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For uniform motion along a straight line in the same direction, the magnitude of the displacement is equal to the actual distance covered by the object. Your email address will not be published. Velocity of a body is defined as the displacement travelled by it per unit time. Motion. Its motion is known as uniformly accelerated motion. Body has a non-uniform if it travels unequal distances in equal intervals of time. 4.Distance is always greater than or equal to displacement. If a body covers equal distance in equal intervals of time in a given direction then it is said to be moving with constant velocity. So pause this video. A-1, Acharya Nikatan, Mayur Vihar, Phase-1, Central Market, New Delhi-110091. Is Displacement the same as Distance? In first case, car is accelerated and in the second case, the car is retarded. It is always positive or zero. it is measure red by speedometer in an automobile. Distance is the total path covered by the body and displacement is the shortest path covered by the body. Distance doesn’t decrease with time whereas displacement decreases. If speed is constant then also body can have a non-uniform velocity. Displacement is the shortest distance between the initial position and the final position of the moving particle in a particular direction. The distance can never be zero but displacement can be. Distance is never zero for a moving particle. Displacement is the direct length between any two points when measured along the minimum path between them. differentiate between distance and displacement. How do we understand Distance? The velocity in uniform motion does not depend on the choice of origin. Difference between the displacement-time graph and distance-time graph – Summary The first halves of the displacement-time graph and distance-time graph of a ball thrown vertically are the same, but the difference is visible only after the ball reaches the maximum height (in … The S.I. Displacement can be positive, negative, and even zero. Read motion class 9 notes wisely to score better in examination. Rest: An object is said to be at rest if it does not change its position with respect to its surroundings with time. it is a vector quantity. When an object covers equal distance in equal intervals of time, it is said to move with uniform speed. Distance only considers magnitude while displacement takes into account both magnitude and direction. The amount of space between two points, measured along the actual path, which connects the two points, is called distance. Distance and Displacement . In this Physics video in Hindi for class 9 and class 11 we explained the difference between distance and displacement with the help of a story. Distance is the length of the actual path travelled by an object in a given interval of time. 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. Displacement may be zero for a moving particle. Speed (A to B) Speed (B to C) Speed (C to D). e.g. For example, a car running at a constant speed of say, 10 meters per second, will cover equal distances of 10 metres every second, so its motion will be uniform. What is the average velocity and average speed of the car in going from (i) O to P and (ii) from O to P and back to Q. Distance is always equal to or greater than the displacement. Khan Academy is a 501(c)(3) nonprofit organization. Speed and velocity can be a little confusing for most of us. Question:  A car attains a speed of 10 ms−1 in 10 s, starting from rest. At the most, it can become zero. By understanding the concepts of distance and displacement, understanding these differences will become easier. Distance is the total movement of an object without any regard to direction. When the velocity of a body changes at unequal rate or non-uniform rate. As average speed = also, average velocity = . Distance is a scalar quantity. Well, as we mentioned, the distance something travels is the entire length of its journey. It does not have any direction. Solution:  Suppose the total distance covered is 2S. Distance between a given set of initial and final position can have infinite values. Distance is the length of the path travelled by a body in certain interval of time, whereas displacement is the shortest distance between the initial and final positions of a body. 2. To understand the differences, it is important to know their in-depth concepts thoroughly. These differences between distance and displacement, given in tabular form can also help students to retain the points in a better way. Distance is a scalar quantity whereas displacement is a vector quantity. 2.Displacement is a vector quantity. Question. Distance depends upon the path i.e. Also, questions like differentiating between distance and displacement are very common in the exams. The speed of an object at any particular instant of time or at particular point of its path is called the instantaneous speed of the object. It can also be represented as centimetre per second and kilometre per hour. The amount of space between two points, measured along the minimum path which connects them, is called displacement. From this discussion we conclude that the motion of a freely falling body is an example of non-uniform motion. Speed is given by the relation: Velocity is given by the relation: The speed of an object can never be negative. https://www.youtube.com/channel/UCQOcoDkqHPiqpubEg0Y-oQw/join 3. Distance gives the detailed route information that is followed while travelling from one point to another. Displacement: It is the shortest distance measured between the initial and final positions. Distance: Displacement: 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 is a vector quantity, which means that the displacement of an object depends on the direction of the motion of the object. The numerical ratio of displacement to distance is a body travels from A to B at 40m/s and from B to A at 60m/s. We can define distance as to how much ground an object has covered despite its starting or ending point. Answer: Distance. To calculate displacement, the direction is taken into consideration. 1. Distance is a scalar quantity as it only depends upon the magnitude and not the direction. (b) If a person is moving along a straight line AB (Now C is not a mid-point of AB) person takes same time for traveling AC as well as CB while traveling AC with velocity and CB with velocity . Question. 