3. Question 1. The train moves a little more distance in the ‘2nd’ second and so on. It is defined as total displacement covered by particle divided by total time taken to cover that displacement. These differences between distance and displacement, given in tabular form can also help students to retain the points in a better way. Let’s understand with the following diagram Distance here will be = 4m + 3m + 5m = 12 m The velocity in uniform motion does not depend on the choice of the time interval (t2 – t1). 3.Distance travelled is always positive. A man takes 40 seconds to complete one circle .radius of the circle is 10metre. Copyright © 2020 Entrancei. The distance can be measured along a non-straight path. In first case, car is accelerated and in the second case, the car is retarded. Displacement of a body is define as the shortest distance from initial to final position of the body. What are the uses of a distance-time graph? Speed (A to B) Speed (B to C) Speed (C to D). Displacement = AB = Shortest distance between initial and final positions = r + r = 2r. Solution: The acceleration is negative (i.e. And when the train approaches the next station, the distance traveled by it per second decreases. It is a vector quantity. Hence average speed is equal to the magnitude of its average velocity. 2. The velocity of an object at any given instant of time at particular point of its path is called its instantaneous velocity. 2. Question. Distance is always taken as positive. Distance doesn’t decrease with time whereas displacement decreases. Velocity is the displacement of an object in a given interval of time. Note Distance is a scalar quantity but Displacement is a Vector Quantity Displacement: 1.The displacement of a body is the shortest distance between the initial and final position of the body. Speed and velocity can be a little confusing for most of us. Answer: Question 2. Displacement can only be measured along a straight path. From this discussion we conclude that the motion of a freely falling body is an example of non-uniform motion. Distance: Displacement: 1. Displacement is the direct length between any two points when measured along the minimum path between them. 1. A car starts from rest and attains a velocity of 10 ms−1 in 40 s. The driver applies brakes and slows down the car to 5 ms−1 in 10 s. Find the acceleration of the car in both the cases. Displacement between a given set of initial and final position is unique. It has a unique direction. calculate the average speed and average velocity of the object. It does not have any direction. The motions of a train starting from the railway station is also an example of non-uniform motion. It is the actual length of the path covered by a moving body. In other words, the acceleration is defined as the change in velocity per unit time. Distance is a scalar quantity that refers to "how much ground an object has covered" during its motion. Read motion class 9 notes wisely to score better in examination. 1 Motion of a freely falling body is an example of uniformly accelerated motion (or motion of a body under the gravitational pull of the earth). At the most, it can become zero. Distance is the actual length of the path travelled by the particle in a given interval of time. The rate of change of velocity with time is known as acceleration. The distance can only have positive values. Question:  A car attains a speed of 10 ms−1 in 10 s, starting from rest. Displacement is the shortest distance between the initial position and the final position of the moving particle in a particular direction. Distance is the length of the actual path traveled by an object in a given interval of time. Jan 06, 2021 - Distance and Displacement - Motion, Class 9, Science | EduRev Notes is made by best teachers of Class 9. To calculate distance, the direction is not considered. Velocity of a body is defined as the displacement travelled by it per unit time. most of the motion in daily life are having non uniform acceleration. Displacement: 1. Displacement is indicated with an arrow while distance is never indicated with an arrow. Displacement is the directed line segment between initial and final position of a moving body. If a body covers unequal distance in equal intervals of time, its motion is said to be non-uniform. It is always positive or zero. You can study other questions, MCQs, videos and tests for Class 9 on EduRev and even discuss your questions like Write a difference between distance and displacement in 'tabular form'.? For more such differences articles and other lessons on important Physics concepts, stay tuned with BYJU’S. The complete length of the path between any two points is called distance. 2 Motion of a bicycle going down the slope of a road when the rider is not pedaling and wind resistance is negligible. Distance is a scalar quantity. By understanding the concepts of distance and displacement, understanding these differences will become easier. Watch this video to know more! 4. distance travelled by a body changes according to the path of the body. We use the terms speed and velocity in everyday usage, but it does not mean very different to us. RS Aggarwal Solutions for class 7 Math's, lakhmirsingh Solution for class 8 Science, PS Verma and VK Agarwal Biology class 9 solutions, Lakhmir Singh Chemistry Class 9 Solutions, CBSE Important Questions for Class 9 Math's pdf, MCQ Questions for class 9 Science with Answers, Important Questions for class 12 Chemistry, MOTIONS IN ONE, TWO AND THREE DIMENSIONS (TYPE OF MOTION), MATHEMATICAL DERIVATION OF EQUATIONS OF MOTION, Important Questions CBSE Class 10 Science. 1. Then what is the Distance and displacement travelled by him So Radius of Park is 20/2 = 10 m Distance travelled = 2π×r = 2 × 22/7 × 10 = 62.85 Displacement = Shortest distance between initial and final point Since, initial point = final point, displacement = 0. Displacement does not depend upon the path and it only depends upon the initial and final position of the body. This is because when the train starts from a s station, if moves a very small distance in the ‘first’ second. As average speed = also, average velocity = . (c) If a body is having uniform acceleration or in other words if the velocity of a body is changing at a uniform rate then the average velocity is given by the ‘arithmetic mean’ of the initial velocity and final velocity for a given period of time. (a) If a person is moving along a straight line AB with C as a mid-point of line AB. Share 13. Ex. Your email address will not be published. Distance: S. No. Solution:  Suppose the total distance covered is 2S. 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