2. Conceptual Physics by Hewitt C H A P T E R 2- Linear Motion http://www.youtube.com/watch?v=hz6 5AOjabtM

3. Speed : Math Problems

4. Approach to Solving Problems 1.Looking for 2.Know 3.Equation 4.Solve 5.Check

5. Equation—Rearrange generic equation so that unknown (what you are looking for) is all by itself on one side of equation Example: generic equation: s= d/t If looking for t: t x s = d/t x t t x s = d ts ÷ s= d ÷ s ts x 1/s = d/s t = d/s

6. UNITS!!!! When solving, substitute numbers AND units into equation so can check that have it set up right.

7. No. 4 problem L: t K: D= 4700 km s = 790 km/hr E: t = d/s S: t = 4700 km / 790 km/hr = 4700 km x hr/790 km = 5.95 hr C: 4700 km about distance across US and takes about 6 hours to get across US

8. 1.17 km/hr 2. 3. 4.55 s 5. 4 km 7. 4.5 m 9. 6 km/hr 11. 1200 m 13. a. 0.2 km/min b. 0.5 km/min c. 0.3 km/min 15. 40 min 17. 815 km/hr 19. 8.12 hr 21. 731 km/hr 23. 3.84 x 10 5 km Answers to odd no. problems of “Speed Problems” WS

9. For more help go to khanacademy.com http://www.khanacademy.org/science/physics/one-dimensional- motion/displacement-velocity-time/v/calculating-average-velocity-or-speed