Multiple Choice
According to Newton's Law of Gravity, which factor primarily determines the gravitational force between two objects?
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8. Centripetal Forces & Gravitation
Newton's Law of Gravity
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What causes Earth's seasons according to Newton's Law of Gravity?
A
The gravitational pull of the Moon on Earth
B
The tilt of Earth's axis relative to its orbit around the Sun
C
The rotation of Earth on its axis
D
The varying distance between Earth and the Sun during the year
Verified step by step guidance1
Begin by understanding that Earth's seasons are not caused by the gravitational pull of the Moon or the varying distance between Earth and the Sun. Instead, they are primarily due to the tilt of Earth's axis.
Earth's axis is tilted at an angle of approximately 23.5 degrees relative to its orbit around the Sun. This tilt is crucial in creating the seasons.
As Earth orbits the Sun, the tilt causes different parts of Earth to receive varying amounts of sunlight at different times of the year. This variation in sunlight is what leads to the changing seasons.
During summer in the Northern Hemisphere, the North Pole is tilted toward the Sun, resulting in longer days and more direct sunlight, which causes warmer temperatures.
Conversely, during winter in the Northern Hemisphere, the North Pole is tilted away from the Sun, leading to shorter days and less direct sunlight, which results in cooler temperatures.
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