Motion Cl ass 9 Physics Source - S Ch and Multiple Choice Questions (MCQs) 42. A particle is moving in a circular path of radius r. The displacement after half a circle would be : (a) 0 (b) rtr (c) 2r (4) 2itr 43. The numerical ratio of displacement to distance for a moving object is : (a) always less than 1 (b) equal to 1 or more than 1 (c) always more than 1 (d) equal to 1 or less than 1 44. A boy is sitting on a merry-go-round which is moving with a constant speed of 10 m s-1. This means that the boy is : (a) at rest (1) moving with no acceleration (c) in accelerated motion (d) moving with uniform velocity 45. In which of the following cases of motion, the distance moved and the magnitude of displacement are equal? (a) if the car is moving on straight road (b) if the car is moving on circular road (c) if the pendulum is moving to and fro (d) if a planet is moving around the sun 46. The speed of a moving object is determined to be 0.06 m/s. T
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Class 9 Motion Physics 1. A scooterist covers a distance of 3 kilometres in 5 minutes. Calculate his speed in: (a) centimetres per second (cm/s) (b) metres per second (m/s) (c) kilometres per hour (km/h) Solution. (a) In order to calculate the speed in centimetres per second we should convert the given distance of 3 kilometres into centimetres and the given time of 5 minutes into seconds. Please note that 1 kilometre has 1000 metres and 1 metre has 100 centimetres. Now, Distance travelled =3 km = 3 x 1000 m = 3 x 1000 x100 cm = 300,000 cm ----------------- (1) Time taken = 5 minutes = 5 x 60 seconds = 300 s ------------------------------ (2) We know that, Speed = Distance travelled / Time taken = 300,000 cm / 300 s = 1000 cm/s --------------- (3) Thus, the speed of scooterist is 1000 centimetres per second. (b) In order to express the speed in metres per second we should convert the given distance of 3 kilometres into metres and the
Physics Motion Class 9 Source - S Chand Very Short Answer Type Questions 1. (a) What remains constant in uniform circular motion? (b) What changes continuously in uniform circular motion? 2. State whether the following statement is true or false: Earth moves round the sun with uniform velocity. 3. A body goes round the sun with constant speed in a circular orbit. Is the motion uniform or accelerated? 4. What conclusion can you draw about the velocity of a body from the displacement-time graph shown below: 5. Name the quantity which is measured by the area occupied under the velocity-time graph. 6. What does the slope of a speed-time graph indicate? 7. What does the slope of a distance—time graph indicate? 8. Give one example of a motion where an object does not change its speed but its direction of motion changes continuously. 9. Name the type of motion in which a body has a constant speed but not constant velocity. 10. What can you say about the motion of a body if i
Physics Motion Cl ass 9 Questions taken from S. Chand Questions Based on High Order Thinking Skills (HOTS) 55. A body is moving along a circular path of radius R. What will be the distance travelled and displacement of the body when it completes half a revolution ? 56. If on a round trip you travel 6 km and then arrive back home : (a) What distance have you travelled ? (b) What is your final displacement ? 57. A body travels a distance of 3 km towards East, then 4 km towards North and finally 9 km towards East. (i) What is the total distance travelled ? (it) What is the resultant displacement ? 58. A boy walks from his classroom to the bookshop along a straight corridor towards North. He covers a distance of 20 m in 25 seconds to reach the bookshop. After buying a book, he travels the same distance in the same time to reach back in the classroom. Find (a) average speed, and (b) average velocity, of the boy. 59. A car travels 100 km at a speed of 60 km/h and returns wi
Class - 9 Motion Numericals Source : S Chand Book Short Answer Type Questions 1. Is displacement a scalar quantity? 2. State whether distance is a scalar or a vector quantity. 3. Change the speed of 6 m/s into km/h. 4. What name is given to the speed in a specified direction? 5. Give two examples of bodies having non-uniform motion. 6. Name the physical quantity obtained by dividing 'Distance travelled' by 'Time taken' to travel that distance. 7. What do the following measure in a car? (a) Speedometer (b) Odometer 8. Name the physical quantity which gives us an idea of how slow or fast a body is moving. 9. Under what conditions can a body travel a certain distance and yet its resultant displacement be zero ? 10. In addition to speed, what else should we know to predict the position of a moving body ? 11. When is a body said to have uniform velocity ? 12. Under which condition is the magnitude of average velocity equal to average speed ? 13. Which of
NCERT Solutions Class 9 English Beehive Chapter 1 - The Fun They Had NCERT Class 9 Beehive Page No. 10 I. Answer these questions in a few words or a couple of sentences each. 1. How old are Margie and Tommy? 2. What did Margie write in her diary? 3. Had Margie ever seen a book before? 4. What things about the book did she find strange? 5. What do you think a telebook is? 6. Where was Margie’s school? Did she have any classmates? 7. What subjects did Margie and Tommy learn? Answer: 1. 1. Margie is eleven year old and Tommy is thirteen year old. 2. 2. Margie wrote, “Today Tommy found a real book!”. 3. 3. No, Margie had never seen a book before. 4. 4. Margie found it strange that the book had yellow and wrinkled pages. Words in the book were still and did not move the way they were supposed to on a screen. 5. 5. A book that can be displayed on a screen is called a