1 NRT INDIA MOTION MOTION VERY SHORT ANSWER TYPE QUESTIONS 1. Have you ever experienced that the train in which you are sitting appears to move while it is at rest? 14. Two car A and B have their x ―t graphs as given: which one has the grater velocity ? x A 2. An object has moved through a distance. Can it have zero displacement? If yes, support your answer with an example. 3. A farmer moves along the boundary of a square field of side 10 m in 40 s. What will be the magnitude of displacement of the farmer at the end of 2 minutes 20 seconds? 4. Which of the following is true for displacement? B 30° t 15. What type of motion is associated with a pendulum ? (a)It can not be zero 16. Give one type of motion where distance and displacement are same. (b)its magnitude is greater than the distance travelled by the object 17. When a moving car returns to the same point what will be the displacement. 5. An object travels 16 m in 4 s and then another 16 m in 2 s. What is the average speed of the object? 6. Under what condition(s) is the magnitude of average velocity of an object equal to its average speed? 7. What does the odometer of an automobile measure? 18. Express km/ h2 in m / s −2 . 19. What does v stand for in v = u + at ? 20. Draw the velocity-time graph for a body moving with a uniform acceleration. Assume that the body is initially at rest. 21. Out of the following, identify the graph which corresponds to a motion with (i) Uniform retardation (ii) Zero acceleration. 10. What is the quantity of which is measured by the area occupied below the velocity time graph ? Speed 9. What can you say about the motion of an whose distance-time graph is a straight line parallel to the time axis? Speed 8. What is the nature of distance – time graph for uniform and non-uniform motion of an object? Time Time A B 12. What is instantaneous velocity ? 13. If 5 m/s and 10 m/s are the velocities of a body having a uniform acceleration in some times interval, what will be its average velocity ? Speed 11. Relate 36 km/h with m/sec. Time C NRT India , 14/32, RLB Road Near Munshi Pulia, Indira Nagar, Lucknow. Call: 0522-2714802, 9415905513, 8090510938 Branches : Indira Nagar, Gomti Nagar, Hazratganj ‘ 2 NRT INDIA MOTION SHORT ANSWER TYPE QUESTIONS 1. Distinguish between speed and velocity . 2. Usha swims in a 90 m long pool. She covers 180 m 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. 3. 4. 5. Starting from a stationary position, Rahul paddles his bicycles to attain a velocity of 6 m/s in 30 s. Then the applies brakes such that the velocity of the bicycle comes down to 4 m/s in the next 5 s. Calculate the acceleration of the bicycle in both the cases. A train starting from rest attains a velocity of 72 km/h in 5 minutes. Assuming that the acceleration is uniform, find (i) the acceleration nd (ii) the distance travelled by the train for attaining this velocity. The brakes applied to a car produce an acceleration of 6 m/s 2 in the opposite direction to the motion. If the car takes 2 s to stop after the application of brakes, calculate the distance it travels during this time. 6. Define uniform motion. 7. What do you mean by average velocity ? 8. List the importance of v―t graph. 9. Write two relations connecting x, r, θ, ω and v where symbols carry usual meaning. 10. Derive the relation v 2 = u2 + 2as . Draw the shape of v―t graphs in the following cases : (i) SHORT ANSWER TYPE QUESTIONS 1. Joseph jogs from one end A to the other end B of a straight 300 m road in 2 minutes 50 seconds and the n turns around the jogs 100 m back to point C in another 1 minute. What are Joseph’s average speeds and velocities in jogging (a) from A to B and (b) from A to C? 2. A ball is gently dropped from a height of 20 m. If its velocity increases uniformly at the rate of 10 m/ s 2 , with what velocity will it strike the ground? After what time will it strike the ground? 3. A car travels 30 km with a speed of 40 km/h and the next 30 km with a uniform speed of 20 km/h. Find its average speed. 4. On a 120 km track, a train travels the first 30 km at a uniform speed of 30 km/h. How fast should the train travel over the next 90 km so as to average 60 km/h for the entire trip? 5. A train travels at a speed of 60 km/h for 0.52 h, at 30 km/h for the next 0.24 h and then at 70 km/h for the next 0.71 h. What is the average speed of the train? 6. A scooterist travels at a speed of 5 m/s for two minutes, at 12.5 m/s for 10 minutes and then with 10 m/s for 5 minutes. What is the average velocity and distance curved in this time? 7. A ship is moving at a speed of 56 km/hr. One second later, it is moving at a speed of 58 km/hr. What is (i) its acceleration, and (ii) the distance covered ? 8. A car moves in a circular path of radius 14 m at a speed of 10 m/s. Evaluate : (a) Time taken to complete the circle Uniform retardation (i) Does the motion have uniform acceleration? Give reasons. (ii) non-uniform acceleration (ii) Find the angular velocity. 11. A car starts from rest and accelerates with 2 m/ s 2 for 10 seconds. After maintaining the velocity for 10 seconds, it comes to rest decelerating by 1 m/s 2 . Draw the shape of v―t graph. 9. Define acceleration and state its SI unit. For motion long a straight line, when do we consider the acceleration to be (i) positive (ii) negative ? Give an example of a body in uniform acceleration. NRT India , 14/32, RLB Road Near Munshi Pulia, Indira Nagar, Lucknow. Call: 0522-2714802, 9415905513, 8090510938 Branches : Indira Nagar, Gomti Nagar, Hazratganj 3 NRT INDIA MOTION 10. Define circular motion. Is circulatory motion an accelerated motion? Give reasons. 11. What do you understand by the term acceleration ? When is acceleration positive and when is negative ? State the units of acceleration in S. I. system. LONG ANSWER TYPE QUESTIONS 1. Derive the three basic equations of motion for a body moving in a straight line with constant acceleration. 2. The figure below shows the x―t graph of three people A, B and C. On the basis of the graph, answer the following with reasons ; (i) Who among the three is travelling the fastest ? (ii) Are all three ever at the same point on the road? (iii) Where is C at a time when B passes A ? (iv) How far did B travel between the time he passed C and A? B C Distance (km) 12 10 A 11 8 6 4 2 x 0 0.4 0.8 1.2 1.6 Time (t) NRT India , 14/32, RLB Road Near Munshi Pulia, Indira Nagar, Lucknow. Call: 0522-2714802, 9415905513, 8090510938 Branches : Indira Nagar, Gomti Nagar, Hazratganj

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