Answer:
When it's closest to the sun.
Explanation:
The force of gravity acting on a planet is equal to its mass times its centripetal acceleration.
Fg = m v^2 / r
The force of gravity is defined by Newton's law of universal gravitation as:
Fg = mMG / r^2
Therefore:
mMG / r^2 = m v^2 / r
MG / r = v^2
v increases as r decreases. So the planet is moving fastest when it's closest to the sun, also known as the perihelion.
The force of gravity acting on a planet is equal to its mass times its centripetal acceleration.
Fg = m v² / r
The force of gravity is defined by Newton's law of universal gravitation as:
Fg = mMG / r²
Therefore:
mMG / r² = m v² / r
MG / r = v²
v increases as r decreases. So the planet is moving fastest when it's closest to the sun, also known as the perihelion.
perihelion
The fastest a planet moves is at perihelion (closest) and the slowest is at aphelion (farthest). Law 3. The square of the total time period (T) of the orbit is proportional to the cube of the average distance of the planet to the Sun (R)
The Earth is closest to the Sun, at its perihelion, about two weeks after the December solstice and farthest from the Sun, or at its aphelion, about two weeks after the June solstice. Earth is farthest from the Sun when it is summer in the Northern Hemisphere.
To learn more about perihelion, refer
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