1. Science Starter! With a partner, review: - Homework 2 (Conversions and Dimensional Analysis worksheet)

2. Representing Motion Chapter 2

3. Important Terms Scalar: quantities, such as temperature or distance, that are just numbers without any direction (magnitude) EX: 15 m, $5.50, 98° Vector: quantities, such as position, that have both magnitude and direction EX: 15 m North, - 5 ft, 4 cm down

4. Distance: a scalar quantity that describes how far an object has traveled Symbol: “x” or “y” Units: m (meters) Displacement: a change in position having both magnitude and direction; it is equal to the final position minus the starting position Symbol: “Δ x” or “Δ y” Δ (delta) :“change in” Units: m How far?

5. EX: Joey runs 400 m around the track and finishes exactly where he started. What is Joey’s: (a)distance traveled? (b)displacement?

6. How fast? Average Speed: total distance traveled in a time interval (scalar) Symbol: v Units: m/s (meters per second) Average Velocity: displacement traveled in a time interval (vector) Symbol: v Units: m/s

7. Representing Motion ( pg 32 )

9. Particle Models Object moves with constant velocity (speed) for 4 seconds. Constant Velocity (speed): Same displacement (distance) traveled in the same time interval.

10. Graphing Particle Models Time (s) Position (m) 00 110 220 330 440