Acceleration Due to Gravity Gravity accelerates all objects in the same manner Any differences in freefall are due to air resistance Hammer and feather.

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Presentation transcript:

Acceleration Due to Gravity Gravity accelerates all objects in the same manner Any differences in freefall are due to air resistance Hammer and feather fall at the same rate on Moon… no atmospshere

Acceleration

Sir Isaac Newton

Newton’s Law of Gravitation

Newton’s Insight

Planetary Motion from Gravity

Kepler’s Laws Explained All three of Kepler’s law can be explained by Newton’s gravity Ellipses are special cases: bound orbits 2 nd law follows from central force and conservation of angular momentum Newton’s form of Kepler’s 3 rd law: p 2 = 4  2 a 3 G(M 1 +M 2 )