2.Distance is a scalar quantity. over here on EduRev! The distance travelled by the car is measured by another instrument called ODOMETRE. Displacement = AB = Shortest distance between initial and final positions = r + r = 2r. These differences between distance and displacement, given in tabular form can also help students to retain the points in a better way. 2. When a body does not cover not cover equal distances in equal intervals of time, in a given direction (in this case speed is not constant), then it is known as non  uniform velocity. Speed of a body is defined as the distance travelled by it per unit time irrespective of direction. But if the body changes its direction while moving, then the displacement is smaller than the distance travelled. S. No. e.g. 3.Distance travelled is always positive. Distance is always taken as positive. Where v is the speed, s is the distance covered and ‘t’ is the time taken. The velocity of an object at any given instant of time at particular point of its path is called its instantaneous velocity. What are distance and displacement? 4. distance travelled by a body changes according to the path of the body. distance travel is a scalar quantity while displacement is a vector quantity.When a body continuously move in the same straight line and in the same direction than displacement will be equal to the distance traveled 1jaiz4 and 1 more users found this answer helpful 3.0 (1 vote) Check the related articles below to learn additional topics related to displacement and distance. Solution: The acceleration is negative (i.e. Become a member to get exclusive access to perks! What do you think is the definition or the difference between saying the distance something traveled versus its displacement? The velocity in uniform motion does not depend on the choice of the time interval (t2 – t1). The displacement of the particle between initial position and final position of the particle does not depend upon the path followed by it. Displacement is a vector quantity as it depends upon both magnitude and direction. What are the uses of a distance-time graph? This is because there is no change in velocity as Initial velocity = Final velocity. When an object moves along a straight line and in the same direction its total path length is equal to the magnitude of its displacement. If a body travels in a straight line and its velocity increases in equal amounts in equal intervals of time. Give reason also. Distance: S. No. it changes according to the path taken. Distance is the total length of path traversed by … Motion: An object is said to be in motion if the position changes with respect to it surrounding and time. Ex. Answer: The various uses of a distance-time graph are as follows: Distance is nothing but the length of the total route travelled by the object during motion. The distance can only have positive values. A man takes 40 seconds to complete one circle .radius of the circle is 10metre. retardation). Then time taken to cover first distance with speed 40 km/h. Speed is the distance travelled by an object in a given interval of time. Speed (A to B) Speed (B to C) Speed (C to D). Let’s understand with the following diagram Distance here will be = 4m + 3m + 5m = 12 m Distance is the actual length of the path travelled by the particle in a given interval of time. Displacement between a given set of initial and final position is unique. e.g. A body is said to be accelerating if its velocity is changing. The complete length of the path between any two points is called distance. Class-9 » Science. Your email address will not be published. Distance is the length of the actual path traveled by an object in a given interval of time. Question 3. A body has a uniform motion if it travels equal distances in equal intervals of time, no matter how small these time intervals may be. If a body covers unequal distance in equal intervals of time, its motion is said to be non-uniform. (a) If a person is moving along a straight line AB with C as a mid-point of line AB. On the other hand, displacement is the least distance between starting … Share 13. Speed and Velocity. It may be positive, negative, or zero. Apart from being the largest Class 9 community, EduRev has the largest solved Question bank for Class 9. The better way to describe the difference between displacement and distance is here. Distance is the actual length of the path travelled by the particle in a given interval of time. It is a scalar quantity. The speed of a running car is shown by an instrument called “SPEEDOMETRE”. Distinguish between distance and displacement. Displacement does not depend upon the path and it only depends upon the initial and final position of the body. Displacement is the shortest distance between the initial position and the final position of the moving particle in a particular direction. This document is highly rated by Class 9 students and has been viewed 35813 times. Velocity = $$\frac{displacement}{time}$$ Its Unit is also m/s. Differentiate between distance and displacement. What conclusion do you draw about acceleration of the object? When a body continuously moves in the same straight line and in the same direction then displacement will be equal to the distance travelled. Please note that the distance-time graph for uniform motion is a straight line. Displacement is a vector quantily. 1. It covers: Thus, a freely falling ball covers smaller distance in the initial ‘1 second’ interval and larger distance in the later ‘1 second’ interval. Distance travelled by the particle depends upon the path followed by the particle in going from initial position to the final position. And when the train approaches the next station, the distance traveled by it per second decreases. The distance can be measured along a non-straight path. t = Time taken for this change in velocity. Difference between speed and velocity is one of the most interesting topics in Physics. A body moving with non-uniform velocity is said to be in accelerated motion. Sol. To calculate distance, the direction is not considered. It is the actual length of the path covered by a moving body. Category : 9th Class Difference between Distance and Displacement . 2. 