Displacement :-1. Motion Class 9 Extra Questions Short Answer Questions-II. 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. Distance is a scalar quantity. 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. A car covers the 1st half of the distance between two places at a speed of 40 km h-1 and the 2nd half at 60 km h-1. At the most, it can become zero. Note Distance is a scalar quantity but Displacement is a Vector Quantity Share 13. Distance is the length of the actual path traveled by an object in a given interval of time. Velocity of a body is defined as the displacement travelled by it per unit time. It was really helpful for me and I understood it very well thanks BYJU’S. 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) For an object is uniform motion no force is required to maintain its motion. 2. it is a vector quantity. The motions of a train starting from the railway station is also an example of non-uniform motion. 2. The train moves a little more distance in the ‘2nd’ second and so on. 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. Displacement is the direct length between any two points when measured along the minimum path between them. Speed of a body is defined as the distance travelled by it per unit time irrespective of direction. Check the related articles below to learn additional topics related to displacement and distance. 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. Hence average speed is equal to the magnitude of its average velocity. Solution:  Suppose the total distance covered is 2S. As displacement refers to the shortest path, it does not give complete information on the route. Displacement is a vector quantity, which means that the displacement of an object depends on the direction of the motion of the object. What do you think is the definition or the difference between saying the distance something traveled versus its displacement? In other words velocity of a body is its speed in a given direction. 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. When the velocity of a body changes at unequal rate or non-uniform rate. 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. 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. Distance gives the detailed route information that is followed while travelling from one point to another. (a) If a person is moving along a straight line AB with C as a mid-point of line AB. Question. Displacement of a body is define as the shortest distance from initial to final position of the body. Is Displacement the same as Distance? Distance is a scalar quantity as it only depends upon the magnitude and not the direction. Displacement is a vector quantity as it depends upon both magnitude and direction. it changes according to the path taken. 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. Become a member to get exclusive access to perks! Well, as we mentioned, the distance something travels is the entire length of its journey. What are the uses of a distance-time graph? Displacement: It is the shortest distance measured between the initial and final positions. Distance is the actual length of the path travelled by the particle in a given interval of time. Displacement may decrease with time. Speed and Velocity. From this discussion we conclude that the motion of a freely falling body is an example of non-uniform motion. Displacement can be positive, negative, and even zero. Motion: An object is said to be in motion if the position changes with respect to it surrounding and time. Sol. Share with your friends. 2. The velocity of an object at any given instant of time at particular point of its path is called its instantaneous velocity. Ex. Displacement between a given set of initial and final position is unique. Required fields are marked *, Difference Between Distance And Displacement. (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 1. The distance can be measured along a non-straight path. 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. Body has a non-uniform if it travels unequal distances in equal intervals of time. Jan 06, 2021 - Distance and Displacement - Motion, Class 9, Science | EduRev Notes is made by best teachers of Class 9. It is the actual length of the path covered by a moving body. e.g. differentiate between distance and displacement. Question. 1. Displacement is a vector quantily. What conclusion do you draw about acceleration of the object? Distinguish between distance and displacement. On the other hand, displacement is the least distance between starting … 2. 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 the total movement of an object without any regard to direction. Difference between Speed and … A car moving on a circular road with constant speed. 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 is always taken as positive. Solution: Suppose the distance between the stations is S. Time taken in reaching from one station to another station. A body is said to have non-uniform acceleration if its velocity increases or decreases by unequal amount in equal intervals of time. A man takes 40 seconds to complete one circle .radius of the circle is 10metre. The difference between distance and displacement is tabulated below: These are the main differences between distance and displacement, that can help to distinguish these two thoroughly. Distance travelled by the particle depends upon the path followed by the particle in going from initial position to the final position. e.g. The distance travelled by the car is measured by another instrument called ODOMETRE. https://www.youtube.com/channel/UCQOcoDkqHPiqpubEg0Y-oQw/join 3. The S.I. 2 Motion of a bicycle going down the slope of a road when the rider is not pedaling and wind resistance is negligible. Speed is the distance travelled by an object in a given interval of time. To understand the differences, it is important to know their in-depth concepts thoroughly. Speed and velocity can be a little confusing for most of us. We can define speed as a function of distance traveled whereas velocity is a function of displacement. (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. 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'.? 2. If speed is constant then also body can have a non-uniform velocity. Displacement may be zero for a moving particle. The velocity of an object is decreasing with passage of time. Following are the differences between distance and displacement: 1. It is defined as total displacement covered by particle divided by total time taken to cover that displacement. Displacement can only be measured along a straight path. A-1, Acharya Nikatan, Mayur Vihar, Phase-1, Central Market, New Delhi-110091. Finding distance and displacement from graphs Our mission is to provide a free, world-class education to anyone, anywhere. Where v is the speed, s is the distance covered and ‘t’ is the time taken. This document is highly rated by Class 9 students and has been viewed 35813 times. Distance travelled by the particle in a given interval of time is always positive. A body is said to be accelerating if its velocity is changing. Displacement is indicated with an arrow while distance is never indicated with an arrow. The velocity in uniform motion does not depend on the choice of origin. This is because when the train starts from a s station, if moves a very small distance in the ‘first’ second. The complete length of the path between any two points is called distance. 