By: Sahar M. 8 Grade Girls.  Motion is the action or process of moving or changing place or position.  Acceleration is the change in velocity divided.

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Presentation transcript:

By: Sahar M. 8 Grade Girls

 Motion is the action or process of moving or changing place or position.  Acceleration is the change in velocity divided by the time it takes for the change to occur.  Acceleration has direction. The acceleration is in the direction that the object is moving.  Acceleration occurs whenever an object speeds up, slows down, or changes direction.

 When you think of acceleration, you probably think of something speeding up. However, an object that is slowing down also is accelerating.  If the acceleration is in the same direction as the velocity, the speed increases and the acceleration is positive.  If the speed decreases, the acceleration is in the opposite direction from the velocity, and the acceleration is negative.

 A change in velocity can be either a change in how fast something is moving or a change in the direction of movement.  Any time a moving object changes direction, its velocity changes and it is accelerating.

 Acceleration is measured in m/sec/sec or m/sec 2  Acceleration= final velocity- starting velocity time  Change in velocity = final – starting velocity  Acceleration= change in velocity time

 When a car moves faster and faster its speed is increasing.  When a car moves slower its speed is decreasing,  When a car changes direction its velocity changes too.

Positive acceleration Negative acceleration

 A car traveling at 60 mph slams on the breaks to avoid hitting a deer. The car comes to a safe stop 6 seconds after applying the breaks. What is the car’s acceleration?

 Acceleration Velocity (final) Velocity (original ) time = = 0 mph - 60 mph 6 seconds - 60 mph 6 seconds = = - 10 miles per hour per second