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Free Fall. Falling without air resistance Gravity is the only force acting upon the object causing the object to change it’s velocity Acceleration (change in velocity) due to gravity on earth is 9.8 m/sec/sec for all objects

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Free fall
Free Fall

  • Falling without air resistance

  • Gravity is the only force acting upon the object causing the object to change it’s velocity

  • Acceleration (change in velocity) due to gravity on earth is 9.8 m/sec/sec for all objects

  • That means . . . When an object is in free fall it will be increasing its velocity 9.8 m/sec every second

∑F=ma



a = 9.8 m/sec/sec

In Free Fall


Free fall neglecting friction which object the elephant or the feather will hit the ground first
Free Fall neglecting friction – which object – the elephant or the feather-will hit the ground first

  • The elephant and the feather each have the same force of gravity

  • The elephant has the greatest acceleration (change in velocity)

  • On earth, all objects (whether an elephant or a feather) have the same force of gravity

  • The elephant and the feather have the same acceleration (change in velocity) due to gravity

True or false:


Free fall cont
Free fall cont. elephant or the feather-will hit the ground first

  • In the absence of air resistance, the elephant and the feather land at the same time.

  • The force of gravity experienced by an object is dependent upon the mass of that object.

RULE: all objects (regardless of their mass)

experience the same acceleration

(change in velocity) when in a

state of free fall


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