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# 11 1 Distance And Displacement

## on Dec 15, 2009

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## 11 1 Distance And DisplacementPresentation Transcript

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