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# 1 motion and speed

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### 1 motion and speed

1. 1. Motion and Speed
2. 2. <ul><li>Motion - a change in position. </li></ul><ul><li>A reference point is needed to know if the position has changed. </li></ul><ul><li>Speed - the rate of change in position…rate of motion. </li></ul>
3. 3. <ul><li>There are several ways to measure speed. </li></ul><ul><li>Instantaneous speed- rate of motion at any given instant. </li></ul><ul><li>Ex: speedometer </li></ul><ul><li>2. Constant speed- speed that does not change. </li></ul>
4. 4. <ul><li>3. Average speed- total distance traveled divided by the total time of travel. This is the best way to describe speed when the rate of motion changes. </li></ul>
5. 5. Speed Equation <ul><li>Variable Ending Units </li></ul><ul><li>d = distance meter or kilometer </li></ul><ul><li>t = time sec . or hr . or min . </li></ul><ul><li>s = speed meter/sec . or </li></ul><ul><li>(or v) kilometer/hr . </li></ul>
6. 6. <ul><li>d = s (v) X t </li></ul><ul><li>t = d / s (v) </li></ul><ul><li>s (v) = d / t </li></ul>d s (v) t X . . . .
7. 7. <ul><li>Ex: A passenger elevator operates at an average speed of 8 m/s. If the 60 th floor is 219m above the first floor, how long does it take the elevator to go from the first floor to the 60 th floor? </li></ul>
8. 8. <ul><li>Ex: A motorcyclist travels an average speed of 20 km/h. If the cyclist is going to a friend’s house 5 km away, how long does it take the cyclist to make the trip? </li></ul>
9. 9. <ul><li>Ex: Sound travels at a speed of 330 m/s. If a lightning bolt strikes the ground 1km away from you, how long will it take for the sound to reach you? (Watch out for this one!!!) </li></ul>