An apple falling from a tree. . by 2tG08pX

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									An apple falling from a tree. . .
Does it accelerate while falling?

How do you know?

What causes the apple to accelerate as it
 fall?

What is gravity?
Free fall

What is free fall?

What does it mean when we say an object
 is free-falling?

What is the acceleration of an object free-
 falling?
Instantaneous Velocity (when free-falling)
           Time falling Velocity (m/s)
               (s)
                0
                1
                2
                3
                4
                5
               …
               50
A ball is tossed upwards with an initial velocity of 30 m/s. For each position, find
   the instantaneous velocity and acceleration of the ball for every second.
Distance traveled (when free-falling)

     Time falling (s)            Distance (m)

            0
            1
            2
            3
            4
            5
           …
           50
                Tennis Ball Free Falling
               Objects in free fall…
 Are always accelerating at a constant rate of
  ________________.
  When dropped, it accelerates at ________________ at
   ALL times.
   When tossed upwards, it accelerates by
   _____________ at ALL times, even at the top of its path
   when the instantaneous velocity is
   ____________.

 Increases or decreases its speed in
  increments of ________________ each second.

 Falls at ________________ distances every
  second of free-fall.
 Which object - the elephant
  or the feather - will hit the
  ground first?

   Why?
                       True or False
 The elephant has a smaller force of air resistance than
  the feather and therefore falls faster.
 The elephant has a greater acceleration of gravity than
  the feather and therefore falls faster.
 Both elephant and feather have the same acceleration of
  gravity, yet the feather experiences a greater air
  resistance.
 Each object experiences the same amount of air
  resistance, yet the elephant experiences the greatest
  acceleration of gravity.
 The elephant experiences less air resistance and than
  the feather and thus reaches a larger terminal velocity.
 The feather experiences more air resistance than the
  elephant and thus reaches a smaller terminal velocity.
Objects Falling in Vacuum




          featherdrop_sound.mov

								
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