Title Class 09 Science Chapter 8 Motion.pdf ✅

Motion DPP-01 [Topic: Describing Motion, Uniform and Non-Uniform Motion, Speed with Direction] Very Short Answer Type Questions 1. An object has moved through a distance. Can it have zero displacement? If yes, support your answer with an example. 2. Which of the following is true for displacement? (a) It cannot be zero. (b) Its magnitude is greater than the distance travelled by the object. 3. An object travel16m in 4s and then another 16m in 2s. What is the average speed of the object? 4. What does the odometer of an automobile measures? 5. What does the path of an object look like when it is in uniform motion? 6. What does speedometer used for? 7. Change speed of 6m/s into km/hr. 8. A tortoise moves a distance of 100m in 15 minutes. What is the average speed in km per hour? 9. A bus covers equal distance in equal interval of time. What type of motion does bus exhibits? 10. A car travels a distance of 360km in 5 hours. What is speed in ms−1 ? 11. A particle is moving in a circular path of radius ' rr '. What is the displacement of half a circle? 12. What will be the numerical ratio of displacement to distance for a moving object? 13. A cricket ball covers 60m in 2 seconds. Calculates the speed of the ball in km per hour. Short Answer Type Questions-I 14. A farmer moves along the boundary of a square field of side 10m in 40s. What will be the magnitude of displacement of the farmer at the end of 2 minutes 20 seconds? 15. Distinguish between speed and velocity. 16. A body travels in a semicircular path of radius 10m starting its motion from point ' A ' to point ' B '. Calculate the distance and displacement. 17. During first half of a journey a body travels with a speed of 40km/hour and in the next half it travels with a speed of 20km/hr. Calculate the average speed of the whole journey. 18. Usha swims in a 90m long pool. She covers 180m in one minute by swimming from one end to the other and back along the same straight path. Find the average speed and average velocity of Usha. 19. Under what condition(s) is the magnitude of average velocity of an object equal to its average speed?
20. During an experiment, a signal from a spaceship reached the ground station in five minutes. What was the distance of the spaceship from the ground station? The signal travels at the speed of light, i.e.,3 × 108ms−1. 21. Give four differences between distance and displacement. 22. The displacement of a moving object in a given interval of time is zero. Would the distance travelled by an object is also zero? Justify your answer. Short Answer Type Questions-II 23. A boy travels 5km towards north, then he turns to right and travels another 5km before coming to rest. Calculate, (i) total distance travelled (ii) total displacement. 24. What will be the speed of body in m/s if it travels 40km in 5hrs ? 25. The odometer of a car reads 2000km at the start of a trip and 2400km at the end of the trip. If the trip takes 8hr, calculate the average speed of the car in kmh−1 and ms−1. 26. An athlete completes one round of a circular track of diameter 200m in 40s. What will be the distance covered and the displacement at the end of 2 minutes 20s ? 27. Joseph jogs from one end AA to the other end BB of a straight 300m road in 2 minutes 50 seconds and then turns around and jogs 100m back to point C in another 1 minute. What is Joseph's average speed and velocity in jogging from (a) A to B and (b) A to C? 28. The minutes hand is 7cm long. Calculate the distance covered and the displacement of minute hand of the clock from 9AM to 9.30AM. 29. The sun light reaches the earth in 8.5min. Calculate the distance between the sun and the Earth if velocity of light is 3 × 108ms1.
Motion DPP-02 [Topic: Rate of Change of Velocity, Graphical Representation of Motion] Very Short Answer Type Questions 1. What can you say about the motion of an object whose distance-time graph is a straight line parallel to the time axis? 2. What can you say about the motion of an object if its speed-time graph is a straight line parallel to the time axis? 3. What is the quantity which is measured by the area occupied below the velocity-time graph? 4. The graph illustrates the motion of an object. Which feature of the graph represents the distance travelled by the object whilst moving at constant speed? 5. A stone is falling freely through the air. The acceleration of a free fall in 9.8m/s2. Ignoring air resistance what happen to the stone at each second during the fall? 6. Suppose a boy is enjoying a ride on merry go round which is moving with a constant speed of 10ms−1. What type of motion is associated with the merry go round? 7. Four cars AA, BB, CC and DD are moving on a levelled road. Their distance versus time graphs are shown in Fig. Choose the correct statement (a) Car A is faster than car D. (b) Car B is the slowest. (c) Car D is faster than car C. (d) Car C is the slowest. 8. Which of the following figures represent uniform motion of a moving object correctly?