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## PHYS 2460-02 Weeks 1&2

by: Kristianna Notetaker

28

0

4

# PHYS 2460-02 Weeks 1&2 PHY 2460 - 02

Kristianna Notetaker
WSU

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These notes cover position and beginning of motion.
COURSE
Concepts in Physics for Middle Childhood Education
PROF.
Joseph Childers
TYPE
Class Notes
PAGES
4
WORDS
CONCEPTS
Physics, motion, position, Math
KARMA
25 ?

## Popular in Education, Physics

This 4 page Class Notes was uploaded by Kristianna Notetaker on Sunday September 11, 2016. The Class Notes belongs to PHY 2460 - 02 at Wright State University taught by Joseph Childers in Fall 2016. Since its upload, it has received 28 views. For similar materials see Concepts in Physics for Middle Childhood Education in Education, Physics at Wright State University.

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Date Created: 09/11/16
• Physics is an experimental science o Perform observations of natural world o Make explanations for its properties and behaviors o Express these explanations mathematically o Test and refine explanations 1) The universe behaves predictably 2) The Scientific Method OBSERVATION FIND A PATTERN BUILD ON HYPOTHESIS DEVELOP A HYPOTHESIS YES WAS THE PREDICTION RIGHT OR WRONG? MAKE A TESTABLE PREDICTION NO DO THE TEST REVISE OR REJECT IT • Motion is a change in position over time o What is position? • Reference Frame o Origin – a designated “center” spot o Coordinate axes – designated directions o Time zero Hypothesis Prediction • Explanation of some sort • If… Then • Based on an underlying mechanism • Conditional • Something you can test • Index: Something per something else (ex: mi/hr) (DIVISION) SOMETHING SOMETHING ELSE • Physical Quantity: something in the world that can be observed and measured o Ex: distance, height, weight • Units: how you describe that measurement o Ex: meters, inches, light years, etc. Example: Physical quantity: height Units: inches, centimeters, feet • t is time • x is position *position is NOT distance • Delta (Δ) means “change in” or “interval” o Δt : change in time, time interval o Δx : change in position, “displacement” • Speed = distance/time = (dist)/ Δt • Velocity = displacement/time = Δx/ Δt **DISPLACEMENT IS NOT DISTANCE Equations: Δt = t 2 t 1 Δx = x –2x 1 (t NOW – tBEFORE ) (Position Now –Position Before) v = Δx/ Δt Example: t x Δt Δx v 0 0 - - - 1 4 1-0=1 4-0=4 4/1=4 2 8 2-1=0 8-4=4 4/1=4 3 12 3-2=1 12-8=4 4 4 16 4-3=1 16-12=4 4 5 20 5-4=1 20-16=4 4 • Independent Variable o On horizontal axis o Choose this arbitrarily • Dependent Variable o On vertical axis o Calculate from or observe the independent variable • Constant Velocity Example: x(t) = 0 +4t o x(t) = x + 0t x(1) = 0+41 =4 x(4) = 0 + 44 =16 x(100) = 0 + 4100 =400 Constant Velocity Equations à word problem key terms x = x 0+ vt à position where; at what spot; how far x 0= x-vt à starting position; where was it at; t=0 v = x – x /0 à how fast t = x – x 0v à when; how long

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