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. When an object covers equal distance in equal intervals of time, it is said to move with uniform speed. 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. 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. What are distance and displacement? The velocity-time graph for a body having non uniform acceleration is curved line. 2. all rights reserved. Velocity = $$\frac{displacement}{time}$$ Its Unit is also m/s. Distance travelled is a scalar quantity while displacement is a vector quantity. It is a vector quantity. Displacement is the directed line segment between initial and final position of a moving body. The rate of change of velocity with time is known as acceleration. 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. 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. Distance is always equal to or greater than the displacement. It has a unique direction. But if the body changes its direction while moving, then the displacement is smaller than the distance travelled. Distance depends upon the path i.e. Distance only considers magnitude while displacement takes into account both magnitude and direction. Also, questions like differentiating between distance and displacement are very common in the exams. Distance: Displacement: 1. 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Distance: S. No. e.g. By understanding the concepts of distance and displacement, understanding these differences will become easier. Question. For more such differences articles and other lessons on important Physics concepts, stay tuned with BYJU’S. As shown in figure it moves from O to P in 18 s and returns from P to Q in 6 second. 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.Distance is a scalar quantity. Displacement is the shortest distance between the initial position and the final position of the moving particle in a particular direction. Then time taken to cover first distance with speed 40 km/h. 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. most of the motion in daily life are having non uniform acceleration. How do we understand Distance? Answer: The various uses of a distance-time graph are as follows: In other words, the acceleration is defined as the change in velocity per unit time. Please note that the distance-time graph for uniform motion is a straight line. S. No. Distance and Displacement . 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. 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. Your email address will not be published. Class-9 » Science. Class-9 » Science. Displacement is always indicated with an arrow. 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). The distance can only have positive values. Distance can never be negative and displacement can be both i.e., positive or negative. 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. Displacement does not depend upon the path and it only depends upon the initial and final position of the body. 3.Distance travelled is always positive. Velocity is the displacement of an object in a given interval of time. Displacement: 1.The displacement of a body is the shortest distance between the initial and final position of the body. To calculate distance, the direction is not considered. 1. Copyright © 2020 Entrancei. Distance is the length of the actual path travelled by an object in a given interval of time. calculate the average speed and average velocity of the object. Differentiate between distance and displacement. The velocity in uniform motion does not depend on the choice of the time interval (t2 – t1). it is measure red by speedometer in an automobile. A body moving with non-uniform velocity is said to be in accelerated motion. Distance is the total path covered by the body and displacement is the shortest path covered by the body. Read motion class 9 notes wisely to score better in examination. If a body covers unequal distance in equal intervals of time, its motion is said to be non-uniform. Give reason also. Distance between a given set of initial and final position can have infinite values. Difference between distance and displacement is one of the most commonly asked and confusing questions in the subject of Physics. These differences between distance and displacement, given in tabular form can also help students to retain the points in a better way. Distance doesn’t decrease with time whereas displacement decreases. Category : 9th Class Difference between Distance and Displacement . Motion. Displacement: 1. 4.Distance is always greater than or equal to displacement. 2.Displacement is a vector quantity. It does not have any direction. Your email address will not be published. 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. We can define distance as to how much ground an object has covered despite its starting or ending point. The amount of space between two points, measured along the actual path, which connects the two points, is called distance. Distance is nothing but the length of the total route travelled by the object during motion. So the displacement would be in this situation five kilometers south. It may be positive, negative, or zero. So pause this video. If a body travels in a straight line and its velocity increases in equal amounts in equal intervals of time. Distance is a scalar quantity, which means the distance of any object does not depend on the direction of its motion. It is a scalar quantity. It is a vector quantity. 1. Displacement = AB = Shortest distance between initial and final positions = r + r = 2r. e.g. Distance is the total length of path traversed by … Calculate the acceleration of the car. Find the average speed of the bus for the entire journey. The speed of a running car is shown by an instrument called “SPEEDOMETRE”. Question: A car is moving along x-axis. The amount of space between two points, measured along the minimum path which connects them, is called displacement. This is because there is no change in velocity as Initial velocity = Final velocity. Person moves from A to C with velocity and C to B with velocity So, average velocity of a person for whole motion. Watch this video to know more! 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. 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. To calculate displacement, the direction is taken into consideration. It can also be represented as centimetre per second and kilometre per hour. Speed (A to B) Speed (B to C) Speed (C to D). 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