Acceleration+by+Tara+and+Krystal

=Acceleration by: Tara and Krystal=

Acceleration is the positive change of speed over time. The opposite of accelertion is deceleration, the decrease in speed over time.

=Facts= > > **Formula:** Accelertion= Change in velocity/change in time > *velocity is the movement form one place to another over time and in a certain direction > > **Values:** Acceleration: cm/sec/sec (cenitmeters per seconds squared) > Velocity: m/s (meters per second) > Time: seconds > > **__Problems__**
 * People first started thinking about acceleration in the fourth century BC. Aristotle and Strato were the first to begin studying its properties
 * Gravity has a huge affect on acceleration. For example, if your riding a bike down a steep hill, the pull of gravity is strong and it pulls your bike faster causing you to go faster.
 * The acceleration of gravity on earth is 9.8 meters per second.
 * Free fall means dropping something straight down. When you drop something straight down, its acceleration increases by 9.8 meters every second due to the pull of gravity.
 * Deceleration is when something slows down or decreases in speed. On a graph, acceleration has a positive slope and deceleration has a negative slope
 * Q: How do you calculate acceleration?
 * A: **You divide the change in velocity by the change in time.**


 * Q: A body with an initial velocity of 8 m/s moves at a constant speed of 640 m in 40 seconds. Find its acceleration a
 * A= 0.4 m/s2


 * Links:**
 * The orange text book
 * []
 * google images []