Acceleration Due to Gravity

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Acceleration Due to Gravity
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What is Gravity
An attractive force between objects of mass
Galileo Galilei
Sir Issac Newton
Albert Einstein
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FREE FALL

• Objects in motion solely under the influence of
  gravity are said to be in FREE FALL. The objects
  can be either dropped or thrown.

Falling Apples, Bullets, Cannon Balls, Spitballs
and your little brother jumping out of the window
are all objects under free fall
Objects like Airplanes and Rockets are not.
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Acceleration Due to Gravity g

• g - A constant acceleration due to the
  attractive force of gravity between an object and
  the Earth

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g -9.80 m/s2 -32.2 ft/s2

• The acceleration at the earths surface is a
  constant 9.80 m/s2 toward the center of the
  Earth.

For our purposes we will neglect air resistance
and small variations due to elevation and
regional average mass density variations of the
Earth.
Negative sign indicates direction of the
acceleration. In physics down is negative and up
is positive.
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Acceleration Due to GravityEquations
All kinematic equations can be used by
substituting g for a in any equation

• d v1t 1/2gt2
• v22 v12 2gd
• v2 v1 gt

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