7 differences between distance and displacement practice
So some of you all might have said that the sheep traveled 25 kilometers. If that's what you came up with, what you calculated is the total distance traveled. Now, some of you might have said, wait, hold on a second, the sheep was here before and then it ends up right over here at the end of its journey and so its change in position is it would have moved a net five kilometers south.
From this point to this point would have been five kilometers south. It doesn't matter what it did along the way, what its path was. At the end of the day, it ended up five kilometers south of where it started out and this would also be a valid way of saying how far it traveled and this notion is known as displacement. So the displacement would be in this situation five kilometers south.
So pause this video. What do you think is the definition or the difference between saying the distance something traveled versus its displacement? Well, as we mentioned, the distance something travels is the entire length of its journey. It's the entire path and this thing will never be negative.
You could travel zero kilometers but as long as you are, your position keeps changing, this thing will only increase because it's the total length of your path. Your displacement is your change in position and since it's a change in position, not only will we mention the five kilometers, we'll say in what direction. The position of the sheep has changed five kilometers to the south. You can also tell in what direction something is moving in the classroom. If you remained seated as your classmates left the room, you would measure their movement away from your stationary location.
If you and your classmates left the room together, then your perspective of their motion would be change. You, as the reference frame, would be moving in the same direction as your other moving classmates. As you will learn in the Snap Lab, your description of motion can be quite different when viewed from different reference frames. Relate this to the origin of a coordinate grid. Engage students in a discussion of how it is the difference in motion between the reference frame of the observer and the reference frame of the object that is important in describing motion.
The reference frames used in this chapter might be moving at a constant speed relative to each other, but they are not accelerating relative to each other. Demonstrate the difference by having one student stand at the front of the class. Explain that this student represents the background. Walk once across the room between the student and the rest of the class. Ask the student and others in the class to describe the direction of your motion.
The class might describe your motion as to the right, but the student who is standing as a background to your motion would describe the motion as to the left. Conclude by reminding students that the reference frame is the viewpoint of the observer, not the background. For example, slide a book across a desk. Ask students to describe its motion from their reference point, from the book's reference point, and from another student's reference point.
Which reference frame is correct? Stand a couple of meters away from your partner. Have your partner begin bouncing the basketball while standing in place. Describe the motion of the ball. Next, have your partner again bounce the ball, but this time your partner should walk forward with the bouncing ball. You will remain stationary. Describe the ball's motion. Again have your partner walk forward with the bouncing ball.
Switch places with your partner, and repeat Steps 1—3. Grasp Check How do the different reference frames affect how you describe the motion of the ball? The motion of the ball is independent of the reference frame and is same for different reference frames.
The motion of the ball is independent of the reference frame and is different for different reference frames. The motion of the ball is dependent on the reference frame and is same for different reference frames.
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Example1: A car moves 4 kms to the east and then turns and moves 2 Kms to the south, then again takes a turn moves 4 Kms to the west and then turns towards the north to move 2 Kms and reaches the point she started. Let us find out what is the distance travelled and the displacement. The above figure represents the motion of the car. The displacement is 0. Now, the displacement is 0 because the car covered a path of 12 km during the travel, but it was not out of place when the car finished.
It is in the same place where it started, so there is no displacement of motion. When we focus our attention on the direction, we notice that the 4 km travelled to the east is cancelled by the 4 Km travelled to the west, and similarly, 2 Km travelled to the south is cancelled by the 2 km travelled the north. So, direction plays an important role in calculating displacement as it is a scalar quantity.
Similarly, while calculating distance, the direction of the car can be ignored. Example 2: A person walks for m in a straight line to participate in a race. He starts from the start point and ends at the finish point. The person walks in a straight line in one direction and finishes the race. In this example, the distance and displacement of the person are equal to m.
Let us calculate the distance covered and displacement of the bus. The displacement of the car is km. Thus, distance is how much path the object has covered, and displacement is how far the object has moved from its place. Definition of displacement Displacement means the change of position of someone or something, in a particular direction. It is the shortest length measured from its initial position to the final position of the moving body.
It is a vector quantity, so it takes into account both the magnitude and the direction of the object. The magnitude of the displacement refers to the linear distance between two points. In general, the measurement of displacement is done along a straight line, although its measurement can also be done along curved paths. In addition, it is carried out considering a reference point.
Key differences between distance and displacement The following points explain the differences between distance and displacement: The amount of space between two points, measured along the actual path, that connects the two points, is called the distance. The amount of space between two points, measured along the minimum path connecting them, is called the offset. Distance is nothing more than the length of the total path traveled by the object during movement. On the other hand, the offset is the shortest distance between the start point and the end point.
The distance provides the complete information of the path followed by the body. In contrast, scrolling does not provide complete information on the path traveled by the object. Displacement decreases with time, while distance does not decrease with time. The offset value can be positive, negative, or even zero, but the distance value is always positive.
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The magnitude of displacement refers to the linear distance between two points. In general, measurement of displacement is done along the straight line, although, its measurement can also be done along curved paths. Further, the measurement is done considering a reference point. Key Differences Between Distance and Displacement The following points explain the differences between distance and displacement: The amount of space between two points, measured along the actual path, which connects the two points, is called distance.
The amount of space between two points, measured along the minimum path which connects them, is called displacement. Distance is nothing but the length of the total route travelled by the object during motion. On the other hand, displacement is the least distance between starting and finishing point. Distance gives the complete information of the path followed by the body. As against this, displacement does not give the complete information of the path travelled by the object.
Displacement decreases with time, whereas distance does not decrease with time. The value of displacement can be positive, negative or even zero, but the value of the distance is always positive. Distance is a scalar measure, which takes into account the magnitude only, i. Unlike displacement which is a vector measure and takes into account both magnitude and direction.
For example, if a bus travels north for 5 Kms and takes a turn to travel east for another 5 Kms, the complete distance travelled by bus is 10 Kms. Distance is always more than displacement. The value of distance can never be zero or negative. Distance of the object gives complete information of the path travelled by the object. Displacement: Displacement of the object is defined as the minimum distance travelled by the object between the starting point of the object and the final point of the object.
For example, if we consider the last example of a bus travelling 5 Kms north and then 5 Kms east, the total displacement will be the length joining the two points. Let us check our understanding with some simple examples. Example1: A car moves 4 kms to the east and then turns and moves 2 Kms to the south, then again takes a turn moves 4 Kms to the west and then turns towards the north to move 2 Kms and reaches the point she started.
Let us find out what is the distance travelled and the displacement. The above figure represents the motion of the car. The displacement is 0. Now, the displacement is 0 because the car covered a path of 12 km during the travel, but it was not out of place when the car finished.
It is in the same place where it started, so there is no displacement of motion. When we focus our attention on the direction, we notice that the 4 km travelled to the east is cancelled by the 4 Km travelled to the west, and similarly, 2 Km travelled to the south is cancelled by the 2 km travelled the north. So, direction plays an important role in calculating displacement as it is a scalar quantity.
Similarly, while calculating distance, the direction of the car can be ignored.
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