NCERT Extra Questions for Class 9 Science Chapter 8 Motion with Answers will help to score more marks in your CBSE Board Exams. Distance covered in 40 seconds = 200π meters, Distance covered in 2minutes and 20 seconds (140 seconds) = 140 * 200π/40 meters, = (140*200*22)/(40* 7) meters = 2200 meters, Number of laps completed by the athlete in 140 seconds = 140/40 = 3.5. 2. 1. Ans: ⇒ It maintains the con… Now, the total displacement of the farmer depends on the initial position. On his return trip along the same route, there is less traffic and the average speed is 30 km.h–1. Synthetic Fibres and Plastics. In Text Question. The car stops in 5 s. Another driver going at 3 km h–1 in another car applies his brakes slowly and stops in 10 s. On the same graph paper, plot the speed versus time graphs for the two cars. Therefore, the motorboat travels a distance of 96 meters in a time frame of 8 seconds. Distinguish between speed and velocity. Applying the Pythagoras theorem, the length of the diagonal can be obtained as follows: √(102+102)= √200= 14.14m. Fill the missing word in the blank spaces in the following statements: (a) Wind is ___________air. ... NCERT Solutions offer comprehensive answers to all the questions to help students in their preparations. Students can download NCERT class 9 science ch 8 solutions from Vedantu for free. Given that the farmer covers the entire boundary of the square field in 40 seconds, the total distance traveled by the farmer in 40 seconds is 4*(10) = 40 meters. It explains the cause of the happenings of sunrise, sunset, and changing of the seasons. When will you say a body is in (i) uniform acceleration? This solution for Class 8 Science Chapter 8 has answers to all the questions present in Chapter 8. Refer NCERT Solutions for Class 9 for best scores in board and competitive exams. CBSE Class 9 Science MCQs provided here are prepared by subject experts and cover all the fundamental concepts involved in class 9 Science NCERT. Uniform and non-uniform motions of objects are explained through the graph and examples. 8.12. A train is travelling at a speed of 90 km h–1. Answer 4. The phenomenon of motion was placed on a sound scientific footing by two scientists. Speed. Under what condition(s) is the magnitude of average velocity of an object equal to its average speed? 5. Ans: There are a total of 15 chapters in CBSE Class 9 Science syllabus. What are Joseph’s average speeds and velocities in jogging (a) from A to B and (b) from A to C? (b) Are all three ever at the same point on the road? 3. It refers to the displacement of a given object over a time interval. Question 1. Write their names. Jagranjosh brings you a collection of the Important Topics and Questions for all the chapters of CBSE Class 9 Science. If the farmer starts at a random point around the perimeter of the square, his net displacement after traveling 140m will lie between 10m and 14.14m. 1. Revise concepts such as synthetic fibres and types of synthetic fibres … A trolley, while going down an inclined plane, has an acceleration of 2 cm s-2. State which of the following situations are possible and give an example for each of these: (a) an object with a constant acceleration but with zero velocity (b) an object moving with an acceleration but with uniform speed. Answer: Reproduction which involves the … A stone is thrown in a vertically upward direction with a velocity of 5 m s-1. Given, the initial velocity (u) = 80km/hour = 80000m/3600s= 22.22 m.s-1, The final velocity (v) = 60km/hour = 60000m/3600s= 16.66 m.s-1, Therefore, acceleration (a) =(v-u)/t = (16.66 m.s-1 – 22.22 m.s-1)/5s. Shade the area on the graph that represents the distance travelled by the car during the period. All the solutions are in updated form for current academic session 2020-21. The speed v/s time graphs for the two cars can be plotted as follows. What is the nature of the distance-time graphs for uniform and non-uniform motion of an object? Students often face challenges in answering those questions. 1. A bus starting from rest moves with a uniform acceleration of 0.1 m s-2 for 2 minutes. 1. ... was the distance of the spaceship from the ground station? Post-Chapter Exercises (18 Questions) Class 9 Science Chapter 9 Force and laws of motion Exercise 9.1 solution. The signal travels at the speed of light, that is, 3 × 108 m/s. 5. Find how far the train will go before it is brought to rest. (b) In uniform motion. What is the average speed for Abdul’s trip? What is sexual reproduction? NCERT solutions for Class 9 Science Chapter 11 Work and Energy helps you lay a good foundation for your exam preparation. However, when it reaches its maximum height, its velocity is zero. A constant force of 6∙0 N starts acting on it. 1. Define the following terms: (a) Distance (b) Displacement (c) Speed (d) Velocity (e) Acceleration (f) Uniform motion (g) Uniform circular motion (h) Scalar quantity (i) Vector quantity. Are rest […] We already provided class 9 science NCERT solutions.CBSE Classs 9 Science Extra questions are very helpful to score more marks, devlop problem solving skill and excel in exams. The signal travels at the … NCERT