Shows how Vehkity is felated 0) tli1r. 11w change in elocitv of an objert Ji an mstant ol tune is its

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1 I Date Period CHAPTER 3 Study Guide Accelerated Motion Vocabulary Review Write the terni that correctly completes the stalc,liemit. Use each term otice. acceleration average acceleration acceleration due to gravity free lall instantaneous acceleration VClO(itVtiIflC graph 1. Shows how Vehkity is felated 0) tli1r 2. 11w change in elocitv of an objert Ji an mstant ol tune is its 3. I he rate at which au ohje ds elocit\ chandr S is its 4, I he motion ol fal hng obje ts s Iwo alt i r sistan(c is negligible is called I he 01 an obje t is the hangr in s doe it during some measurable time in t rval divided b that t i rnr interval Ihe acceleration olan objeu in lice fall that results horn he influence of lartli s gias its is Section 3.1 Acceleration In your textbook, read about changing velocits and veloctv time giaphs 0 ig s 1. Refer to this velocity-time graph of a ogger to eotiipletc Iw two taiies on Ph l1e\t page j G) > 0.15 A B I -±+ + f Time (mn) Physics. Principles and Problems C Iiaptei s I Resources 81

2 3 - Segment V A B C 82 Chapters 1 5 Resources Physics: Principles and Problems Guide continued -r rr W W W Study [n your textbook, read about acceleration on pages Circle the letter of the choice that best completes the statement or answers the question. 2. The slope of a tangent line on a velocity-time graph is the a displacement c. average acceleration b. velocity d acceleration due to gravity 3. When acceleration and velocity vectors are pointing in opposite directions, the object is a. speeding up C. moving at constant speed b. slowing down d not moving 4. If a runner accelerates from 2 rn/s to 3 rn/s in 4 s, her average acceleration is 2 c O4O 2 rn/s a. 4O rn/s 2 d O2S 2 rn/s b 2 5 rn/s 5. The area under a velocity-time graph is equal to the object s a. stop time C. displacement b. acceleration d. average speed 6. The area under an acceleration-time graph is equal to the object s a. velocity C, change in acceleration b. weight d. displacement

3 Physics: Prim iples and Problems Chapters 1 Resources 83 between these two? Explain your answers, indicate? 11. Object A and Object E both have a constant velocity and acceleration of zero. What is different 9, Which of these objects started its motion from rest? Which object comes to a complete stop? 7. Which has the greater acceleration, Object A or B? How do you kno? > E v East The graph below shows the motion of five objects. Refer to the graph to answer questions 7 il. continued 0 $tudjiüde Name 8. Which of these objects has the least value of acceleration? how do you know? 10. Object 1) crosses the axis while maintaining a constant positive acceleration. What does this West Time (s) A > -I E

4 Name 020 rn/s 84 Chapters 1 5 Resources Physics: Principles and Problems 3 Study Guide continued Section 3.2 Motion with Constant Acceleration lii your textbook, read about VelOCItV \ Jib aerage acceleration, position with constant acceleration, and an alternative expression for position, velocity and time on pages Complete the tables below, Fill in the values for the initial conditions and the variables. Write a question mark for the unknown variable in each table, If a variable or initial condition is not needed to answer the problem, write X. Write the equation you would use to answer each question. Then solve the problem and show your calculations 1. A ball rolls past a mark on an inc line at 040 rn/s. If the ball has an average acceleration of 2 what is its velocity 30 s after it passes the mark? 2 over a distance of 45 rn. 2. A car initially ii iveling at 15 rn/s accelerates at a constant rate of 4.5 rn/s I low long does ii take the car to covei this distance? Initial Conditions Variables Equation t1 d1 a c 3. A car accelerates from 10 0 rn/s to 15.0 rn/s in 3.0 S. how far does the car travel?

5 Initial Conditions Variables Equation 4. A race car accelerates at 4.5 rn/s 2 from rest. What is the car s velocity after it has traveled 35.0 m? continued At Vf a Physics: Principles and Problems Chapters 1 5 Resources 85 niotion at all. If a tossed ball had no velocity or acceleration, it would have no If you toss a ball up, its acceleration at its maximum height is zero, velocity is zero. If you toss a ball up, it reaches its maximum height when its negative depends on the coordinate system you use. 7, The decision to treat acceleration due to gravity as positive or 6. If you drop a rock, its velocity after 3 s will be 19.6 ni/s. 5, Acceleration due to gravity is always downward. 4, 3, negligible. Acceleration due to gravity is the same for objects of different sizes. Ereeflull is the motion of a falling object when the air resistance is 2. Galileo concluded that objects in free fall have differetit accelerations. gravity. A feather does not fall in the same way as a pebble because of 1. For each statement below, write true or rewrite the italicized part to make the statement true. In your textbook, read about acceleration due to gravity on pages Section 3.3 Free Fall Study Guide Name

6 Name 0t2 0t3 Oti Qt4 Qto and 0. Time r a 1)3, 114, V5 in decreasing order. Time x continued that was thrown upward at timet1. Refer to the The diagram below shows the positions of a ball diagram to answer questions Ii. Assume that the downward direction is positive. For each time shown on the diagram, determine whether the direction of the velocity is positive, negative, or zero, and whether the direction of the acceleration is positive, negative, or zero. Record your answers in the table using the symbols +,, Variable t3 t4 V V a 14. Still assuming that the downward direction is negative, rank the magnitudes of the velocities v1, v2, v3, 1)4, 1)5 in decreasing order. 86 Chapters 1 5 Resources Physics: Principles and Problems rank the magnitudes of the velocities u1, 12. Still assuming that the downward direction is positive, 13 Now assume that the downward direction is negative. For each time shown on the diagram, determine whether the direction of the velocity is positive, negative, or zero, and whether the direction of the acceleration is positive, negative, or zero. Record your answers in the table using the symbols +, -, and 0. Variable t1