 Acceleration: is the change in velocity divided by the time it takes for the change to occur. (A V T)  Like velocity, acceleration has a direction.

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Presentation transcript:

 Acceleration: is the change in velocity divided by the time it takes for the change to occur. (A V T)  Like velocity, acceleration has a direction.  If an object speeds up the acceleration is in the direction the object is moving. If the object slows down acceleration is in the opposite way the object is moving.  If the direction of acceleration is at an angle to the direction of motion then the direction of motion will turn toward the direction of acceleration.

 When an object that is already in motion speeds up it is accelerating.  When an objects speed increases it is accelerating.  When a car stops accelerating, it will move in a straight line at the speed it had when the acceleration stopped.

 When your speed is changing you are still accelerating.  When a car is slowing down its speed decreases that is still acceleration.  Acceleration occurs when an object speeds up and when it slows down.  Any time an object slows down, its acceleration is in the opposite direction of its motion.

 Motion is not always along a straight line.  If the acceleration is at an angle to the direction of motion, the object will turn.  At the same time, it might speed up, slow down, or not change speed at all.  If someone throws a ball upward the ball starts going up, but its direction of motion changes as its path turns downward. Here the acceleration is downward. The longer the ball accelerates the more its path turns toward the direction of acceleration.

 If an object is moving in straight line, its acceleration can be calculated using this equation:  Acceleration Equation (in m/s2)= ( final speed (in m/s)- initial speed (in m/s)) time (in s) a =(sf-si) T  In this equation time is the length of time over witch the motion changes. In SI units, acceleration has units meters per second squared (m/s2).

 An object is accelerating when it speeds up, and when it slows down.  When you speed up your bike your final speed always will be greater than your initial speed. So subtracting your initial speed from your final speed gives you a positive number.  Suppose you slow down now if you subtract the final speed from the initial speed the acceleration is going to be a negative.