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# Acceleration - PowerPoint PPT Presentation

Acceleration. By. Daai I. Acceleration and motion. Acceleration is the change in velocity divided by the time it takes for the change to occur.

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## PowerPoint Slideshow about 'Acceleration' - wilmet

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Presentation Transcript

### Acceleration

By. DaaiI.

• Acceleration is the change in velocity divided by the time it takes for the change to occur.

• When you watch a plane moving for the first few seconds it seems to barley move, however with each passing second you can see it moving faster and faster , this is an example of acceleration.

• Like velocity, acceleration has a direction. If an object speeds up, the acceleration is in the direction that the object is moving.

• If an object slows down, the acceleration is opposite to the direction that the object is moving.

• There are three types of acceleration ,speeding up, slowing down, and changing direction .

• Speeding up is like when you get on a bike and begin to pedal. The bike moves slowly at first, and then accelerates because its speed increases.

• Slowing down is like when you are riding a bike at a quick speed, and you apply the brakes. This causes you to slow down.

• Changing direction in acceleration is that the motion ,is not always along a straight line.

• If an object is moving in a straight line, its acceleration can be calculated using this equation.

• Positive acceleration is when the object is speeding up, but negative acceleration ,is when the object is slowing down.

• When you speed up, your final speed always will be greater than your initial speed. So subtracting your initial speed from your final speed gives a positive number.

• Because your final speed is less than your initial speed, your acceleration is negative when you slow down.

• A speed-time graph can be used to find acceleration. When the line rises, the object is speeding up.

• When the line falls, the object is slowing down.

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