# Chapter 2: Representing Motion - Yola Chapter 2: Representing Motion Pg. 30 Launch Lab/demonstration What data did you collect to show which car was faster?

What other data could you collect to determine which car is faster Put toys into motion categories How would you categorize these toys based on motion?

Motion How do you know something is moving? What evidence would it take to convince them that something is moving?

Frame of Reference and Reference Points What is frame of reference? What is a reference point? (show video from online activity)

Various kinds of motion Throwing a touchdown football pass Bowling Bicycle wheel going around in a circle

Where do we start in physics??? Linear Movement Movement in a straight line is the most basic Sometimes represent motion in a motion diagram

Draw a motion diagram and particle model below Coordinate Systems pg. 34 How do you explain to get to your house to someone who is not from town.

What reference points did you use to explain where you house is? Coordinate Systems Coordinate system

Origin Position distance Position does not equal Distance How are they different??? Examples-

Vectors and scalars Magnitude Vector Scalar Resultant Adding vectors = place them tip to

tail Tinkering with vectors lab Materials (lumps of clay/play do and straws) Distance and Displacement

Are they the same??? Think about going from this classroom to the library, how many possible ways can you get from here to there? Are all the ways the same distance? Do you have the same displacement?

Time Interval & Displacement t = tf ti The time interval is equal to the final time minus the initial time d = df di

Displacement is equal to the final position minus the initial position Subtracting Vectors A B = A + (-B) Draw the figure in textbook

Position vs. Time graphs 2.3 Pg. 39 Practice Problems (9-13) Instantaneous position The position at a particular instant

Practice problems pg. 41 Note: At what time do A and B have the same position? Why did you start the origin at where you did? What would happen if you choose runner Bs

start as the origin; what would A position be? 14-18 How Fast??? Watch-They Might Be Giants Speed vs. Velocity

What is speed; what is velocity? Average Velocity Average Velocity Calculate average velocity from figure 2-20 on page 43.

Practice problems pg. 45