So pause this video. Distance is a scalar quantity. The distance travelled by the car is measured by another instrument called ODOMETRE. Distance is the length of the actual path travelled by an object in a given interval of time. Difference between speed and velocity is one of the most interesting topics in Physics. Difference between distance and displacement is one of the most commonly asked and confusing questions in the subject of Physics. 2. Displacement of the particle in a given interval of time may be positive, negative or zero. What conclusion do you draw about acceleration of the object? In first case, car is accelerated and in the second case, the car is retarded. Check the related articles below to learn additional topics related to displacement and distance. Class-9 » Science. 2. Solution: The acceleration is negative (i.e. The difference between speed and velocity is also a very common question asked in board exams and competitive entrance exams like JEE and NEET. Distance: Displacement: 1. Displacement between a given set of initial and final position is unique. When the velocity of a body changes at unequal rate or non-uniform rate. Speed and velocity can be a little confusing for most of us. 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) The distance can never be zero but displacement can be. Distance is always equal to or greater than the displacement. Distance travelled is a scalar quantity while displacement is a vector quantity. Distance doesn’t decrease with time whereas displacement decreases. 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. Displacement: It is the shortest distance measured between the initial and final positions. If a body covers unequal distance in equal intervals of time, its motion is said to be non-uniform. At the most, it can become zero. It was really helpful for me and I understood it very well thanks BYJU’S. When a body continuously moves in the same straight line and in the same direction then displacement will be equal to the distance travelled. Question:  A car attains a speed of 10 ms−1 in 10 s, starting from rest. It is defined as total displacement covered by particle divided by total time taken to cover that displacement. Displacement can be positive, negative, and even zero. 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. Motion. A body is said to be accelerating if its velocity is changing. Copyright © 2020 Entrancei. 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. Distance gives the detailed route information that is followed while travelling from one point to another. Where v is the speed, s is the distance covered and ‘t’ is the time taken. 2. We use the terms speed and velocity in everyday usage, but it does not mean very different to us. A car moving on a circular road with constant speed. 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. The velocity-time graph for a body having non uniform acceleration is curved line. The displacement of the particle between initial position and final position of the particle does not depend upon the path followed by it. retardation). Solution: Suppose the distance between the stations is S. Time taken in reaching from one station to another station. Displacement is a vector quantity as it depends upon both magnitude and direction. In other words velocity of a body is its speed in a given direction. Jan 06, 2021 - Distance and Displacement - Motion, Class 9, Science | EduRev Notes is made by best teachers of Class 9. (a) If a person is moving along a straight line AB with C as a mid-point of line AB. Question. 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. The distance can be measured along a non-straight path. The amount of space between two points, measured along the actual path, which connects the 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, which means the distance of any object does not depend on the direction of its motion. 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. It is a vector quantity. Distance is the actual length of the path travelled by the particle in a given interval of time. In this video, I will explain to you a very important concept to understand kinematics that is distance and displacement.we cannot understand the basic … Distance travelled by the particle depends upon the path followed by the particle in going from initial position to the final position. If speed is constant then also body can have a non-uniform velocity. 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. As shown in figure it moves from O to P in 18 s and returns from P to Q in 6 second. Example: When is the average speed of an object equal to the magnitude of its average velocity ? These differences between distance and displacement, given in tabular form can also help students to retain the points in a better way. A body moving with non-uniform velocity is said to be in accelerated motion. 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. On the other hand, displacement is the least distance between starting … When a body is moving with uniform velocity, its acceleration is zero (or no acceleration). We can define distance as to how much ground an object has covered despite its starting or ending point. Displacement can only be measured along a straight path. Its motion is known as uniformly accelerated motion. 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. Let’s understand with the following diagram Distance here will be = 4m + 3m + 5m = 12 m 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. Answer: Distance. A-1, Acharya Nikatan, Mayur Vihar, Phase-1, Central Market, New Delhi-110091. Question. 2. Displacement is the directed line segment between initial and final position of a moving body. 1. https://www.youtube.com/channel/UCQOcoDkqHPiqpubEg0Y-oQw/join 3. Question. Displacement :-1. Category : 9th Class Difference between Distance and Displacement . Displacement is the shortest distance between the initial position and the final position of the moving particle in a particular direction. 