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Physics Principles and Problems

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Presentation on theme: "Physics Principles and Problems"— Presentation transcript:

1 Physics Principles and Problems
Representing Motion Chapter 2 Physics Principles and Problems Zitzewitz, Elliot, Haase, Harper, Herzog, Nelson, Nelson, Schuler and Zorn McGraw Hill, 2005

2 Motion An object whose position changes over time.
Motion Diagram - shows the positions of a moving object at successive times.

3 Visualizing Motion Coordinate System - shows the location of the zero point (origin) and direction of an object in motion. Arrows can be utilized to show an objects position and distance traveled.

4 Vectors and Scalars Vectors are quantities that have both magnitude (size) and direction. 0 15m Scalars are quantities that are numbers without direction 4C, 5m, 39s, 22m/s

5 Resultant Vectors Vector that represents the sum of two or more vectors. Based upon their direction some vectors can be negative.

6 Time Intervals and Displacement
Time Interval - equals the final time (tf) minus the initial time (ti) ∆ t = tf - ti Displacement - equals the final position (df) minus the initial position (di) ∆ d = df - di

7 Position - Time Graphs By plotting the time (t) and position (d) data of a particular object a position-time graph can be generated. Remember that d represents that object’s instantaneous position. t d 30 0 55 0

8 Average Velocity v = ∆d / ∆t = df - di / tf - ti
Defined as the change in position divided by the time during which the change occurred. v = ∆d / ∆t = df - di / tf - ti Average velocity is represented by the slope of the line in a position-time graph

9 Speed vs. Velocity Speed is how fast an object in moving. It is a scalar quantity and therefore can never be negative. Velocity is speed with direction. It is a vector quantity and therefore can be negative. Instantaneous velocity is the speed and direction of an object at a particular instant.

10 Equation of Motion for Average Velocity
An object’s position is equal to the average velocity multiplied by time plus the initial position. d = vt + di Use algebra and the equation v = d / t to solve for any of the variables.

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