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# 1 Measuring Motion

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### 1 Measuring Motion

1. 1. Measuring Motion
2. 2. How do you know something is moving? <ul><li>An object in outer space appears to be stationary in space. How can we tell it is moving or not moving??? </li></ul><ul><li>Do these answers work for determining is something is moving on Earth? </li></ul>
3. 3. Point of reference <ul><li>An object that stays in place compared to an object that is moving. </li></ul><ul><li>Examples: North Star, mountains on Earth, buildings, trees, etc </li></ul>
4. 4. Motion <ul><li>An objects change in position relative to a reference point. </li></ul>Time = x-axis Distance = y-axis .
5. 5. This line is not horizontal (at rest)
6. 8. Speed Vs. Velocity <ul><li>Speed = Rate at which distance changes over time. S = D/t </li></ul><ul><li>Velocity = speed with direction V = D/t with a direction (right, left, north, south, negative, positive) </li></ul>
7. 9. Example <ul><li>A bus moves a distance of 150 m East in 10 seconds. </li></ul><ul><ul><li>What is the bus’s average speed? </li></ul></ul><ul><ul><li>What is the bus’s average velocity? </li></ul></ul><ul><ul><li>What are the passengers on the bus’s average velocity (assume no passengers are moving)? </li></ul></ul><ul><ul><li>If a passenger stands up and starts moving 1 m/s East, what is the passengers total velocity? </li></ul></ul><ul><ul><li>If another passenger stands up and starts moving 1 m/s West what is the passengers total velocity? </li></ul></ul>
8. 10. <ul><li>S = 150 m/10 s Speed = 15 m/s </li></ul><ul><li>V = 150 m/10 s Velocity = 15 m/s East </li></ul><ul><li>Passengers on the bus move at the same rate as the bus as long as it is not moving. (15 m/s East) </li></ul>D. 15m/s East + 1 m/s East = 16 m/s East E. 15 m/s East – 1 m/s West = 14 m/s East
9. 11. Acceleration <ul><li>The rate at which velocity changes over time </li></ul><ul><li>Avg Acceleration = Final Velocity – Starting Velocity </li></ul><ul><li> time it takes to change velocity </li></ul>What is the bicyclist’s acceleration?
10. 13. Velocity Versus Time Graph <ul><li>What is happening from 0 seconds to 8 seconds? </li></ul><ul><li>What is happening from 8 to 10 seconds? </li></ul><ul><li>What happens at exactly 8 seconds? </li></ul><ul><li>What happens to this person’s position from 0 –10 seconds? </li></ul>
11. 14. Circular Motion <ul><li>Objects moving in circle always change direction, velocity, and acceleration </li></ul>Black arrow indicates direction of motion and velocity. Blue arrow indicates acceleration.