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 an object moves along a straight line and in the same direction its total path length is equal to the magnitude of its displacement. Distance travelled by the particle in a given interval of time is always positive. The better way to describe the difference between displacement and distance is here. 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'.? To understand the differences, it is important to know their in-depth concepts thoroughly. it changes according to the path taken. 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Displacement of a body is define as the shortest distance from initial to final position of the body. 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. The velocity of an object is decreasing with passage of time. This is because when the train starts from a s station, if moves a very small distance in the ‘first’ second. Is Displacement the same as Distance? This is because there is no change in velocity as Initial velocity = Final velocity. 2.Distance is a scalar quantity. For an object is uniform motion no force is required to maintain its motion. Rest: An object is said to be at rest if it does not change its position with respect to its surroundings with time. Distance is the total path covered by the body and displacement is the shortest path covered by the body. (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 . Please note that the distance-time graph for uniform motion is a straight line. S. No. 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. Answer: Question 2. Khan Academy is a 501(c)(3) nonprofit organization. Question: A car is moving along x-axis. Question 3. t = Time taken for this change in velocity. Velocity of a body is defined as the displacement travelled by it per unit time. Give reason also. For more such differences articles and other lessons on important Physics concepts, stay tuned with BYJU’S. Time taken to cover second S distance with speed 60 km/h. The velocity in uniform motion does not depend on the choice of origin. Displacement is the direct length between any two points when measured along the minimum path between them. Distance between a given set of initial and final position can have infinite values. all rights reserved. It does not have any direction. The train moves a little more distance in the ‘2nd’ second and so on. In other words, the acceleration is defined as the change in velocity per unit time. 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: 1.The displacement of a body is the shortest distance between the initial and final position of the body. Therefore, 25 km/hr is SPEED and 25 km/hr towards North is VELOCITY. Speed is given by the relation: Velocity is given by the relation: The speed of an object can never be negative. These differences between distance and displacement, given in tabular form can also help students to retain the points in a better way. 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. (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. It is a scalar quantity. Velocity = $$\frac{displacement}{time}$$ Its Unit is also m/s. A non-stop bus goes from one station to another station with a speed of 54 km/h, the same bus returns from the second station to the first station with a speed of 36 km/h. Distance depends upon the path i.e. 3.Displacement may be positive,negative or zero. 3.Distance travelled is always positive. Distance and Displacement . The motions of a train starting from the railway station is also an example of non-uniform motion. Distance is a scalar measure while displacement is a vector. Share 13. Then time taken to cover first distance with speed 40 km/h. Displacement is indicated with an arrow while distance is never indicated with an arrow. Read motion class 9 notes wisely to score better in examination. e.g. Class-9 » Science. The S.I. So the displacement would be in this situation five kilometers south. Displacement is a vector quantity, which means that the displacement of an object depends on the direction of the motion of the object. Become a member to get exclusive access to perks! calculate the average speed and average velocity of the object. Distinguish between distance and displacement. Speed (A to B) Speed (B to C) Speed (C to D). It is a vector quantity. Answer: The various uses of a distance-time graph are as follows: Required fields are marked *, Difference Between Distance And Displacement. 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. Displacement: 1. Your email address will not be published. most of the motion in daily life are having non uniform acceleration. A body is said to have non-uniform acceleration if its velocity increases or decreases by unequal amount in equal intervals of time. Question 1. Displacement is the shortest distance between the initial position and the final position of the moving particle in a particular direction. Distance is the total length of path traversed by … If a body travels in a straight line and its velocity increases in equal amounts in equal intervals of time. Differentiate between distance and displacement. Ex. When an object covers equal distance in equal intervals of time, it is said to move with uniform speed. Speed of a body is defined as the distance travelled by it per unit time irrespective of direction. It can also be represented as centimetre per second and kilometre per hour. Person moves from A to C with velocity and C to B with velocity So, average velocity of a person for whole motion. Distance is a scalar quantity whereas displacement is a vector quantity. Never indicated with an arrow, stay tuned with BYJU ’ s whereas velocity also! May decrease with time is always greater than the displacement of the commonly! Entire journey at any given instant of time is indicated with an arrow of. Then displacement will be equal to the magnitude of its average velocity: Class!, difference between distance and displacement from graphs Our mission is to provide a free, world-class education anyone... 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