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Exam 1 Study Guide — PHYS 121 — Spring 2019 — Dr. Goolsby-Cole • The seating ch

Exam 1 Study Guide — PHYS 121 — Spring 2019 — Dr. Goolsby-Cole • The seating chart and room assignment for the exam are posted on Blackboard under the Course Materials tab — make sure you know where your room is before the day of the exam. If you arrive late, you will not be given extra time. • SDS Students: You must inform SDS that you will be taking the exam with them at least two days before the exam is scheduled. Also, since SDS opens at 8:30 AM on Friday, that is when you must sign up to take it. • There are past exams posted on Blackboard under the Course Materials tab. • You are allowed a calculator, but no sharing of calculators. • Cellphones or any other electronic devices are forbidden. • One 3’’ x 5’’ index card is allowed with anything written on it, back and front. • Your work must be legible and clearly written. Messy or indecipherable work may receive no credit. • For multiple choice questions, no work is required and no partial credit will be given. • For free-response questions, you must show your work in order to receive credit. A correct answer with no supporting work will receive no credit, while a wrong answer with supporting work might receive partial credit. • Give numerical results to two signiﬁcant ﬁgures with appropriate units. Complete the arithmetic for full credit. — Exam 1 covers material from FlipIt Physics Units 1-3. From the textbook, it will cover Chapter 1 Sections 6-7; Chapter 2 Sections 1-3; and Chapter 3 Sections 1-3 with the following exception: • Chapter 3 Section 3 Subsection “Tangential Acceleration” — The textbook has many great worked out examples which are helpful to read and work through: • Chapter 1 examples: 1-8; 1-9 • Chapter 2 examples: 2-1 though 2-3; 2-9 through 2-10; 2-12 through 2-17 • Chapter 3 examples: 3-2 through 3-9; 3-12 — Below are some additional end of the chapter problems: Chapter 2: 1-9; 12-17; 21; 24-27; 29-30; 32-35; 43-44; 48-51; 54; 58-59; 64-69; 71;77-78; 83-88; 90; 92 Chapter 3: 1-8; 10-12; 16; 19-27; 30-31; 38-39; 47-49; 55-58; 69; 72-77; 80-89 Study Tips and Strategies • Physics exams are not like exams you might have had for other classes where you simply have to remember a lot of facts. You won’t be able to simply memorize a bunch of equations and expect to receive an A. Overall, physics exams are about two main things: conceptual understanding and problem-solving skills. You will have to apply physics concepts and principles, and also be able to solve problems using physics concepts and equations. • Make sure you give yourself plenty of time to study. Developing conceptual understanding and problem solving skills takes time, rarely is it something that you get the ﬁrst time you are exposed to it. The more time you give yourself and the more exposures you have to these ideas, the more it will sink it. • The way you become good at something is by practicing — physics is no different! What is the best way of “practicing” physics? Working through and solving problems which test your conceptual understanding and problem solving skills. What are the conceptual understanding and problem solving skills you need to know? There is a list of them at the end of this study guide — they are called learning objectives. • The best way to work through physics problems is to ﬁrst try to solve the problem by yourself and then look at the solution. Reading the problem and then immediately reading through the solution will NOT help you. Do you get a nice worked out solution when you take the actual exam? NO! Try to work through problems in the same conditions as you will take the exam. • What are the best types of problems to work through? Those found in current quizzes, lecture slides, homework & discussion problems, past exams & quizzes, worked out examples in the textbook, and end of the chapter problems in the textbook. Important Equations from FlipIt Units 1-3 Displacement: ! Average Speed = ! Instantaneous Speed = ! Average Velocity: ! Instantaneous Velocity: ! Average Acceleration: ! Instantaneous Acceleration: ! Kinematic Equations for Constant Acceleration ! ! ! Kinematics Equations for Projectile Motion: Horizontal: ! ! ! Vertical: ! ! ! Magnitude of Vector: ! Vector in Component Form: ! Magnitude of Centripetal Acceleration: ! Speed for Uniform Circular Motion: ! Transformation of Velocity: ! Δx = xf −xi Total Distance Total Time |v| vavg = Δx Δt v = d x dt aavg = Δv Δt = vf −vi tf −ti a = dv dt x(t) = xo + voxt + 1 2 axt2 v(t) = vox + axt v2 = v2 ox + 2ax(x −xo) x(t) = xo + voxt vx(t) = vox ax = 0 y(t) = yo + voyt −1 2 gt2 vy(t) = voy −gt ay = −g | ⃗ v | = v2 x + v2 y ⃗ v = vx ̂ i + vy ̂ j ac = v2 r v = 2πr T ⃗ v AB = ⃗ v AC + ⃗ v CB Exam 1 Learning Objectives Common questions students have for a particular course are: “What exactly will this course cover?” and “What is going to be on the exams?”