1. Motion ISCI 2002

2. Speed Speed: change in distance over time Speed =  d /  t Constant vs. Average Speed Speed is a ‘scalar’ quantity – No directional properties

3. Velocity Velocity: includes the speed of an object plus direction. Velocity =  d /  t + direction! Displacement – Object moves from one location to another – Distance and direction from a starting point

4. Displacement

5. Velocity and Displacement are Vectors Vectors: have both magnitude and a direction – Velocity, acceleration, displacement, etc. Vectors are represented by arrows

6. Vector Summation Parallel vectors may be summed When vectors are at right angles – (a) Parallelogram Rules – (b) use trigonometry rules to solve Pythagorean Theorem

7. Vector Addition

8. Paralleogram Law The so-called parallelogram law gives the rule for vector addition of two or more vectors. For two vectors and, the vector sum is obtained by placing them head to tail and drawing the vector from the free tail to the free head.parallelogram lawvector sum

9. Vector Resultant

10. Acceleration Acceleration: is a change in the velocity of an object. Acceleration =  v /  t When you change directions, slow down, speed up, turn you are undergoing acceleration. Acceleration may be (+) or (-)

11. Instantaneous Speed and Velocity Speed or velocity at any given moment in time – Speedometer in your car

12. Motion and Graphs Graphs – Straight-line or linear slope indicates a direct or proportional relationship between the variables Speed or velocity at that specific time – Non - proportional Slope of the line tangent to the curve of the line Positive or Negative relationship between variables

13. Graphical Slopes Slope: rise/run Change in position (y) over time (x)

14. Calculating the Slope of a Graph

15. Distance-Time Graphs Constant velocity (+10 m/s); No acceleration Changing, positive velocity – acceleration (change in velocity)

16. Constant Velocity – No Acceleration

17. Velocity – Time Graphs Zero Acceleration

18. Constant Velocity – Zero Acceleration

19. Velocity-Time Graphs (Acceleration)