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Chapter 2

PHY1331 Chapter 2: Chapter 2 Textbook Notes


Department
Physics
Course Code
PHY 1331
Professor
Selahattin Celebi
Chapter
2

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PHY1331 – Chapter 2 Textbook Notes
Position
- location in relation to a reference point (origin)
- we can determine motion from position
Different Methods of Displaying Information
- pictorial representation
- graphical representation (ex. position-time graph)
- tabular representation
- mathematical representation
Displacement Δx = change in position over a period of time, can be positive or
negative value
Δx = (xf – xi) This is the equation and represents the Δx as being the difference
between the final position (xf) and initial position (xi)
Distance = different from displacement and is known as being the length of path,
can only be a positive value
Vector Quantity = direction and a magnitude
Scalar Quantity = numerical value with no direction
Average Velocity
- dimensional analysis is L/T
- SI units are m/s
- Can be either a positive or negative value due to the nature of Δx
- Equation is vavg = Δx/Δt where Δx is the displacement and the Δt is the time
interval and can only be positive
Average Speed
- SI units are m/s
- Can only be a positive value and has no direction
- Equation is vavg = d/Δt where the total distance d is divided by the time
interval
Example 2.1. Find displacement & average velocity
Given Values
XA = 30m
XF = -53m
TA = 0s
TF = 50s
Displacement Equation
ΔX = XF - XA
ΔX= -53m – 30m = -83m
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