1. Acceleration

2. Acceleration – rate at which velocity changes Results from a change in speed and direction Acceleration = change in velocity = Δv timet Acceleration = final speed – initial speed time Acceleration

3. A roller-coaster starts down a slope, its speed is 4 m/s. But 3 seconds later, at the bottom, its speed is 22 m/s. What is its acceleration? Initial speed = 4 m/s Final speed = 22 m/s Time = 3 s Acceleration = (22 m/s) – (4 m/s) 3 s Acceleration = 6 m/s 2

4. A roller-coaster’s velocity at the top of the hill is 10 m/s. Two seconds later it reaches the bottom of the hill with a velocity of 26 m/s. What is the acceleration of the coaster? Initial speed = 10 m/s Final speed = 26 m/s Time = 2 s Acceleration = (26 m/s) – (10 m/s) 2 s Acceleration = 8 m/s 2

5. A roller-coaster is moving 25 m/s at the bottom of a hill. Three seconds later it reaches the top of the hill moving at 10 m/s. What is its acceleration? Initial speed = 25 m/s Final speed = 10 m/s Time = 3 s Acceleration = (10 m/s) – (25 m/s) 3 s Acceleration = -5 m/s 2

6. A car’s velocity changes from 0 m/s to 30 m/s in 10 seconds. Calculate acceleration. Initial speed = 0 m/s Final speed = 30 m/s Time = 10 s Acceleration = (30 m/s) – (0 m/s) 10 s Acceleration = 3 m/s 2