Agenda Warm-Up 5 min Physics Vocab. Words 10 min Binder Set-up 5 min LEARNING GOALS: A Scalar quantity has magnitude only. A Vector quantity has both magnitude and direction. Displacement is a change in position. Velocity is a change in displacement. 09 -02- 11 WARM-UP: 1) If vectors point in the same direction, , then how do you calculate the resultant? 2) This vector is pointing in which direction?  Agenda Warm-Up 5 min Physics Vocab. Words 10 min Binder Set-up 5 min Review for Quiz 15 min Vector Notes 10 min Speed & Velocity WS II 40 min Add the two magnitudes. North HOMEWORK DUE: Contracts & Folders

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

Binder set-up 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.

Homework due September 6/7 1) Speed & Velocity WS II 2) Study for Quiz on 9/6 (A) 9/7 (B)

Review Linear Motion Speed & Velocity Distance & Displacement Unit 1.3 Review Linear Motion Speed & Velocity Distance & Displacement

Distance and Displacement?

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.

Equal & Opposite Vectors Example A physics teacher walks 4 meters East, 2 meters South, 4 meters West, and finally 2 meters North. 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. Equal & Opposite Vectors

Position Location of the object at a specific time Positionfinal - Positioninital = displacement

Distance vs. Displacement 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

What’s your Vector 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. __________________ Have students list scalar quantities Money, Time, Energy, Objects, etc… From Geometry, what would we call a line that starts at a point, has a certain length, and points in one direction: ray 06/14/05

Distance vs. Displacement Evaluation Distance vs. Displacement Have students measure both distance and displacement on the treasure map (They will have to create a legend) 06/14/05

Summary of Concepts Distance is the length of the path traveled. Conclusion Summary of Concepts 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. Slowly reiterate the important points and ask for questions. Remember to wait at least 3 seconds before moving on. Ask if there are any new vocabulary words that need to be redefined or written on the board (we all have to speak the same language) 06/14/05

Speed is the distance traveled by a moving object over a period of time

Velocity is speed in a given direction

Calculating Speed 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

Chapter 4 Vectors

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

An arrow is used to depict a vector. VECTORS 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

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

This “New Vector” is the Net Vector or RESULTANT

Draw vectors & solve the following: Example 1 Draw vectors & solve the following: Determine the total displacement of a person moving 5.5m West, then 6.3m East .8 m 5.5 m 6.3 m

Example 2 (Write it down) Determine the total displacement of a person that is moving 4.5 m West, 5.6 m East and 8.1 m West.

Homework due September 5/6 1) Speed & Velocity WS II 2) Study for Quiz on 9/5 (A) 9/6 (B)

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