3.Distance travelled is always positive. Displacement is the shortest distance between the initial position and the final position of the moving particle in a particular direction. A body is said to have non-uniform acceleration if its velocity increases or decreases by unequal amount in equal intervals of time. Is Displacement the same as Distance? Where v is the speed, s is the distance covered and ‘t’ is the time taken. Displacement is a vector quantity as it depends upon both magnitude and direction. 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. all rights reserved. When a body is moving with uniform velocity, its acceleration is zero (or no acceleration). Displacement is indicated with an arrow while distance is never indicated with an arrow. Sol. Displacement of the particle in a given interval of time may be positive, negative or zero. e.g. 3.Displacement may be positive,negative or zero. Class-9 » Science. The distance travelled by the car is measured by another instrument called ODOMETRE. The distance can only have positive values. Displacement is a vector quantity, which means that the displacement of an object depends on the direction of the motion of the object. When an object covers equal distance in equal intervals of time, it is said to move with uniform speed. When a body continuously moves in the same straight line and in the same direction then displacement will be equal to the distance travelled. Distance is nothing but the length of the total route travelled by the object during motion. (a) If a person is moving along a straight line AB with C as a mid-point of line AB. Its motion is known as uniformly accelerated motion. Question. Question 3. Time taken to cover second S distance with speed 60 km/h. it changes according to the path taken. Find the average speed of the bus for the entire journey. The distance can be measured along a non-straight path. It may be positive, negative, or zero. Distance is the total length of path traversed by … What are distance and displacement? The velocity of an object at any given instant of time at particular point of its path is called its instantaneous velocity. Distance is a scalar quantity whereas displacement is a vector quantity. over here on EduRev! Motion Class 9 Extra Questions Short Answer Questions-II. Body has a non-uniform if it travels unequal distances in equal intervals of time. This is because there is no change in velocity as Initial velocity = Final velocity. 1. Displacement does not depend upon the path and it only depends upon the initial and final position of the body. By understanding the concepts of distance and displacement, understanding these differences will become easier. The complete length of the path between any two points is called distance. Displacement of a body is define as the shortest distance from initial to final position of the body. it is a vector quantity. Read motion class 9 notes wisely to score better in examination. Distance is the length of the actual path traveled by an object in a given interval of time. most of the motion in daily life are having non uniform acceleration. Distance is always equal to or greater than the displacement. 2.Distance is a scalar quantity. Khan Academy is a 501(c)(3) nonprofit organization. As average speed = also, average velocity = . it is measure red by speedometer in an automobile. Speed and Velocity. Distance between a given set of initial and final position can have infinite values. The velocity in uniform motion does not depend on the choice of the time interval (t2 – t1). Distance is a scalar quantity. Displacement: It is the shortest distance measured between the initial and final positions. It is the actual length of the path covered by a moving body. Distance depends upon the path i.e. It does not have any direction. Then time taken to cover first distance with speed 40 km/h. It is defined as total displacement covered by particle divided by total time taken to cover that displacement. For example, if we drop a ball from the roof of a building, we will find that it covers unequal distances in equal intervals of time. Distance: S. No. Person moves from A to C with velocity and C to B with velocity So, average velocity of a person for whole motion. 2. 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. Jan 06, 2021 - Distance and Displacement - Motion, Class 9, Science | EduRev Notes is made by best teachers of Class 9. Displacement is always indicated with an arrow. Solution: The acceleration is negative (i.e. Question. It is a vector quantity. The velocity is positive if the object is moving towards the right of the origin and negative if the object is moving towards the left of the origin. In other words velocity of a body is its speed in a given direction. The speed of a running car is shown by an instrument called “SPEEDOMETRE”. If a body covers unequal distance in equal intervals of time, its motion is said to be non-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. Displacement :-1. Distance only considers magnitude while displacement takes into account both magnitude and direction. Displacement is a vector quantily. What is the average speed of the car? 1. Distance travelled by the particle depends upon the path followed by the particle in going from initial position to the final position. (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 . If a body travels in a straight line and its velocity increases in equal amounts in equal intervals of time. These differences between distance and displacement, given in tabular form can also help students to retain the points in a better way. Distance and Displacement . A body is said to be accelerating if its velocity is changing. 2. To calculate distance, the direction is not considered. Velocity of a body is defined as the displacement travelled by it per unit time. 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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 … Distance is a scalar quantity whereas displacement is a vector quantity. 4. distance travelled by a body changes according to the path of the body. 5 difference between speed and velocity class 9, Suppose the water flow out from a pipe at 3 kgs-1 and its velocity changes from 5 ms-1 to zero on striking the balls, then, Example 3.6: A hose pipe ejects water at a speed of through a hole of area , if the water strikes a wall normally, calculate the force on the wall, assuming the velocity of the water normal to the wall is zero after striking. Following are the differences between distance and displacement: 1. Displacement between a given set of initial and final position is unique. 