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# The Moment Of Truth

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### The Moment Of Truth

1. 1. The Moment of Truth One & Two Dimensional Motion Physics Semester I 2008-2009 Mrs. Kuzara
2. 2. Motion in One Dimension <ul><li>What does constant velocity look like on a position vs. time graph? </li></ul><ul><li>What does constant velocity look like on a velocity vs. time graph? </li></ul><ul><li>What does increasing velocity look like on a position vs. time graph? </li></ul><ul><li>What does increasing velocity look like on a velocity vs. time graph? </li></ul>
3. 3. One Dimensional Motion <ul><li>What does constant velocity look like on an acceleration vs. time graph? </li></ul><ul><li>Describe the motion for each: </li></ul><ul><ul><li>velocity + acceleration + </li></ul></ul><ul><ul><li>velocity + acceleration – </li></ul></ul><ul><ul><li>velocity - acceleration + </li></ul></ul><ul><ul><li>velocity - acceleration - </li></ul></ul>
4. 4. One Dimensional Motion <ul><li>Draw the v vs. t graph for the following: </li></ul>
5. 5. One Dimensional Motion <ul><li>Draw the x vs. t graph for the following: </li></ul>
6. 6. One Dimensional Motion <ul><li>What is the difference between finding instantaneous velocity on an x vs. t graph, and on a v vs. t graph? </li></ul>
7. 7. Two Dimensional Motion <ul><li>What are the two parts to a vector measurement? </li></ul>
8. 8. Two Dimensional Motion <ul><li>List all of the scalar units of measurement that you can think of </li></ul><ul><ul><ul><li>time, speed, distance, mass, density, volume, work </li></ul></ul></ul><ul><li>List all of the vector units of measurement that you can think of </li></ul><ul><ul><ul><li>velocity, displacement, acceleration, force </li></ul></ul></ul>
9. 9. Two Dimensional Motion <ul><li>While following the directions on a treasure map, a pirate walks 45.0m north, then turns and walks 17.5m east. What single straight-line displacement could the pirate have taken to reach the treasure? </li></ul><ul><ul><ul><li>48.3m 21.3° E of N </li></ul></ul></ul>
10. 10. Two Dimensional Motion <ul><li>What is x net ? </li></ul><ul><ul><li>x 1 = 5km Right </li></ul></ul><ul><ul><li>x 2 = 20km Left </li></ul></ul><ul><ul><ul><li>15km left </li></ul></ul></ul><ul><li>What is vnet? </li></ul><ul><ul><li>v 1 = 10km/h South </li></ul></ul><ul><ul><li>v 2 = 15km/h West </li></ul></ul><ul><ul><ul><li>18km/h 34° S of W </li></ul></ul></ul>
11. 11. Two Dimensional Motion <ul><li>Break the following vector into its components: 600 m/s 30  N of W </li></ul><ul><ul><ul><li>300m/s N </li></ul></ul></ul><ul><ul><ul><li>520m/s W </li></ul></ul></ul>
12. 12. Two Dimensional Motion <ul><li>You head downstream on a river in a canoe. You can paddle at 5 km/h and the river is flowing at 2 km/h. </li></ul><ul><ul><li>How far downstream will you be in 30 minutes? </li></ul></ul><ul><ul><ul><li>3.5km downstream </li></ul></ul></ul><ul><ul><li>Now you paddle upstream at 5 km/h. How far upstream will you be in 30 minutes? </li></ul></ul><ul><ul><ul><li>1.5km upstream </li></ul></ul></ul>
13. 13. Two Dimensional Motion <ul><li>Dave rows a boat across a river at 4 m/s. The river flows at 6 m/s and is 360 m across. </li></ul><ul><ul><li>What is the resultant velocity of the boat? </li></ul></ul><ul><ul><ul><li>7.2m/s 56° downstream </li></ul></ul></ul><ul><ul><li>How long does it take Dave to cross the river? </li></ul></ul><ul><ul><ul><li>90s </li></ul></ul></ul><ul><ul><li>How far downstream is Dave’s landing point? </li></ul></ul><ul><ul><ul><li>540m downstream </li></ul></ul></ul><ul><ul><li>How long would it take to cross if there were no current? </li></ul></ul><ul><ul><ul><li>90s </li></ul></ul></ul>
14. 14. Two Dimensional Motion <ul><li>A jet flies due South at 300km/hr. A wind is blowing due West at 35km/hr. What is the jet’s resultant velocity? </li></ul><ul><ul><ul><li>302km/h 6.7° W of S </li></ul></ul></ul>
15. 15. Two Dimensional Motion <ul><li>A ball is thrown horizontally from a cliff which is 18 m high. It lands 22 m from the base of the cliff. </li></ul><ul><ul><li>How long was it in the air? </li></ul></ul><ul><ul><ul><li>1.9s </li></ul></ul></ul><ul><ul><li>With what speed was it thrown? </li></ul></ul><ul><ul><ul><li>12m/s </li></ul></ul></ul>