Would gravity be stronger if the Earth was bigger and would a bigger planet normally have a stronger or weaker force of gravity?
With the same mass, gravity would be weaker, since it is inversely proportional to the distance between bodies
Yes, it can be possible, and I can give you a solid example that exists in real life, and that too, in our solar system. Uranus is about 4 times wider than the Earth, and is 14x the mass. Yet, Uranus has the same gravity as Venus, a meagre 8.87 m/s2. Uranus has about 10% lower gravity than Earth's.If Earth's diameter were doubled to about 16,000 miles, the planet's mass would increase eight times, and the force of gravity on the planet would be twice as strong. Anything with mass also has gravity. The more mass something has (Earth has a mass of 6.6 sextillion tons), the higher the force of gravity that it exerts on the objects around it. The force of gravity also increases or decreases with distance. The closer the objects are, the stronger the force of gravity will be. If we assume that the density of the Earth stays the same, then doubling the radius increases the planet's mass eight-fold. Surface gravity is now doubled, so most plants and trees promptly fall over. A black hole is a region of space, where gravity is so strong that nothing can escape from it, not even light. It has the strongest gravitational pull in the entire universe. Volume increases as a cube and surface area as a square, so even a slightly bigger planet would have much stronger gravity. The bigger the mass, the stronger the gravity this is direct and unavoidable and bigger the size for a given mass, the smaller the gravity, since you are farther from the center of mass. Therefore, the surface gravity of a planet or star with a given mass will be approximately inversely proportional to the square of its radius and the surface gravity of a planet or star with a given average density will be approximately proportional to its radius. Anything that has mass also has gravity. Objects with more mass have more gravity. Gravity also gets weaker with distance. So, the closer objects are to each other, the stronger their gravitational pull is. The acceleration of gravity at any given location near or above a planet's surface is often referred to as the gravitational field constant of that planet. Such acceleration values are directly proportional to the planet's mass and inversely proportional to the square of the distance from the planet's center. Mathematically, the force of gravity is said to be directly proportional to the masses of the objects and inversely proportional to the distance between the objects squared. Gravitational force is independent of object size and shape. If gravity were just a little stronger in our own three-dimensional world, the curvature of spacetime would be greater, and matter could more easily collapse in on itself. This arrangement would make stars, galaxies and planets extremely diminutive, compared with the ones in our reality.
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