Picture #1: • Acceleration: change in velocity compared with the time it takes to change - Average Acceleration: (Final Velocity - Starting Velocity) / Time • Velocity: expressed in meters per seconds (m/s) • Time: expressed in seconds (s) • Acceleration is measured in meters per second per second - meters per second squared (m/s²)
Picture #2: • Acceleration is a vector - magnitude - direction • Acceleration: increases and decreases in speed • Positive Acceleration: increase in speed - sliding down from a hill - small velocity -> large velocity • Negative Acceleration: decrease in speed - car slowing then - high velocity -> low velocity - initial velocity is larger than final velocity - (v2 - v1) will be negative - acceleration “a = (v2 - v1) / t” will be negative • Acceleration and velocity (rate of motion) in the same direction = speed will increase. • Acceleration and velocity in opposing directions = speed will decrease
Picture #3: • Acceleration: rate at which velocity changes • Velocity is a vector: has magnitude & direction - magnitude or direction changes = the velocity changes • Object accelerates speed = direction of motion or both magnitude and direction changes • Acceleration depends on amount of time for the change to take place and how much velocity changes - Small change in velocity can be a large change in acceleration if the change occurred quickly. - Large change in velocity can be a small change in acceleration if the change occurred slowly. - Increasing speed by 5 m/s in 5 seconds is smaller acceleration to increase speed by 5 m/s in 1 second.
Picture #4: • An object changing the direction of motion experiences acceleration even when not speeding up or slowing down • An object is always turning. • Centripetal Acceleration: acceleration in circular mode.
