Lecture15

# Lecture15 - Chapter 13 Gravitation PHYS 2101,...

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Chapter 13 Gravitation 1 PHYS 2101, P.M.Shikhaliev LSU, Fall 2010

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13.2. Newton’s Law of Gravitation Gravitational force between two point masses is directly proportional to the masses and inversely proportional to the square of the distances between the masses. Constant proportionality is called gravitational constant. 2 PHYS 2101, P.M.Shikhaliev LSU, Fall 2010 m 1 m 2 F r , G =6.67 x10 11 Nm 2 /kg 2
13.2. The shell theorem If particle is outside of a spherical shell, gravitational force of the shell to the particle is same as gravitational force of a particle with same mass as shell, located at the center of the shell. 3 PHYS 2101, P.M.Shikhaliev LSU, Fall 2010 m 1 F = 0 r m 2 m 2 r m 1 Gravitational force of the shell to a particle is zero if particle is located inside shell.

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The net gravitational force from many particles equals to vector sum of forces from all particles. 4
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## Lecture15 - Chapter 13 Gravitation PHYS 2101,...

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