Acceleration+Velocity

1.Acceleration - The rate at which velocity changes over time; an object accelerates if it's speed,direction, or both change. 2.Ex.- A high speed dragster in the quarter -mile - A falling object (before terminal velocity is reached)

3.How to Find Change in Velocity: initial velocity - final velocity

4.How to Find Rate of Change in Velocity per Time Interval (intial velocity - final velocity)/time required for change

5.UNITS OF ACCELERATION: (m/s)/s

6.As acceleration increases or decreases the affects on the human body are shown in visible movement

7.Ex. of Positive and Negative Acceleration: An object moving in a positive direction with positve acceleration is speeding up An object moving in positve direction with a negative acceleration is slowing down An object moving in a negative direction with a negative acceleration is speeding up An object moving in a negative direction with a positive acceleration is slowing down

The change in velocity can depict the direction of acceleration by showing the direction of the object. If the change in velocity is negative, the direction of acceleration is negative. If the change in velocity is positive, the direction of acceleration is positive.

8.How to Find Acceleration on Velocity vs. Time Graph: On a velocity vs. time graph, the acceleration is represented as the slope of the graph 9.For an object with constant acceleration: It's average acceleration shows the average acceleration over a given time period, while acceleration shows the rate of change in velocity at a given time.

10.Acceleration and Time Relationship: For an object that is accelerating, as the velocity of the object increases, the amount of time it takes to pass through each consequtive equal time intrerval with shrink. So as acceleration increases, along with speed, the time will decrease. An example is a ball rolling down an incline. As the ball moves further and further down the incline its acceleration and velocity increase. In relation to this happening, the amount of time it takes the ball to pass through consequtive equal distances will decrease. So for example at the start, when the ball started rolling down the incline, it took it 1.110sec to get through the first .5m interval, but as the ball's acceleration an velocity increasesd by the time the ball reached the last .5m interval it took it only 0.12sec to pass through it. So there is an inverse relationship. As acceleration and velocity increase, the amount of time needed to get through a given time interval decreases. 1.In freefall the velocity is constantly changing. This means the velocity is constantly changing for each equal time interval. This can be shown on a position vs. time graph because the slope of a position vs. time graph is velocity. The slope of the graph would be parabolic (curved), because the slope is constantly changing, showing the slope is constanly changing. 2.If you were falling for one second, your final velocity after one second would be roughly 20 miles per hour. You fall at 9.8 m/s and you double meters per second to convert to miles per hour. So in miles per hour it would be roughly 20 miles per hour. 3.Mass does not not affect the rate at which velocities change for falling objects. For example a 5 pound weight and a 500 pound weight will have the same rate of change in velocity, and acceleration. 1.__**The rate at which velocity changes throughout the entire motion is constant, because the rate at which velocity changes is acceleration and the acceleration shown in the graph above is constant (horizontal line), so the rate at which velocity changes is constant. 2.The rate of change in velocity is shown on the graph above through the red slope. The red slope is the velocity vs. time line of the graph. The slope of velocity vs. time is acceleration (rate of change in velocity). So the slope of this line shows the rate of change in velocity. 3.The starting velocity is roughly 25 m/s, the starting velocity and the ending velocity are both the same except for the direction. 4.The speed at max height is zero because at max height the object has stopped traveling up and is now returning to earth because of gravity. So for a split second during the transition where the object stops traveling up and starts traveling down (max height) the object has zero velocity. This is due to the negative acceleration (gravitational forces) applied to the ball. These forces counteract the positive velocity of the upward motion and turn it into downward motion. 5.The velocity of the object right before it hits the ground is the same as the starting velocity of the object (roughly 25m/s)
 * __FREEFALL__**
 * __UP AND DOWN MOTION