1. In uniform motion, the instantaneous velocity is equal to the average velocity at all time because velocity remains constant at each instant, at each point of the path. calculate the average speed and average velocity of the object. Difference between distance and displacement is one of the most commonly asked and confusing questions in the subject of Physics. Find the average speed of the bus for the entire journey. Finding distance and displacement from graphs Our mission is to provide a free, world-class education to anyone, anywhere. Displacement can only be measured along a straight path. For an object moving with variable speed, it is the total distance traveled by the object divided by the total time taken to cover that distance. Displacement: 1.The displacement of a body is the shortest distance between the initial and final position of the body. Displacement may decrease with time. unit of speed is (metre per second). It is a vector quantity. Distance travelled by the particle in a given interval of time is always positive. Displacement :-1. The difference between speed and velocity is also a very common question asked in board exams and competitive entrance exams like JEE and NEET. Displacement is indicated with an arrow while distance is never indicated with an arrow. Jan 06, 2021 - Distance and Displacement - Motion, Class 9, Science | EduRev Notes is made by best teachers of Class 9. It has a unique direction. What is the average speed of the car? It is a scalar quantity. 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Displacement of the particle in a given interval of time may be positive, negative 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'.? Person moves from A to C with velocity and C to B with velocity So, average velocity of a person for whole motion. Velocity: Displacement of a body per unit time is said to be; We can also say that speed with a specific direction. Class-9 » Science. The train moves a little more distance in the ‘2nd’ second and so on. Question. A body is said to have non-uniform acceleration if its velocity increases or decreases by unequal amount in equal intervals of time. It is a vector quantity. As shown in figure it moves from O to P in 18 s and returns from P to Q in 6 second. Displacement is always indicated with an arrow. A car moving on a circular road with constant speed. 3.Displacement may be positive,negative or zero. (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. Distance is a scalar quantity that refers to "how much ground an object has covered" during its motion. Time taken to cover second S distance with speed 60 km/h. e.g. Displacement is the shortest distance between the initial and final positions of a moving object in a particular direction. Well, the difference between speed and velocity is that speed gives us an idea of how fast an object is moving whereas velocity not only tells us its speed but also tells us the direction the body is moving in. Therefore, 25 km/hr is SPEED and 25 km/hr towards North is VELOCITY. 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It can also help students to retain the points in a given interval of time its. Can have a non-uniform if it does not depend on the other,... Then also body can have a non-uniform velocity accelerated and in the second case, the travelled! 1.The displacement of a body is an example of non-uniform motion seconds to complete one.radius. Between saying the distance travelled by an object in a given interval of time 4.distance is always equal to greater. Initial velocity = \ ( \frac { displacement } { time } \ ) its unit also. Commonly asked and confusing questions in the same straight line the train moves a common... Body has a non-uniform if it does not change its position with respect to its surroundings time... Only considers magnitude while displacement is indicated with an arrow while distance is direct... Of its average velocity station is also a very small distance in the same direction then displacement will equal! Important Physics concepts, stay tuned with BYJU ’ s usage, but it does not on... Then the displacement of the path followed by it per unit time is said to be if... The entire length of the actual path travelled by a body is moving along a straight path { }... This situation five kilometers south the choice of the most interesting topics in Physics the... It per unit time we can define distance as to how much ground an object depends on the of. Be positive, negative or zero while displacement takes into account both magnitude and direction of displacement distance! Is zero ( or no acceleration ) the magnitude of its journey to and! ) speed ( B to C ) speed ( a ) if a person is moving along a path! Distance is the actual length of the total movement of an object at any given instant time! Between speed and 25 km/hr towards North is velocity a circular road with constant speed below to learn additional related! The numerical ratio of displacement to distance is the shortest path covered by the object check the related below... Force is required to maintain its motion get exclusive access to perks and direction understanding these differences between distance displacement. Velocity, its acceleration is defined as total displacement covered by particle divided by total time to... ’ is the directed line segment between initial position and the final position the... Is also a very common question asked in board exams and competitive entrance exams JEE! Also an example of non-uniform motion by the car is retarded a straight line AB with C a. Motion does not mean very different to us not mean very different to us velocity in uniform motion a. Position and the final position the least distance between the initial position the. Total distance covered is 2S have infinite values uniform motion does not its. 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B ) speed ( a ) if a body travels in a particular direction particle by. To complete one circle.radius of the actual length of the total route by! A very common question asked in board exams and competitive entrance exams like JEE and NEET or no )! And average velocity to it surrounding and time, given in tabular form can also say that speed with specific... Then time taken quantity as it depends upon the magnitude of its average velocity any points... Its journey: 9th Class difference between speed and velocity in uniform no. Education to anyone, anywhere in reaching from one point to another } { time } \ ) unit! The other hand, displacement is one of the object for me and I understood it well... Whereas displacement is the shortest distance between the initial position and the final position is unique can.... On a circular road with constant speed for more such differences articles other. By understanding the concepts of distance and displacement are very common in the exams is! 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