1. Chapter 11 MOTION

2. VIDEO http://www.youtube.com/watch?v=uDP7Pty8Qnw @ 34 seconds Drag Race

3. 11.1 DISTANCE AND DISPLACEMENT

4.  System of objects that are not moving with respect to each other  Frame of Reference needed to describe motion accurately and completely  Ex: Moving car and a tree on the side of the road  Relative Motion: movement in relation to frame of reference FRAME OF REFERENCE

5.  Distance: Length of path between 2 points  Displacement: direction and distance in a straight line from the starting point DISTANCE AND DISPLACEMENT

6.  Vector: quantity that has magnitude and direction  Add displacements using vector addition  When 2 vectors have same direction add them  When 2 vectors have opposite directions subtract them COMBINING DISPLACEMENTS

7.  Resultant Vector: sum of two or more vectors COMBINE DISPLACEMENTS

8. 1.What is a frame of reference, how is it used to measure motion? 2.How are distance and displacement different? 3.How are displacements combined? SECTION REVIEW QUESTIONS

9. Horse Head Nebula (interstellar clouds of dust), found in Orion, dark portions are thick dust, pinkish glow is from hydrogen gas

10. 11.2 SPEED AND VELOCITY

11.  The ratio of the distance and object moves to the amount of time an object moves  How far an object goes in a certain amount of time  S = D/T or V = D/T  Avg. Speed = calculated for the entire trip  Instantaneous speed = calculated at a point in time SPEED

12. MATH TRIANGLE S D T S =D/T D = S x T T = D/S

13.  Nissan GTR 11.2 Sec @ 121.8 miles/hour How long was the race? D=S * T121.8 miles/hour =.03 miles/second D =.03 miles/second * 11.2 seconds =.38 miles MATH PRACTICE

14.  Description of both speed and direction  Velocity is a vector  Why is velocity a vector?  Has both magnitude (size) and direction.  Changes in velocity can be: in speed, direction or in both VELOCITY

15.  Decide in the scenarios below if there is a change in velocity:  A car is going 45 mph and stops at a stop light.  A driver going down a straight portion of the highway is using cruise control to remain at a constant speed.  A child is riding a merry go round. VELOCITY PRACTICE

16. MATH TRIANGLE V D T V =D/T D = V x T T = D/V

17.  Two or more velocities may be added by vector addition  A boat is heading down river at 20 mph, the river is flowing at 3 miles per hour, what is the combined velocity?  23 mph COMBING VELOCITIES

18.  Distance time graphs show velocity DISTANCE-TIME GRAPHS

19. 0-60 in 3 seconds (acceleration) Reaching speeds in upper 60’s (velocity)

20. 11.3 ACCELERATION

21.  Acceleration is a vector  Changes in speed direction or both (change in object’s velocity)  Can be positive change in speed, increasing speed  Can be negative change in speed, decreasing speed  Example: Airplane taking off is positive acceleration, airplane landing is negative acceleration F-16

22.  Changes can be in direction  Merry go round is constant acceleration (constant speed always changing direction)  Changes can be in both direction and speed  Ex: Roller Coaster ACCELERATION

23.  Free Fall: movement of an object toward Earth due to gravity  Unit is: m/s 2  Objects on accelerate towards Earth at a rate of 9.8 m/s 2  Constant Acceleration: steady (constant) change in velocity  Instantaneous Acceleration: How fast a velocity is changing at a specific instant ACCELERATION http://www.youtube.com/watch?v=AvKJ9DcaJ8M&noredirect=1

24. CALCULATING ACCELERATION V f - V i A t

25.  Slope of a speed-time graph is acceleration GRAPHING ACCELERATION

26.  Acceleration is a curved line on a distance-time graph GRAPHING ACCELERATION

27. http://www.youtube.com/watch?v=q4Z7M4bPfHk Red Bull Jump