1. Motion Describing & Measuring Motion Chapter 1 Section 1

2. Motion When an object’s distance from another object is changing –Its all Relative!!! Earth moves at ~100,000 km/hr around the sun

3. Reference Point A place or object used to determine if something else is in motion

4. International System of Units SI Units –Based on the number 10 1 meter = 10 decimeters 1 meter = 100 centimeters 1 meter = 1,000 millimeters 1 kilometer = 1,000 meters

5. Describing Distance SI unit for length is… –Meters Kilo- –1000x Centi- –1/100 th Milli- –1/1000 th

6. Calculating Speed The distance an object travels, divided by the time it took –V=d/t U.S. –Miles Per Hour Mph Rest of the world –m/s –Km/hr

7. Constant vs. Average Speed Constant Speed –Never changes Cruise control Average Speed –The total distance divided by total time

8. Describing Velocity The object’s… –Speed –Direction Tornado’s speed –30 km/hr Tornado’s velocity –30 km/hr NE

9. Graphing Motion Constant Motion Acceleration Deceleration Stopped Moving Forward Moving Backward