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Agenda 1) Warm-Up 5 min 2) Physics Vocab. Words 10 min 3) Binder Set-up 5 min 4) Review for Quiz 15 min 5) Vector Notes 10 min 6) Speed & Velocity WS II 40 min 09 -02- 11 Add the two magnitudes. North

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1.Relative: Motion is relative; all measurements are measured from a starting point, reference point. Every measurement is measured relative to this point. 2.Rate: a quantity divided by time 3.Scalar: a quantity, like distance, only magnitude or size. 4.Vector: a quantity, that has magnitude and direction

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In front of dividers: Homework chart (orange) Formula chart (purple) Syllabus Lab Safety Rules Coupon (green) Notes/Handouts Distance & Displacement Notes II Distance & Displacement Notes I Physics Vocab. Chart Sig. Fig Handout Linear Motion Notes “About Science” Notes Quizzes Daily Work Labs Misc.

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Review Linear Motion Review Linear Motion Speed & Velocity Distance & Displacement

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Distance and Displacement Distance and displacement are two quantities which may seem to mean the same thing, yet they have distinctly different meanings and definitions. Distance (d) is a scalar quantity which refers to "how much ground an object has covered" during its motion. Displacement (d) is a vector quantity which refers to "how far out of place an object is from its original position"; it is the object's change in position.

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Even though the physics teacher has walked a total distance of 12 meters, her displacement is 0 meters. Yet, when she is finished walking, she is not "out of place" – i.e., there is no displacement for her motion (displacement = 0 m). Displacement, being a vector quantity, must give attention to direction. The 4 meters east is canceled by the 4 meters west; and the 2 meters south is canceled by the 2 meters north.

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Location of the object at a specific time Position final - Position inital = displacement

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You drive the path, and your odometer goes up by 8 miles (your distance). Your displacement is the shorter directed distance from start to stop (yellow arrow). start stop

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Explanation The most important distinction between “distance” and “displacement” is that distance is a scalar and displacement is a vector. Scalars are simple magnitudes. ___You fill in_____ ________________ Vectors contain information about the magnitude (size) and direction of a physical observable. __________________

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Evaluation

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Conclusion Distance is the length of the path traveled. Displacement is the length and direction of a line from start to finish. Position is a location relative to a point of reference. Motion is a change in position. Displacement is a vector quantity that contains both magnitude and direction.

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Speed = Distance Time If a runner travels 100 m in 10 seconds what was his average speed? Can solve for the other pieces too Distance = speed x time Time = Distance Speed

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Vectors

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How do we draw forces? With VECTORS Directions of vectors are usually defined as North, South, East, West

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An arrow is used to depict a vector. The arrow’s length represents the magnitude of the vector. The arrow points in the Direction of the magnitude

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How do you get the resultant when we have 2 vectors going in the same direction ADD their magnitudes How do you get the resultant when we have 2 vectors going in the same direction SUBTRACT their magnitudes

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This “New Vector” is the Net Vector or RESULTANT

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Draw vectors & solve the following: Determine the total displacement of a person moving 5.5m West, then 6.3m East 5.5 m 6.3 m.8 m

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Determine the total displacement of a person that is moving 4.5 m West, 5.6 m East and 8.1 m West.

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DUE TODAY: Vocab. Chart (KEEP) Distance & Displacement Notes II (KEEP) DUE NEXT CLASS: CALCULATOR Binder/folders/CALCULATOR STUDY FOR QUIZ STUDY FOR QUIZ Speed & Velocity WS II Speed & Velocity WS II “One's mind, once stretched by a new idea, never regains its original dimensions.” Oliver Wendell Holmes

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