 Describe the concept of acceleration as a change in velocity  Explain why circular motion is continuous acceleration even when speed does not change  Calculate acceleration as the rate at which velocity changes  Graph acceleration on a velocity-time graph

 Is the rate at which velocity changes  It is calculated as the change in velocity divided by time  Acceleration = change in velocity a = Δ v time t time t  It is measured in meters/second 2 (m/s 2 )  An object accelerates when its speed, direction, or both change › Examples: pedaling a bike faster every second or the moon constantly accelerating around the Earth

 Is uniform circular motion  An object traveling in a circular motion is always changing its direction  As a result, velocity is always changing  Thus, acceleration is occurring

 Is acceleration that occurs in uniform circular motion  Examples: › Wind turbines

 If the acceleration is small, the velocity is increasing very gradually  If the acceleration has a greater value, the velocity is increasing more rapidly  Positive acceleration = velocity increasing  Negative acceleration = velocity decreasing

 A car accelerates from 0 m/s to 45 m/s northward in 15 s. What is the acceleration of the car?

 A cyclist travels at a constant velocity of 4.5 m/s westward, and then speeds up with a steady acceleration of 2.3 m/s 2. Calculate the cyclist’s speed after accelerating for 5.0 s.