged objects and both are quite different from the gravitational forces that massive objects exert on each other. Let’s consider some of these differences …
N S N S B2 N S N S The forces that two magnets exert on each other depend on how they are oriented relative to each other. For example, attractive forces repulsive forces The forces that two like-charged objects exert on each other are always repulsive. The forces that two oppositely-charged objects exert on each other are always attractive. The gravitational forces that two massive, uncharged, non-magnetic objects exert on each other are always attractive.

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Despite these differences, we found that we could use our energy-based ideas to understand situations in which all of these new kinds of interactions act. Q1. These carts are at rest, stuck together when a student gives that the cart without the extra mass a strong tap so that it begins to move away from the other cart. Because of the extra mass on the other cart, it hardly moves as time passes. What is the energy-based explanation of why the lighter cart slows down as it moves further away from the other cart? Assume friction is neglibible.
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