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PHYS 1P21 (33)
Chapter 1

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Brock University
Santo D' Agostino

Section 1.1: Motion, a First Look 2 step process to solve motion problems: 1. Motion Diagram: Develop a simplified representation of motion so that the key elements stand out. 2. Analyze the motion with the language of mathematics. Motion: the change of an object's position or orientation with time. Trajectory: the path along which an object moves. 4 basic types of motion: 1. Straight-line motion (1 dimensional) 2. Projectile motion 3. Circular motion 4. Rotational motion Section 1.2: Position and Time, Putting Numbers on Nature Displacement: the difference between a final position (x ) and an inifial position (x or x ). i 0 Δx = x -f (iositive or negative) Time Interval: change in time. A time interval (Δt) measures the elapsed time as an object moves from an initial position (x) at time t , to a final position (x ) at time t . i i f f Δt = t fti(always positive: t>t ) f i Section 1.3: Velocity Uniform motion (definition): motion at a constant speed. For an object in uniform motion, successive frames of the motion diagram are equally spaced. This means that the object's displacement (Δx) is the same between successive frames. Speed of a moving object = distance traveled in a given time interval/ ti
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