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## PowerPoint Slideshow about ' Acceleration' - wilmet

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### Acceleration

### I hope you enjoyed

By. DaaiI.

Acceleration and motion

- 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.

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.

Types of accelerating

- 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.

Calculating Acceleration

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

Positive and Negative Acceleration

- 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.

Graphing acceleration

- 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.

Thank you

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