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# 11 1 Distance And Displacement

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### 11 1 Distance And Displacement

1. 1. Chapter 11 Motion 11.1 Distance and Displacement
2. 2. 11.1 Frame of Reference <ul><li>= Is a system of objects that are not moving with respect to another object.  </li></ul><ul><li>= Needed to describe motion completely and accurately </li></ul><ul><li>**Students Describe where something is in the room without using a frame of reference** </li></ul>
3. 3. Relative Motion — <ul><li>Movement in relation to a frame of reference </li></ul><ul><li>Ex. People on a train seem to not be moving when looking at each other </li></ul><ul><li>People on platform waiting for the train will say the train is moving fast </li></ul><ul><li>Choosing a meaningful frame of reference allows you to describe motion in a clear and relevant manner. </li></ul>
4. 4. Displacement Vs. Distance <ul><li>Distance = is the length of path between two Points </li></ul><ul><li>Displacement = the direction and the length of a straight line from the starting point to the ending point. Measured in metric </li></ul>A B
5. 5. Vector <ul><li>Vector = has a magnitude and a direction </li></ul><ul><li>= Can be size, length, or amounts </li></ul><ul><li>= Arrows on a map </li></ul><ul><li>= Size of arrows shows magnitude </li></ul><ul><li>= Vectors can be combined </li></ul>
6. 6. Vector <ul><li>Vectors will show: Actual Movement </li></ul><ul><li>How far you actually went </li></ul><ul><li>Vectors will show: Displacement </li></ul><ul><li>How far from the start point you are </li></ul>
7. 7. Combined Vectors: <ul><li>Vectors in the same direction can be added   </li></ul><ul><li>3cm + 5 cm = 8cm </li></ul><ul><li>Vectors in opposite direction can be subtracted   </li></ul><ul><li>7cm – 2cm = 5cm </li></ul>
8. 8. Displacement That Isn’t Along a Straight Path <ul><li>Two or more displacement vectors have different directions…they may be combined by graphing </li></ul><ul><li>Similar to drawing a map with direction to school from your home. </li></ul><ul><li>How many miles exact path or how many miles as straight as the arrow flies? </li></ul>