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. Distance is a scalar quantity, which means the distance of any object does not depend on the direction of its motion. From this discussion we conclude that the motion of a freely falling body is an example of non-uniform motion. The amount of space between two points, measured along the minimum path which connects them, is called displacement. If speed is constant then also body can have a non-uniform velocity. Hence average speed is equal to the magnitude of its average velocity. 4.Distance is always greater than or equal to displacement. We use the terms speed and velocity in everyday usage, but it does not mean very different to us. For an object is uniform motion no force is required to maintain its motion. Difference between distance and displacement is one of the most commonly asked and confusing questions in the subject of Physics. 2. Let’s understand with the following diagram Distance here will be = 4m + 3m + 5m = 12 m Distance is the total movement of an object without any regard to direction. It was really helpful for me and I understood it very well thanks BYJU’S. Well, as we mentioned, the distance something travels is the entire length of its journey. Distance is a scalar measure while displacement is a vector. 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'.? Distance is the length of the actual path travelled by an object in a given interval of time. Copyright © 2020 Entrancei. 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. Your email address will not be published. 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. 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. Displacement is a vector quantity that refers to "how far out of place an object is"; it is the object's overall change in position. When the velocity of a body changes at unequal rate or non-uniform rate. 2. Difference between Speed and … 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. 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. 1. The displacement of the particle between initial position and final position of the particle does not depend upon the path followed by it. These differences between distance and displacement, given in tabular form can also help students to retain the points in a better way. Check the related articles below to learn additional topics related to displacement and distance. 3. Displacement is the directed line segment between initial and final position of a moving body. We can define speed as a function of distance traveled whereas velocity is a function of displacement. Displacement is the direct length between any two points when measured along the minimum path between them. Differentiate between distance and displacement. The amount of space between two points, measured along the actual path, which connects the two points, is called distance. We can define distance as to how much ground an object has covered despite its starting or ending point. Velocity: Displacement of a body per unit time is said to be; We can also say that speed with a specific direction. unit of speed is (metre per second). It is a scalar quantity. Give reason also. How do we understand Distance? Displacement: 1.The displacement of a body is the shortest distance between the initial and final position of the body. Question. Distance is a scalar quantity as it only depends upon the magnitude and not the direction. Distance can never be negative and displacement can be both i.e., positive or negative. Speed (A to B) Speed (B to C) Speed (C to D). Distance is a scalar quantity that refers to "how much ground an object has covered" during its motion. Question. Solution:  Suppose the total distance covered is 2S. calculate the average speed and average velocity of the object. The S.I. But if the body changes its direction while moving, then the displacement is smaller than the distance travelled. 2.Displacement is a vector quantity. Displacement can be positive, negative, and even zero. Required fields are marked *, Difference Between Distance And Displacement. Apart from being the largest Class 9 community, EduRev has the largest solved Question bank for Class 9. So the displacement would be in this situation five kilometers south. On the other hand, displacement is the least distance between starting … Calculate the acceleration of the car. t = Time taken for this change in velocity. Apart from knowing the comparison between distance and displacement, it is also suggested to know about their related concepts thoroughly and have a proper understanding of the basics. And when the train approaches the next station, the distance traveled by it per second decreases. Watch this video to know more! The velocity of an object is decreasing with passage of time. Your email address will not be published. What conclusion do you draw about acceleration of the object? As shown in figure it moves from O to P in 18 s and returns from P to Q in 6 second. The velocity in uniform motion does not depend on the choice of origin. Share with your friends. Velocity is the displacement of an object in a given interval of time. Speed and velocity can be a little confusing for most of us. Displacement may be zero for a moving particle. Displacement is the shortest distance between the initial and final positions of a moving object in a particular direction. What do you think is the definition or the difference between saying the distance something traveled versus its displacement? What are the uses of a distance-time graph? Distance is the actual length of the path travelled by the particle in a given interval of time. The better way to describe the difference between displacement and distance is here. e.g. Ex. It is always positive or zero. The motions of a train starting from the railway station is also an example of non-uniform motion. 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If moves a very small distance in equal intervals of time may be positive, negative or! Terms speed and velocity in everyday usage, but it does not depend upon the position!