Time (in minutes) Distance travelled Distance travelled 0 by Varun(km) by Shreya(km) 0 0 5 1 0.5 10 2 1 15 3 1.5 20 – 2 25 – 2.5 30 – 3 Plot the distance time graph for their journey on the same graph. From the graph, how can you tell who is faster? CHAPTER 12. GRAPHS OF MOTION 99

CHAPTER 12. GRAPHS OF MOTION 100

Objective Questions AS1-Conceptual Understanding 22. Choose the correct answer. (i) If a body covers equal distance in equal intervals of time, it is in (A) non–uniform motion (B) uniform motion (C)uniform or non–uniform motion (D)state of rest (ii) What is the meaning of the slope on a distance versus time graph? (A) Displacement (B) Momentum (C) Speed (D) Acceleration (iii) If the distance–time graph for a body is parallel to the X –axis, the body is (A) moving with non uniform speed (B) at rest (C)moving with uniform speed (D)moving along a plane road (iv) A body is said to be in non uniform motion, if the speed of the body (A) remains constant (B) does not remain constant (C)either A or B (D)is zero CHAPTER 12. GRAPHS OF MOTION 101

(v) The graph of distance versus time for non–uniform motion is a (A) straight line passing through the origin (B) straight line parallel to X–axis (C)straight line parallel to Y–axis (D)curved line (vi) Distance travelled equals the product of time taken and (A) velocity (B) acceleration (C) speed (D)average speed AS2-Asking questions and making hypothesis 23. Choose the correct answer. (i) Which of these examples is closest to uniform motion? (A) Vehicle on a busy curved road (B) Vehicle travelling on a busy straight road (C)Vehicle stationary at a point (D)Vehicle travelling on a straight empty road AS5-Communication through drawing and model making 24. Choose the correct answer. (i) Which of the following distance – time graphs represent uniform motion? CHAPTER 12. GRAPHS OF MOTION 102

(A) (B) (C) (D) (ii) The distance–time graph of two objects A and B are shown in the ﬁgure. Which of the following sentences is true about their slopes? (A) Slope of A is greater than B (B) Slope of A is lesser than B (C)Both the objects have equal slope (D)None of the options (iii) Following is a description of a train’s journey: The train leaves the station and coversa distance of 60 km in 1 ½ hours. Next the train stops for half an hour and then contnues itsjourney for another half an hour covering a distance of 40 km. Which of the following graphs matches the description of the journey? CHAPTER 12. GRAPHS OF MOTION 103

(A) 104 (B) (C) (D) CHAPTER 12. GRAPHS OF MOTION

Previous Year Questions (i) The graph of Suma’s journey is shown below. Read the graph. Answer the following questions. a) What quantity is represented on Y–axis? b) What is Suma’s speed from B to C? c) Which section of the graph has the greater slope? d) What is the Suma’s average speed in her entire journey? CHAPTER 12. GRAPHS OF MOTION 105

PROJECT BASED QUESTIONS —— Project Based Questions —— (i) Being a student of science you know that lightning conductor is an important device to protect the house from lightning. Now consider that one of your neighbours have not installed it in his building. Write a letter to your neighbour mentioning the importance and working of a lightning conductor so that he gets convinced to install it in his building. (ii) Make a report on various devices to measure earthquake. Mention how do they work with pictures and how helpful it is for mankind. (iii) Taking help from internet or magazines collect pictures of solar eclipse and lunar eclipse and make a detailed report describing them and their effects. Or In the 26th general assembly of International Astronomical Union it was decided that ‘Pluto’ would not be considered as a planet anymore. Do research and make a de- tailed report on why earlier Pluto was considered as a planet and why not now. (iv) We know that data literacy allows the learner to ask and answer meaningful questions by collecting, analyzing and making sense of the data encountered in real life. Make a project report on why plotting graphs is so important in Education? Project Based Questions 106

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