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on 15 September 2014

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Transcript of ACCELERATION

Graphing Acceleration
Graphs can be used to analyze the motion of an object that is accelerating.
By: Meriam D. & Ayesha
Calculating Acceleration
Acceleration in Science
Acceleration is the rate at which velocity changes.
Velocity has 2 components-speed and direction.
In science, acceleration refers to increasing speed, decreasing speed, or changing direction.
An example of acceleration is when a car stops at a red light and they light changes to green. The driver steps on the accelerator, and as a result, the car speeds up, or accelerates.
1- What is acceleration?
2- What 3 kinds of change in motion are called acceleration?
Increasing Speed :

Decreasing speed:

Changing Direction:
Any time an object increases in speed, it experiences acceleration.
An example of acceleration is when a softball accelerates when the pitcher throws it and again when the bat hits it.
Just as objects can speed up, they can also slow down.
Motion in which speed decreases is also considered as acceleration in science.
This change in speed is also called deceleration, or negative acceleration.
An example of deceleration is, when a car comes to a stop at a red light.
An object can be accelerating even if it is at a constant speed, by changing direction.
For example, a car will be accelerating if it follows a gentle curve in the road or changes lanes.
To determine the acceleration of an object, you must calculate the change in velocity during each unit of time.
Acceleration= Final velocity- Initial velocity
If there is a straight line, it means that acceleration is constant.
If, for every second, there is an increase of speed, there will be a slanted line. A slanted line means there is a linear relationship.

The graph of distance versus time is a curved line, and shows a nonlinear relationship. This tells you that the distance traveled by the accelerating object varies each second. As the speed increases, the graph curves upward.
If velocity is measured in meters/ second and time is measured in seconds, the unit of acceleration is meters per second per second. The unit is written as m/s .
Acceleration is the change in velocity per unit if time and velocity is the change in distance per unit of time. Therefore, acceleration has 2 units of time.
1- What is acceleration?
2- What are the 3 kinds of acceleration?
3- What is the formula for acceleration?
4- What does it mean if there is a linear relationship?

Full transcript