2. Physics: Speed and Velocity

3. Average Speed  Rate at which an object moves  Units are in distance / time  Ex. Meters/second, centimeters/hour

4. Units of Distance  Miles (mi)  Centimeters (cm)  Feet (ft)  Light year (Ly)  Meters (m)

5. Units of Time  Seconds (s)  Hours (hr)  Minutes (min)  Years (yr)

6. Equation for Average Speed  Speed =  d/  t = change in distance/change in time

7. VELOCITY  Velocity is speed with a direction  Ex. A car is traveling 12 mph west  V =  d /  t = change in position/ change in time

8. Uniform Motion  Motion at a constant speed and direction  Also called “constant velocity”

9. Instantaneous Speed  Speed of an object at a particular moment or “instant” of time  Ex. Reading on a speedometer

10. Graphs of Speed/ Velocity  Constant velocity  Slope gives you velocity

11. Speed Graphs cont’d  Increasing Speed

12. d(m) t(s) A Object is not moving, speed is 0