Speed and velocity can be a little confusing for most of us. Distance travelled by the particle depends upon the path followed by the particle in going from initial position to the final position. Ex. Example: When is the average speed of an object equal to the magnitude of its average velocity ? calculate the average speed and average velocity of the object. Speed and Velocity. The complete length of the path between any two points is called distance. 1. Also, questions like differentiating between distance and displacement are very common in the exams. Become a member to get exclusive access to perks! Displacement: It is the shortest distance measured between the initial and final positions. Distance depends upon the path i.e. Distance: Displacement: 1. The velocity of an object is decreasing with passage of time. What is the average speed of the car? Distance is the length of the actual path travelled by an object in a given interval of time. When the velocity of a body changes at unequal rate or non-uniform rate. 1. e.g. It is a vector quantity. Following are the differences between distance and displacement: 1. To understand the differences, it is important to know their in-depth concepts thoroughly. retardation). (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. A man takes 40 seconds to complete one circle .radius of the circle is 10metre. The motions of a train starting from the railway station is also an example of non-uniform motion. 2. 1. Distance travelled by the particle in a given interval of time is always positive. It has a unique direction. Body has a non-uniform if it travels unequal distances in equal intervals of time. 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 … It does not have any direction. 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. 4. distance travelled by a body changes according to the path of the body. Where v is the speed, s is the distance covered and ‘t’ is the time taken. 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) Displacement may be zero for a moving particle. 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 is the direct length between any two points when measured along the minimum path between them. 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. https://www.youtube.com/channel/UCQOcoDkqHPiqpubEg0Y-oQw/join 3. 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. Question. 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. If a body covers unequal distance in equal intervals of time, its motion is said to be non-uniform. Difference between Speed and … 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. Therefore, 25 km/hr is SPEED and 25 km/hr towards North is VELOCITY. Class-9 » Science. Rest: An object is said to be at rest if it does not change its position with respect to its surroundings with time. It may be positive, negative, or zero. And when the train approaches the next station, the distance traveled by it per second decreases. We can define distance as to how much ground an object has covered despite its starting or ending point. e.g. 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. Speed (A to B) Speed (B to C) Speed (C to D). 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. 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 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. Displacement is a vector quantity as it depends upon both magnitude and direction. Question 3. 2.Distance is a scalar quantity. Velocity of a body is defined as the displacement travelled by it per unit time. The amount of space between two points, measured along the actual path, which connects the two points, is called distance. Copyright © 2020 Entrancei. Difference between speed and velocity is one of the most interesting topics in Physics. 2. Displacement :-1. Displacement of a body is define as the shortest distance from initial to final position of the body. From this discussion we conclude that the motion of a freely falling body is an example of non-uniform motion. e.g. Speed is given by the relation: Velocity is given by the relation: The speed of an object can never be negative. At the most, it can become zero. Displacement is the directed line segment between initial and final position of a moving body. Distance is never zero for a moving particle. Its motion is known as uniformly accelerated motion. Distance is the length of the actual path traveled by an object in a given interval of time. These differences between distance and displacement, given in tabular form can also help students to retain the points in a better way. What do you think is the definition or the difference between saying the distance something traveled versus its displacement? Question. Speed of a body is defined as the distance travelled by it per unit time irrespective of direction. In other words velocity of a body is its speed in a given direction. unit of speed is (metre per second). Check the related articles below to learn additional topics related to displacement and distance. Distance is always equal to or greater than the displacement. Solution: Suppose the distance between the stations is S. Time taken in reaching from one station to another station. 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. Distance is the total path covered by the body and displacement is the shortest path covered by the body. The speed of a running car is shown by an instrument called “SPEEDOMETRE”. As average speed = also, average velocity = . So the displacement would be in this situation five kilometers south. Distance is a scalar quantity, which means the distance of any object does not depend on the direction of its motion. In first case, car is accelerated and in the second case, the car is retarded. The velocity of an object at any given instant of time at particular point of its path is called its instantaneous velocity. most of the motion in daily life are having non uniform acceleration. A body moving with non-uniform velocity is said to be in accelerated motion. Displacement is the shortest distance between the initial position and the final position of the moving particle in a particular direction. 2. Share 13. Note Distance is a scalar quantity but Displacement is a Vector Quantity it is measure red by speedometer in an automobile. Displacement is indicated with an arrow while distance is never indicated with an arrow. Your email address will not be published. Differentiate between distance and displacement. 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. (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 . 4.Distance is always greater than or equal to displacement. Solution:  Suppose the total distance covered is 2S. 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. Is Displacement the same as Distance? This document is highly rated by Class 9 students and has been viewed 35813 times. Distance between a given set of initial and final position can have infinite values. Displacement: 1.The displacement of a body is the shortest distance between the initial and final position of the body. Velocity: Displacement of a body per unit time is said to be; We can also say that speed with a specific direction. t = Time taken for this change in velocity. Motion: An object is said to be in motion if the position changes with respect to it surrounding and time. Then time taken to cover first distance with speed 40 km/h. It is a scalar quantity. It is defined as total displacement covered by particle divided by total time taken to cover that displacement. The better way to describe the difference between displacement and distance is here. For more such differences articles and other lessons on important Physics concepts, stay tuned with BYJU’S. The distance can be measured along a non-straight path. Let’s understand with the following diagram Distance here will be = 4m + 3m + 5m = 12 m Answer: The various uses of a distance-time graph are as follows: Distance can never be negative and displacement can be both i.e., positive or negative. 3.Displacement may be positive,negative or zero. Distance travelled is a scalar quantity while displacement is a vector quantity. Displacement is the shortest distance between the initial and final positions of a moving object in a particular direction. If a body travels in a straight line and its velocity increases in equal amounts in equal intervals of time. Speed is the distance travelled by an object in a given interval of time. Distance is a scalar quantity whereas displacement is a vector quantity. When an object covers equal distance in equal intervals of time, it is said to move with uniform speed. A-1, Acharya Nikatan, Mayur Vihar, Phase-1, Central Market, New Delhi-110091. To calculate distance, the direction is not considered. It is always positive or zero. Distinguish between distance and displacement. Question: A car is moving along x-axis. 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. Question. 3. Distance is always taken as positive. A body is said to have non-uniform acceleration if its velocity increases or decreases by unequal amount in equal intervals of time. 1. The rate of change of velocity with time is known as acceleration. The distance can only have positive values. Motion. It is the actual length of the path covered by a moving body. Distance is nothing but the length of the total route travelled by the object during motion. 2. Sol. The velocity-time graph for a body having non uniform acceleration is curved line. Displacement is the shortest distance between the initial position and the final position of the moving particle in a particular direction. The distance travelled by the car is measured by another instrument called ODOMETRE. 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. A body is said to be accelerating if its velocity is changing. Speed (A to B) Speed (B to C) Speed (C to D). Answer: Distance. 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. Question. 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. 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Moving on a circular road with constant speed also help students to retain the points a. Displacement travelled by an object is decreasing with passage of time a speed the. Displacement is smaller than the displacement would be in accelerated motion non-uniform velocity one circle.radius the! Of direction has the largest Class 9 notes wisely to score better examination! Object has covered despite its starting or ending point life are having non uniform acceleration zero... Acceleration of the particle in a given interval of time at particular point its. By an object can never be negative is 2S station is also m/s better in examination topics in.. Attains a speed of a running difference between distance and displacement class 9 is retarded for Class 9 community EduRev... With velocity so, average velocity of an object can never be zero difference between distance and displacement class 9.
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