Not always. The force of gravity is given by Newton's Law of Universal Gravitation:
F=(Gm1m2)/r2
So if a planet had twice the mass of the earth, and the same radius, gravity would be twice as strong.
However, if you had a huge planet that weighed the same as the earth (let's say it had a radius 3x greater), then gravity would be 9 times weaker at the surface.
The reason big planets like Jupiter have so much gravity is becuase they have A LOT more mass than the earth does.
It is more accurate to say that more massive planets have stronger gravity. If a planet had the same mass as Earth but a larger radius (i.e. it is less dense) surface gravity would be weaker, as the strength of gravity depends on both an objects mass and the distance from its center.
It would depend on the mass of the planets. The surface gravity of a planet is directly proportional to its mass and inversely proportional to the square of its radius. If two planets have the same mass but different sizes, the smaller planet will have stronger gravity because the surface is closer to the center of mass. Conversely, if two planets are of the same size, the one with more mass will have stronger gravity. Since larger planets usually have more mass than smaller ones they usually have stronger gravity, though not always.
Mass does not change with gravity. Weight increases on BIGGER planets and decreases on smaller planets.
It is more difficult for gases to escape from Jovian planets because they have much stronger gravitational forces due to their larger mass, which means gases are held more tightly to the planet. Terrestrial planets have lower mass and weaker gravity, making it easier for gases to escape into space.
The outer 4 planets have many more moons than the 4 inner ones. (Mercury, Venus, Mars, and Earth only have a total of three, whereas Jupiter and Saturn have more than 60 each.) The "outer planets" of our solar system (the 4 gas giants) are much larger than the "inner planets". They also have more space between their orbits, and therefore a larger number of small bodies (some of which were captured as moons). The gravitational effect of the Sun is lower, so satellites can orbit at greater distances without being destabilized.
They are larger and so they have more gravity.
They are larger and so they have more gravity.
Because since the outer planets are bigger then they have more gravity, drawing more objects toward it.
Generally speaking, the bigger or more massive a planet it, the more gravity it has, since gravity and mass are related. the small planets such as Mars and Mercury have a weaker gravity, while the larger planets have a strong gravitational field.
Because since the outer planets are bigger then they have more gravity, drawing more objects toward it.
They are larger and so they have more gravity.
It is more accurate to say that more massive planets have stronger gravity. If a planet had the same mass as Earth but a larger radius (i.e. it is less dense) surface gravity would be weaker, as the strength of gravity depends on both an objects mass and the distance from its center.
GRAVITY... gravity means that objects are "attracted" to other objects, and the larger the object, the more GRAVITY will "attract" the object. The sun's gravity is too large for the planets to overcome.
simple, the larger the planet, the greater the force of gravity.
Planets have different fields of gravity because their mass and size vary. The larger and more massive a planet is, the stronger its gravitational pull will be. The strength of gravity on a planet is determined by its mass and radius.
Neptune and Jupiter
The larger the mass of the planet, the greater the force of its gravity.