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Acceleration. Chapter 2.4. acceleration. Rate at which velocity is changing acceleration= change of velocity time Acceleration = change of speed (along a straight line) time.

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## Acceleration

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**Acceleration**Chapter 2.4**acceleration**• Rate at which velocity is changing acceleration= change of velocity time Acceleration = change of speed (along a straight line) time**Acceleration occurs when there is either a change in speed,**change in direction or both (whenever there is a change in velocity).**In physics, acceleration applies to both increases and**decreases in speed • Decrease in speed= negative acceleration**Practice Problem**• Suppose a car moving in a straight line steadily increases its speed each second, first from 35 to 40 km/h, then from 40 to 45 km/h, them from 45 to 50 km/h. What is its acceleration? • Speed increases 5 km/h each 1 s interval, therefore acceleration= 5 km/h*s (read 5 km per hour second)**Practice Problem 2**• In 5 seconds a car moving in a straight line increases its speed from 50 km/h to 65 km/h, while a truck goes from rest to 15 km/h in a straight line. Which undergoes the greater acceleration? What is the acceleration of each vehicle? • Acceleration for both vehicles is 15 km/h*s (the undergo the same acceleration even though their speeds are quite different)**Speed vs. Time Graphs**• X axis: always time • Y axis: always speed • Slope of line = speed/time • Slope tells you what happens to acceleration of the object • Area under line tells you the distance the object traveled.**What is happening in this graph?**• Objected started at rest • Speed is increasing • Object is accelerating**What is happening in this graph?**• Object is slowing down • Object is negatively accelerating (decelerating)**What is happening in this graph?**• Both objects are moving • Both objects are increasing speed but at different rates • Dashed line increases speed faster so it has the greater acceleration

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