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Motion 1

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• Motion 1

1. 1. Motion & Forces <ul><li>To describe Motion, we use these main terms: </li></ul><ul><ul><ul><ul><li>Motion </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Speed / Velocity </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Acceleration </li></ul></ul></ul></ul>
2. 2. A. Motion <ul><li>Problem: </li></ul><ul><ul><li>Is your desk moving? </li></ul></ul><ul><li>We need a reference point ... </li></ul><ul><ul><li>A nonmoving point from which motion is measured (you have to have one to measure motion!) </li></ul></ul>
3. 3. A. Motion <ul><li>Motion </li></ul><ul><ul><li>Change in position in relation to a reference point. </li></ul></ul>Reference point Motion
4. 4. A. Motion <ul><li>Problem: </li></ul><ul><li>You are a passenger in a car stopped at a stop sign. Out of the corner of your eye, you notice a tree on the side of the road begin to move forward. </li></ul><ul><li>You have mistakenly set yourself as the reference point. </li></ul>
5. 5. B. Speed & Velocity <ul><li>Speed </li></ul><ul><ul><li>Is the rate of motion </li></ul></ul><ul><ul><li>The distance traveled per unit time </li></ul></ul>s d t
6. 6. B. Speed & Velocity <ul><li>Instantaneous Speed </li></ul><ul><ul><li>speed at a given instant </li></ul></ul><ul><li>Average Speed </li></ul><ul><ul><li>we tend to use average speed… why? </li></ul></ul>
7. 7. B. Speed & Velocity <ul><li>Problem: </li></ul><ul><ul><li>A storm is 10 km away and is moving at a speed of 60 km/h. Should you be worried? </li></ul></ul><ul><ul><li>It depends on the storm’s direction! </li></ul></ul>
8. 8. B. Speed & Velocity <ul><li>Velocity </li></ul><ul><ul><li>is essentially the same thing as speed, but in a given direction </li></ul></ul>
9. 9. B. Resultant Velocity <ul><ul><li>combining 2 or more velocities together </li></ul></ul><ul><ul><li>if 2 velocities are in the same direction, add them together </li></ul></ul><ul><ul><li>if 2 velocities are in opposite directions, subtract the smaller velocity from the larger velocity, and use the direction of the larger velocity </li></ul></ul>
10. 10. B. Resultant Velocity <ul><li>Think about a moving sidewalk… If you walk with the sidewalk, you walk faster than when you just ride the sidewalk, which is faster than if you were walking opposite to the moving sidewalk </li></ul>
11. 11. C. Calculations <ul><li>Your neighbor skates at a speed of 4 m/s. You can skate 100 m in 20 s. Who skates faster? </li></ul>GIVEN: d = 100 m t = 20 s s = ? WORK : s = d ÷ t s = (100 m) ÷ (20 s) s = 5 m/s You skate faster! s d t
12. 12. C. Calculations <ul><li>Sound travels 330 m/s. If a lightning bolt strikes the ground 1 km away from you, how long will it take for you to hear it? </li></ul>GIVEN: s = 330 m/s d = 1km = 1000m t = ? WORK : t = d ÷ s t = (1000 m) ÷ (330 m/s) t = 3.03 s s d t
13. 13. C. Calculations <ul><li>You are traveling at an average speed of 60 miles per hour. In 1.3 hours, how far can you travel? </li></ul>GIVEN: s = 60 mph t = 1.3 hours d = ? WORK : d = s x t d = (60 mph) x (1.3 hrs.) d = 78 miles s d t
14. 14. D. Graphing Motion <ul><li>slope = </li></ul><ul><li>steeper slope = </li></ul><ul><li>straight line = </li></ul><ul><li>flat line = </li></ul>faster speed constant speed no motion speed Distance-Time Graph A B
15. 15. D. Graphing Motion <ul><li>Who started out faster? </li></ul><ul><ul><li>A (steeper slope) </li></ul></ul><ul><li>Who had a constant speed? </li></ul><ul><ul><li>A </li></ul></ul><ul><li>Describe B from 10-20 min. </li></ul><ul><ul><li>B stopped moving </li></ul></ul><ul><li>Find their average speeds. </li></ul><ul><ul><li>A = (2400m) ÷ (30min) A = 80 m/min </li></ul></ul><ul><ul><li>B = (1200m) ÷ (30min) B = 40 m/min </li></ul></ul>Distance-Time Graph A B
16. 16. D. Graphing Motion <ul><li>Line going down = slowing down </li></ul><ul><li>Line going up = speeding up </li></ul><ul><li>Flat (horizontal) line = moving at a constant speed </li></ul><ul><li>Speed of zero = not moving </li></ul>Speed-Time Graph
17. 17. D. Graphing Motion <ul><li>Specify the time period when the object was... </li></ul><ul><li>slowing down </li></ul><ul><ul><li>5 to 10 seconds </li></ul></ul><ul><li>speeding up </li></ul><ul><ul><li>0 to 3 seconds </li></ul></ul><ul><li>moving at a constant speed </li></ul><ul><ul><li>3 to 5 seconds </li></ul></ul><ul><li>not moving </li></ul><ul><ul><li>0 & 10 seconds </li></ul></ul>Speed-Time Graph