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. 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. So the displacement would be in this situation five kilometers south. Displacement is a vector quantity as it depends upon both magnitude and direction. In first case, car is accelerated and in the second case, the car is retarded. 1. 2. Distance is always equal to or greater than the displacement. Question 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. Distance is nothing but the length of the total route travelled by the object during motion. The velocity-time graph for a body having non uniform acceleration is curved line. Category : 9th Class Difference between Distance and Displacement . Distance travelled by the particle in a given interval of time is always positive. It is defined as total displacement covered by particle divided by total time taken to cover that displacement. 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. As average speed = also, average velocity = . Share 13. The velocity in uniform motion does not depend on the choice of the time interval (t2 – t1). Distance doesn’t decrease with time whereas displacement decreases. Displacement does not depend upon the path and it only depends upon the initial and final position of the body. Distance gives the detailed route information that is followed while travelling from one point to another. 2. 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. Question: A car is moving along x-axis. Time taken to cover second S distance with speed 60 km/h. over here on EduRev! It is the actual length of the path covered by a moving body. Then time taken to cover first distance with speed 40 km/h. On the other hand, displacement is the least distance between starting … Let’s understand with the following diagram Distance here will be = 4m + 3m + 5m = 12 m Velocity: Displacement of a body per unit time is said to be; We can also say that speed with a specific direction. Solution: The acceleration is negative (i.e. differentiate between distance and displacement. So pause this video. It was really helpful for me and I understood it very well thanks BYJU’S. Distance is a scalar quantity whereas displacement is a vector quantity. Difference between Speed and … Distance is the total movement of an object without any regard to direction. Distance is always taken as positive. Question. 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. The train moves a little more distance in the ‘2nd’ second and so on. Calculate the acceleration of the car. It can also be represented as centimetre per second and kilometre per hour. Distance is the actual length of the path travelled by the particle in a given interval of time. The complete length of the path between any two points is called distance. Distance is the total length of path traversed by … 3.Distance travelled is always positive. For an object is uniform motion no force is required to maintain its motion. The S.I. The amount of space between two points, measured along the minimum path which connects them, is called displacement. The better way to describe the difference between displacement and distance is here. Speed is the distance travelled by an object in a given interval of time. 2.Distance is a scalar quantity. When a body is moving with uniform velocity, its acceleration is zero (or no acceleration). It has a unique direction. Displacement can be positive, negative, and even zero. 2.Displacement is a vector quantity. The rate of change of velocity with time is known as acceleration. Body has a non-uniform if it travels unequal distances in equal intervals of time. Distance is the length of the actual path travelled by an object in a given interval of time. Speed of a body is defined as the distance travelled by it per unit time irrespective of direction. Displacement of a body is define as the shortest distance from initial to final position of the body. all rights reserved. Motion Class 9 Extra Questions Short Answer Questions-II. The velocity of an object is decreasing with passage of time. 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. Solution: Suppose the distance between the stations is S. Time taken in reaching from one station to another station. most of the motion in daily life are having non uniform acceleration. Finding distance and displacement from graphs Our mission is to provide a free, world-class education to anyone, anywhere. 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 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) This is because when the train starts from a s station, if moves a very small distance in the ‘first’ second. Velocity of a body is defined as the displacement travelled by it per unit time. Required fields are marked *, Difference Between Distance And Displacement. These differences between distance and displacement, given in tabular form can also help students to retain the points in a better way. Give reason also. The difference between speed and velocity is also a very common question asked in board exams and competitive entrance exams like JEE and NEET. e.g. Answer: Question 2. In other words, the acceleration is defined as the change in velocity per unit time. 2. it changes according to the path taken. 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. Displacement is indicated with an arrow while distance is never indicated with an arrow. Ex. Note Distance is a scalar quantity but Displacement is a Vector Quantity A-1, Acharya Nikatan, Mayur Vihar, Phase-1, Central Market, New Delhi-110091. Displacement :-1. t = Time taken for this change in velocity. 2. Class-9 » Science. It is a vector quantity. Answer: The various uses of a distance-time graph are as follows: Class-9 » Science. Solution: Suppose the total distance covered is 2S. The distance can be measured along a non-straight path. The distance can never be zero but displacement can be. Question. 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. Please note that the distance-time graph for uniform motion is a straight line. 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 … it is measure red by speedometer in an automobile. e.g. 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. Copyright © 2020 Entrancei. It does not have any direction. 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. (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. Question 3. But if the body changes its direction while moving, then the displacement is smaller than the distance travelled. 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. 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 … Following are the differences between distance and displacement: 1. The amount of space between two points, measured along the actual path, which connects the two points, is called distance. Rest: An object is said to be at rest if it does not change its position with respect to its surroundings with time. As displacement refers to the shortest path, it does not give complete information on the route. Displacement is the shortest distance between the initial position and the final position of the moving particle in a particular direction. Displacement: 1. S. No. 3.Displacement may be positive,negative or zero. Question. Distance is a scalar quantity, which means the distance of any object does not depend on the direction of its motion. It may be positive, negative, or zero. Therefore, 25 km/hr is SPEED and 25 km/hr towards North is VELOCITY. Distance and Displacement . Distance is never zero for a moving particle. How do we understand Distance? To calculate displacement, the direction is taken into consideration. Distance travelled is a scalar quantity while displacement is a vector quantity. 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). A body is said to be accelerating if its velocity is changing. 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. 1. 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. 3. A body is said to have non-uniform acceleration if its velocity increases or decreases by unequal amount in equal intervals of time. Distance is the actual length of the path travelled by the particle in a given interval of time. We use the terms speed and velocity in everyday usage, but it does not mean very different to us. Distance between a given set of initial and final position can have infinite values. Distance depends upon the path i.e. retardation). Displacement is the direct length between any two points when measured along the minimum path between them. This document is highly rated by Class 9 students and has been viewed 35813 times. We can define speed as a function of distance traveled whereas velocity is a function of displacement. What do you think is the definition or the difference between saying the distance something traveled versus its displacement? A car moving on a circular road with constant speed. Check the related articles below to learn additional topics related to displacement and distance. What conclusion do you draw about acceleration of the object? We can define distance as to how much ground an object has covered despite its starting or ending point. What are distance and displacement? Watch this video to know more! 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. 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. 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