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Exam 2 Review

by: Kristianna Notetaker

Exam 2 Review PHY 2460 - 02

Kristianna Notetaker

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About this Document

This review will cover most of what is on Exam 2.
Concepts in Physics for Middle Childhood Education
Joseph Childers
Study Guide
Math, Physics, acceleration, velocity, displacement
50 ?




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This 4 page Study Guide was uploaded by Kristianna Notetaker on Sunday October 16, 2016. The Study Guide belongs to PHY 2460 - 02 at Wright State University taught by Joseph Childers in Fall 2016. Since its upload, it has received 7 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: 10/16/16
• Key Equations: o Δt = t 2t 1 o Δv = v -2 1 o Velocity: v = Δx/Δt o Acceleration: a = Δv/Δt o v = v 0 at § v0 = v – at § a = v – v /t 0 § t = v – 0 /a o Displacement: Δx = (v)(Δt) o Area (square)= base(b)Ÿheight(h) o Area (triangle) 1/2bh o Area (trapezoid) 1/2bh (b 1 b )2 o To find position with acceleration: x = x + v0t +0½at 2 § x by itself: x = x – v t – ½at 0 0 0 2 § v0 by itself: 0 = (x –0x – ½at ) / t 2 § a by itself: a = [ 2(x –0x –0v t) ] / t 2 § t by itself: ( 0v ±√[0 – 2a(x0 – x)] ) / a o t = √( [2(x – x )0 / a ) *only when v =00 o Find position with no acceleration: x = x + v0 o Find velocity with constant acceleration: v = v + at0 o speed = |velocity| • Velocity vs. Time Graph o Straight horizontal line means “constant velocity” o straight sloped line means “constant acceleration” • Position vs. Time Graph o Straight horizontal line means “at rest” o Straight sloped line means “constant velocity” • Dot Diagrams o One dot per unit o Each dot shows position at that time o Motion diagrams include velocity arrows between dots • Change in velocity arrows for motion diagram o Have a current and previous arrow o Make a copy of previous arrow § To scale § Tail-to-tail with current arrow o The Δv arrow goes from head of copy to head of current • Finding Acceleration o Data Table Way o Acceleration Equation • “Falling” o velocity: speed is increasing; direction o acceleration: constant o position: downward; if up positive, decreasing if up negative, increasing Graph A: Graph B: Graph C: Graph D: ACCELERATION positive negative Graph C Graph A v Speeding Up Slowing Down p L Graph B Graph D V n Slowing Down Speeding Up • Displacement o Area between V. curve and t axis o Δx = (v)(Δt) Practice Problems: 1. If at 0 seconds, a truck is moving at 10mph and is at 30mph 10 seconds later, what is the acceleration of the car? 2. A car starts at 5mph and accelerates at a rate of 3mph/s. How long does it take to get at 30mph? 3. A Porsche starting at time zero is going 5mph. At 3 seconds it was traveling at 60mph. What is the acceleration of the car? 4. A taxi’s current speed is 35mph after 30 seconds and accelerating at 1mph/s. What is its origin? 5. A Lamborghini’s final velocity is 120mph. Over a 5 second period the car accelerated 20mph/s. What was the car’s initial velocity? 6. A bike starting at its garage (origin) starts at a speed of 2m/s. After 10 seconds, the bike reached the stop sign 24m away. What is the acceleration of the bike? 7. What is the displacement over 3 seconds? 10m/s 1 2 3 8. A bus is stopped at a red light. Once the light turns green, the bus accelerates at 2m/s . How long will it take the bus to reach 10 meters? 9. A tractor starts at 20mph. It accelerates at a rate of 2mph. It started at the origin and ended at 30 miles in the positive direction. How long did it take the car to get to 30 miles? 10. A bike starting at the origin is traveling at 5m/s. Accelerating at 0.2m/s , 2 where would the car be after 2 seconds? Review Question Answer Key: 1. 2 mph/s 2. 8.33 seconds 3. 18.33 mph/s 4. 5 mph 5. 20 mph 6. 2 m/s 2 7. 30 meters 8. 2.23 seconds 9. 1.402 hours 10. 10.4 meters


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