At its "surface," Neptune has a gravitational acceleration only 14 percent stronger than is felt on Earth. Though Neptune is 17 times more massive than Earth, it has a diameter 3.8 times higher and is therefore considera... More » Science Physics Motion & Mechanics

The force of gravity on Earth is approximately 9.8 m/s2. The exact gravitational force, which is described as the acceleration of gravity, differs based on latitude and altitude of a specific point on Earth. For example,... More » Science Physics Motion & Mechanics

Gravity attracts objects that have mass and pulls them toward the center of the Earth. Everything on Earth is held by gravity including the atmosphere. More » Science Physics Motion & Mechanics
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Although they are quite dissimilar in almost every way, the Earth and Neptune do share some similar qualities such as gravity, color and orbit. With a gravitational pull that is only 14-percent stronger than the Earth's,... More » Science Astronomy Planets

The hottest Neptune ever gets at its surface, which is defined as the point at which its thick atmosphere is at the same pressure as the Earth's atmosphere at sea level, is -296 F. These temperatures are found at the pol... More » Science Astronomy Planets

Gravitational potential energy depends on the mass of the object, acceleration because of gravity and the height of the object from a zero position, which is typically the ground or surface where the object is resting. T... More » Science Physics Motion & Mechanics

The stopping, or braking, distance of a car is twice the original speed divided by the value of twice acceleration due to gravity, multiplied by the sum of the surface grade and the friction between the tires and the roa... More » Science Physics Motion & Mechanics