Acceleration. Acceleration – The rate at which velocity changes Results from a change in speed and direction Acceleration = change in velocity = Δv timet.

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Acceleration

Acceleration – The 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

The most famous acceleration is known as GRAVITY! The most famous acceleration is known as GRAVITY! On Earth, the value of the acceleration due to gravity (g) is 9.8 [m/s 2 ]. On Earth, the value of the acceleration due to gravity (g) is 9.8 [m/s 2 ]. On the Moon, the value of the acceleration due to gravity is g = 1.6 [m/s 2 ]. On the Moon, the value of the acceleration due to gravity is g = 1.6 [m/s 2 ].

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

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

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

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