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Displacement (geometry)

math Maturity 9-11 Next article →

Imagine you are moving from one spot to another. Displacement is the math word for that change in location. It is not just about how far you went. It also tells you which way you moved. In geometry, we call this a vector. A vector is a tool that shows both size and direction. Displacement is the shortest path between your start and your end.

To find displacement, you look at two points. We call the first point the initial position. The second point is the final position. Displacement is the straight line between them. It shows the net or total motion of an object. You can think of it as a shift in place. This shift maps the start to the finish.

Math helps us understand how things move over time. If you know the displacement, you can find velocity. Velocity is how fast the position changes. To find average velocity, you divide displacement by time. This also gives you the average speed. Speed is a different kind of measurement. It only tells you how fast you move, not the direction.

Some things move in more than one way. A solid object, called a rigid body, can do many things. It can move along a straight line. This is called linear displacement. It can also spin or turn. We call that spin angular displacement.

Math also looks at how these moves change. The first change is velocity. The next is acceleration. There is even a fourth change called jounce.

Sometimes we measure motion from a moving place. Imagine a person walking on a moving train. Their speed looks different depending on where you stand. This is called relative velocity. It is measured from a moving starting point. We also use absolute velocity. This is measured from a spot that stays still. A person on a train station floor would see absolute velocity.

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