Name Date Partners. HOMEWORK FOR LAB 1: INTRODUCTION TO MOTION Position-Time Graphs. Answer the following questions in the spaces provided.

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1 Name Date Partners HOMEWORK FOR LAB 1: INTRODUCTION TO MOTION Graphs Answer the following questions in the spaces provided Note: These materials may have been modified locally

2 Page H12 Real Physics: Active Learning Laboratory V121β 8/11/93 Answer the following about two objects, A and B, whose motion produced the following positiontime graphs B A 6 a) Which object is moving fastera or!!!!!!b? b) Which starts ahead? Define what you mean by "ahead" c) What does the intersection mean? A 7 a) Which object is moving faster? B b) Which object has a negative velocity according to the convention we have!!!!!!established? A B 8 a) Which object is moving!!!!!!!!!faster? b) Which starts ahead? Explain what you mean by"ahead"

3 Real Physics: Homework for Lab 1: Introduction to Motion Page H13 Authors: David Sokoloff, Ronald Thornton & Priscilla Laws V121β8/11/93 Sketch the positiontime graph corresponding to each of the following descriptions of the motion of an object 9 The object moves with a steady (constant) velocity away from the origin T i m e 1 The object is standing still T i m e 11 The object moves with a steady (constant) velocity toward the origin for 5 seconds and then stands still for 5 seconds T i m e 12 The object moves with a steady velocity away from the origin for 5 seconds, then reverses direction and moves at the same speed toward the origin for 5 seconds T i m e 13 The object moves away from the origin, starting slowly and speeding up T i m e 1992 Dickinson College, Tufts University, University of Oregon

4 Page H14 Real Physics: Active Learning Laboratory V121β 8/11/93 Graphs After studying the velocitytime graphs you have made, answer the following questions: V e l 1 How do you move to create a horizontal line in the positive part of a velocitytime graph, as shown above? V e l 2 How do you move to create a straightline velocitytime graph that slopes up from zero, as shown above? V e l 3 How do you move to create a straightline velocitytime graph that slopes down, as shown above? V e l 4 How do you move to make a horizontal line in the negative part of a velocitytime graph, as shown above?

5 Real Physics: Homework for Lab 1: Introduction to Motion Page H15 Authors: David Sokoloff, Ronald Thornton & Priscilla Laws V121β8/11/93 5 The velocitytime graph of an object is shown below Figure out the total change in position (displacement) of the object Show your work Displacement = meters V e l o c i t y m/s Both of the velocity graphs below, 1 and 2, show the motion of two objects, A and B Answer the following questions separately for 1 and for 2 Explain your answers when necessary Graph 1 Graph 2 A B B a) Is one faster than the other? If so, which one is faster? (A or B) A a) Is one faster than the other? If so, which one is faster? (A or B) b) What does the intersection mean? b) What does the intersection mean? c) Can one tell which object is "ahead"? (define "ahead") c) Can one tell which object is "ahead"? (define "ahead") d) Does either object A or B reverse direction? Explain d) Does either object A or B reverse direction? Explain 1992 Dickinson College, Tufts University, University of Oregon

6 Page H16 Real Physics: Active Learning Laboratory V121β 8/11/93 Sketch the velocity time graph corresponding to each of the following descriptions of the motion of an object 7 The object is moving away from the origin at a steady (constant) velocity 8 The object is standing still 9 The object moves toward the origin at a steady (constant)!! velocity for 1 seconds, and then stands still for 1 seconds 1 2 (sec) 1 The object moves away from the origin at a steady (constant) velocity for 1 seconds, reverses direction and moves back toward the origin at the same speed for 1 seconds 1 2 (sec)

7 Real Physics: Homework for Lab 1: Introduction to Motion Page H17 Authors: David Sokoloff, Ronald Thornton & Priscilla Laws V121β8/11/93 11 Draw the velocity graphs for an object whose motion produced the positiontime graphs shown below on the left is in meters and velocity in meters per second Note: Unlike most real objects, you can assume these objects can change velocity so quickly that it looks instantaneous with this time scale 1992 Dickinson College, Tufts University, University of Oregon

8 Page H18 Real Physics: Active Learning Laboratory V121β 8/11/93 12 Draw careful graphs below of position and velocity for a cart that a moves away from the origin at a slow and steady (constant) velocity for the first 5 seconds b moves away at a mediumfast, steady (constant) velocity for the next 5 seconds c stands still for the next 5 seconds d moves toward the origin at a slow and steady (constant) velocity for the next 5 seconds e stands still for the last 5 seconds 8 (m) 4 (m/s) T i m e (sec)

9 Real Physics: Homework for Lab 1: Introduction to Motion Page H19 Authors: David Sokoloff, Ronald Thornton & Priscilla Laws V121β8/11/93 HOMEWORK FOR LAB 2: CHANGING MOTION Acceleration T i m e 1 An object moving along a line (the position axis) has the accelerationtime graph above Describe how might the object move to create this graph if it is moving away from the origin? 2 Sketch on the axes below a velocitytime graph that goes with the above accelerationtime graph For each of the velocitytime graphs below, sketch the shape of the accelerationtime graph that goes with it Acceleration Dickinson College, Tufts University, University of Oregon

10 Page H11 Real Physics: Active Learning Laboratory V121β 8/11/ Acceleration A car can move along a line (the position axis) Sketch velocitytime and accelerationtime graphs which correspond to each of the following descriptions of the car's motion 4 The car starts from rest, and moves away from the origin increasing its speed at a steady rate Acceleration 5 The car is moving away from the origin at a constant velocity Acceleration

11 Real Physics: Homework for Lab 1: Introduction to Motion Page H111 Authors: David Sokoloff, Ronald Thornton & Priscilla Laws V121β8/11/93 6 The car starts from rest, and moves away from the origin increasing its speed at a steady rate twice as large as in (4) above 7 The car is moving away from the origin at a constant velocity twice as large as in (5) above Acceleration Acceleration 8 Which positiontime graph below could be that for a cart that is steadily accelerating away from the origin? a) b) c) 1992 Dickinson College, Tufts University, University of Oregon

12 Page H112 Real Physics: Active Learning Laboratory V121β 8/11/93 9 The following is a velocitytime graph for a car What is the average acceleration of the car? Show your work below