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Download Lesson 20 - Acceleration
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Acceleration Science 10 Constant Velocity Problems 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 54km/h 612km/h 5.3km/h 420km 3.64h 7.5h 3000km 12km 8.20m/s 6.5km/h 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 36000km 45s 9.49m/s 465km 1.49x108km .0909h 12m 330m/s 3.3x10-7s .450s Acceleration When an object’s velocity changes, we refer to that as acceleration Speed/velocity is the rate of change of position and is typically measured in m/s Acceleration is the rate of change of velocity/speed and is typically measured in m/s2 A Dropped Object Plot the following points on a position time graph Connect the points with a smooth curve (not a series of straight lines) How can you measure the speed of the object at any point? time (s) 0 0.1 0.2 0.3 0.4 0.5 0.6 height (m) 2 1.95 1.80 1.55 1.21 0.77 0.23 Tangent Line A tangent line is a straight line that touches a curve at only one point If you draw a tangent line and calculate the slope, you have the instantaneous velocity/speed of the object Instantaneous Velocity Using your position time graph, draw a tangent line at 0s, .25s and .5s Calculate the slope of each of these tangent lines Draw a new graph with velocity on the y-axis (m/s) and time (s) on the x-axis Plot your three points on the velocity time graph; what do you notice? Acceleration A straight line on a velocity time graph indicates constant acceleration and the slope of the line is the measure of the acceleration Does the slope of the line on your velocity time graph appear similar to any numbers we have seen in the past? Acceleration due to Gravity In the lab we measured the acceleration due to gravity and compared it to the accepted value (9.81m/s2) The data you plotted here is also for an object dropped (from a height of 2.00m) so the slope of the line on the velocity time graph should compare favourably to this number