MOTION

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MOTION
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Constant Speed

• When an objects speed does not change.
• An object is always traveling at its average
  speed.
• Example Your car on cruise control.
• Equations Vave total distance/total time

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Constant Speed Graphs

• Distance vs. Time

• Speed vs. Time

Distance
Speed
Slope of d v. t graph velocity
time
time
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Acceleration

• Any change in speed.
• Acceleration
• Deceleration -
• a Vf Vt / time
• V vi at
• D ½ at2

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Acceleration Graphs

• Distance vs. Time

• Speed vs. Time

distance
speed
Slope of v v. t acceleration
time
time
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FREEFALL

• Freefall is when an object is released and is
  affected by gravity only.
• It is a special case of acceleration.
• All objects fall at the same rate on earth,
  ignoring air resistance.
• That rate is 10 m/s2 or 32 ft/s2 or 22 mph/s.

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Air Resistance

• Air resistance is the friction of air particles
  against moving objects.
• The faster an object travels the (more or less)
  air resistance it feels.

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Air Resistance

• Objects that are very affected by air resistance
  have a low density and have a large surface area.
• Objects that are not very affected by air
  resistance have a high density and an aerodynamic
  shape.

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Terminal Velocity

• If air resistance is taken into consideration ,
  the object will reach terminal velocity.
• Terminal velocity is the highest speed an object
  can reach due to air resistance.
• Example If a baseball is dropped off a tall
  building, it will accelerate until it reaches 60
  mph. It will continue at this speed until it
  hits something but will never go faster.
• How can a baseball be pitched at 100 mph?

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FREEFALL

• Since freefall is just a special case of
  acceleration, all the equations remain the same.
• v at
• d ½ at2
• a g 10 m/s2

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