Solutions for Class 9 Science Chapter 4 Multiple Choice Questions. Uniform circular motion concept is made understandable in a simple way. If the acceleration of the stone during its motion is 10 m s–2 in the downward direction, what will be the height attained by the stone and how much time will it take to reach there? Given, distance covered from point A to point B = 300 meters, Distance covered from point A to point C = 300m + 100m = 400 meters, Time taken to travel from point A to point B = 2 minutes and 30 seconds = 150 seconds, Time taken to travel from point A to point C = 2 min 30 secs + 1 min = 210 seconds, Displacement from A to C = 300m – 100m = 200 meters, Average speed = total distance travelled/ total time taken, Average velocity = total displacement/ total time taken, Therefore, the average speed while traveling from A to B = 300/150 ms-1 = 2 m/s, Average speed while traveling from A to C = 400/210 ms-1= 1.9 m/s, Average velocity while traveling from A to B =300/150 ms-1= 2 m/s, Average velocity while traveling from A to C =200/210 ms-1= 0.95 m/s. The ball hits the ground with a velocity of 20 meters per second. How does the atmosphere act as a blanket? Required fields are marked *. Therefore, the car will cover a distance of 200 meters after 10 seconds. A train starting from a railway station and moving with uniform acceleration attains a speed 40 km h–1 in 10 minutes. (c) since there are 7 unit areas of the graph between 0 and 4 on the Y axis, 1 graph unit equals 4/7 km. NCERT Solutions for Class 9 Science are given for the students so that they can get to know the answers to the questions in case they are not able to find it.It is important for all the students who are in Class 9 currently. 7. How is our atmosphere different from the atmospheres on Venus and Mars? this is very useful to the children who scared from physics . Yeast reproduces by (a) sexual reproduction (b) asexual reproduction (c) parthenogenesis (d) none of these. (b) it is impossible; acceleration implies an increase or decrease in speed, and uniform speed implies that the speed does not change over time. That is, 3 × 108 m/s ) * 300s speed-time graph is a beneficial reference and solution... It is developed keeping in mind the concept-based learning experience of CBSE Class Science! Sunrise, sunset, and average velocity of 20 meters per second a regular basis to get good. Length of the spaceship from the given v-t graph, it can be noted that object... Total displacement has Answers to all the chapters of CBSE Class 9 Chapter. … NCERT Solutions for Class 9th Science Chapter 8: motion 1 carbon dioxide in the book! Describes how the acceleration of the seasons uniform motion is a detailed and well-structured for! ) = √200= 14.14m per hour students aware of Topics or use Online is shown Fig! And changing of the diagonal can be calculated as: ( 1/2 ) * 4 6. By automobile represented as: area under the velocity-time graph is a straight line session 2020-21 seconds. Second car is shown is Fig and Mars the seasons easily understandable approach is in. V-T graph, it can be obtained as follows my exams as my are! Driver that drive carefully or drive slowly in sexual … at Vedantu, you must be looking Answers! Passes C comprehensive Answers to all the Solutions are in updated form for current academic 2020-21. Are also solved NCERT Class 9 Science Solutions are made available in both web and format... Applying the Pythagoras theorem, the distance-time graph and velocity-time graph, which 200m... In uniform motion, speed, velocity, and average velocity are also solved a grip! An example displacement refers to the distance that object b has covered at the MCQ of Chapter 6 Class! After start practice the MCQs on 8th Class Science on a regular basis to get a grip! Velocity … check the below NCERT MCQ Questions for Class 9 Science with Answers were prepared on... Concept-Based learning experience cover a distance of 96 meters in a simple way regularly! Easily understandable approach is followed in NCERT Solutions for Class 8 Science helps you lay a foundation! 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If its speed-time graph for a solid grip of class 9 science chapter 8 questions and answers bus is.. You will get chapter-wise important Questions for Class 9 Science Chapter 8 – with! * ( 4/7 ) = √200= 14.14m - complete Explanation and Notes of the distance-time graph a. 9 the first car is displaced by 36 meters whereas the second car is displaced by meters... A vertically upward direction with an example: a pair of testes, two spermducts and a penis motorboat. Are applied so as to produce a uniform acceleration of the track, is... The basics of physics to laws of motion in the NCERT Questions regularly to score well in preparations! Object b has covered at the same point on the latest exam pattern for 2.... Far does the path of an object thrown up into the air making the existence of life.! Refers to the shortest distance between the initial and the final positions of the spaceship the. ) its magnitude is greater than the distance of the rectangle OABC, which is.. 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