Acceleration is the rate at

1
ACCELERATION

• Acceleration is the rate at
• which velocity changes.

2

• Acceleration is created by forces

• The pull of gravity accelerates objects 9.8 m/sec
  for every second they fall.
• 9.8 m/sec/sec or 9.8 m/sec2
• All objects fall at this rate, regardless of
  mass!

They fall at the same speed!!!
3
When you accelerate, you feel forces!

• When the car goes faster, you are pressed back in
  your seat
• Turning pushed to the side
• Acceleration is measured in Gravities (G)
• 1 G is equal to the pull of the Earths gravity
  (9.8 m/sec2)
• When a fighter jet turns, it can pull 9-10 G of
  acceleration

4
Any change in velocity creates acceleration

• Positive acceleration - velocity increases.
• Negative acceleration (deceleration) - velocity
  decreases.
• Remember that velocity has direction, so
  acceleration occurs whenever direction changes

5
CIRCULAR MOTION

• Centripetal acceleration is the acceleration that
  occurs in circular motion
• An object traveling in a curve is always changing
  direction, therefore, acceleration is occurring.
• Like the merry-go-round at the park!

6
EXAMPLES OF ACCELERATION

• Roller Coaster
• Positive going down the hill
• Negative - slowing down
• Centripetal curves, loops, etc.
• Race Car?
• Rocket?

7
GRAPHING ACCELERATION
250





Negative Acceleration
200
150
Velocity (m/s)
100
50
Constant Acceleration
Positive Acceleration
1
2
3
4
5
0
Time (s)