. The course learning objectives will be used to address these questions. A learning objective is a statement of what you should be able to do for a particular concept or topic. Below are a list of learning objectives that you should be able to do for exam 1. When writing questions for exam 1, I will primarily rely on the following learning objectives. For each learning objective, they should be read as follows: “On the exam, I should be able to…”. For example, the sixth learning objective under the Kinematics Quantities section would be read as “On the exam, I should be able to determine whether an object is speeding up or slowing down”. Note: those learning objectives that are italicized are more conceptual in nature • Kinematic Quantities: Distance, Displacement, Position, Speed, Velocity, and Acceleration (Unit 1) - Explain the difference between position, distance, and displacement - Explain how position, velocity, and acceleration are related - Explain the difference between the average and instantaneous value of something such as velocity - Calculate the distance, displacement, and position for an object - Calculate the average and instantaneous speed, velocity, and acceleration for an object - Determine in what direction an object is moving and whether an object is speeding up or slowing down - Calculate the displacement of an object given the velocity vs time graph (area under the curve) - Graph the position, velocity, and acceleration of an object with constant acceleration - Solve for and be able to graph the velocity (or acceleration) given a position (or velocity) vs time graph • 1D Kinematics (Unit 1) - State the 3 kinematic formulas for constant acceleration and explain what the variables represent - Plot both the x and y components of the position vs time, velocity vs time, and acceleration vs time for objects undergoing 1D motion - Solve 1D kinematic problems for constant acceleration using the kinematic equations: i.e. solve for the total time, total distance, maximum height, initial/ﬁnal positions, initial/ﬁnal velocities, etc. - Solve 1D kinematic problems involving two objects, i.e. throwing two balls at different times or two cars traveling along the same road • 2D Kinematics (Unit 2) - Explain when an object is in free-fall - Describe how the velocity and acceleration of an object in free fall change over time - Describe how the superposition principle applies to objects in free fall - State the horizontal and vertical kinematic equations for projectile motion - Decompose the motion (position, velocity, and acceleration) of an object into x and y components - Plot both the x and y components of the position vs time, velocity vs time, and acceleration vs time for objects undergoing 2D motion - Draw the average velocity vector given the initial and ﬁnal position vectors - Draw the average acceleration vector given the initial and ﬁnal velocity vectors - Solve 2D kinematic problems with constant acceleration using the kinematic equations: i.e. solve for the total time, total distance, maximum height, initial/ﬁnal positions, initial/ﬁnal velocities, etc. • Vectors (Unit 2) - Explain the difference between scalars and vectors and identify a quantity as being one or the other - Graph vectors given either in component form or as a magnitude & direction - Express a vector in component form or as a magnitude & direction given its graph. You should be able to clearly deﬁne the direction of a vector through both an angle and a direction (i.e. ! south of east) - Decompose a vector into components given the magnitude and direction and vice versa - Add and subtract vectors both graphically and algebraically • uploads/Philosophie/ exam1-studyguide.pdf