chapter2

chapter2 - Chapter 2 Motion in One Dimension Kinematics...

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Chapter 2 Motion in One Dimension
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Kinematics Describes motion while ignoring the external agents that might have caused or modified the motion For now, will consider motion in one dimension ± Along a straight line 0RWLRQ UHSUHVHQWV D FRQWLQXDO FKDQJH LQ DQ REMHFW¶V SRVLWLRQ± Introduction
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Types of Motion Translational ± An example is a car traveling on a highway. Rotational ± $Q H[DPSOH LV WKH (DUWK¶V VSLQ RQ LWV D[LV± Vibrational ± An example is the back-and-forth movement of a pendulum. Introduction
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Particle Model We will use the particle model. ± A particle is a point-like object; has mass but infinitesimal size Introduction
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Position 7KH REMHFW¶V SRVLWLRQ LV LWV ORFDWLRQ ZLWK respect to a chosen reference point. ± Consider the point to be the origin of a coordinate system. 2QO\ LQWHUHVWHG LQ WKH FDU¶V WUDQVODWLRQDO motion, so model as a particle Section 2.1
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Position-Time Graph The position-time graph shows the motion of the particle (car). The smooth curve is a guess as to what happened between the data points. Section 2.1
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Motion of Car Note the relationship between the position of the car and the points on the graph Compare the different representations of the motion
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Data Table The table gives the actual data collected during the motion of the object (car). Positive is defined as being to the right. Section 2.1
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Representations of the Motion of Car Various representations include: ± Pictorial ± Graphical ± Tablular ± Mathematical ± The goal in many problems Using alternative representations is often an excellent strategy for understanding the situation of a given problem. ± For example, compare the different representations of the motion. Section 2.1
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Alternative Representations Using alternative representations is often an excellent strategy for understanding a problem. ± For example, the car problem used multiple representations. ± Pictorial representation ± Graphical representation ± Tabular representation Goal is often a mathematical representation Section 2.1
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Displacement Displacement is defined as the change in position during some time interval. ± Represented as ' x ' x Ł x f - x i ± SI units are meters (m) ± ' x can be positive or negative Different than distance ± Distance is the length of a path followed by a particle. Section 2.1
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Distance vs. Displacement ± An Example Assume a player moves from one end of the court to the other and back. Distance is twice the length of the court ± Distance is always positive Displacement is zero ± ǻ x = x f ± x i = 0 since x f = x i Section 2.1
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Vectors and Scalars Vector quantities need both magnitude (size or numerical value) and direction to completely describe them. ± Will use + and ± signs to indicate vector directions in this chapter Scalar quantities are completely described by magnitude only.
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chapter2 - Chapter 2 Motion in One Dimension Kinematics...

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