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# Distance and displacement in one dimension

Using a one-dimensional number line to visualize and calculate distance and displacement. Created by Sal Khan.

## Want to join the conversation?

• first thank you very much for creating these videos for us. I'm currently in physical science but i've always wanted to learn physics. also i want to ask is all of this going to get any harder than it is right now?
• Oh yeah bud. More complex and more interesting, too.
• what is symbol of distance and displacement ?
• Distance is denoted by "d" while most of the books use "x" or "s" for displacement
• Displacement Sum of all vectors
Distance Sum of the Absolute value of all vectors
Is this another way to define the difference?
• Distance is the actual path travelled in a given time interval.
Displacement is the difference between the initial and final point of an object at a given time interval.
• What is net displacement? Thanks.
• It is s=vt or displacement equals velocity multiplied by time.
• How does the lemon move?
• Although this is unnecessary to the actual problem, a lemon can move in many ways, for example, having someone move it. However, it is extremely important to state that a lemon is an arbitrary object, and its being a lemon does not affect the way it moves. Thank you.
• Why is it called net displacement?
• It is called net displacement because it is the overall change in position. You would get this by subtracting the initial position from the final position.
• Can we write displacement -2 as 2 to the left
• Yes, that is a another way to write it because both ways explain the direction not just the change in position.
(1 vote)
• Wait a sec... How did he make the -3 and -1 positive and add them up and say that the distance traveled is 6 units?
• He was talking about distance, which is the magnitude of how far something travels (always positive). So while he could have had a positive or negative displacement (distance from origin), his total distance traveled would be a positive value coming from the sum of the absolute values of the distances he walked. -3 becomes 3, -1 becomes 1, and 2 stays 2. 3+1+2=6