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Gravity

One of the four fundamental interactions, gravity is responsible for the fact that any objects with mass attract one another. According to general relativity, it is a space time curvature, but according to quantum mechanics it is the result of exchanges of virtual gravitons.

4,784 Questions

What is the acceleration due to gravity near the earth's surface?

9.81 m/s2

gravity is dependant on the total mass of the two bodies, and the distance between their mass centers, and irrespective of any motion or rotation on earth, their would be a very small acceleration due to rotation about the earths axis (0 at the poles , maximum at the equator) , but this is a totally seperate issue

Is there a link to planet size and its gravity?

Yes. To be clear, we have to consider size and mass separately. The gravity of an object increases with greater mass, but decreases with greater distance from the center

If two planets have the same mass, but different sizes (meaning they have different densities) then the larger planet will have weaker gravity because the surface is farther from the center.

Traditionally, the equation for finding the acceleration due to gravity is:

g=G*m/(r^2)

where G is a constant calculated to get the correct units, m is the mass in kilograms, and r^2 is the square of the distance from the center of mass as measured in meters. For finding the surface gravity of a planet, us the planet's radius for r.

However, you can use a shortcut of this equation by tweaking the units:

g=M/(R^2) where M is mass in Earth masses and R is the radius in Earth radii. By plugging in the mass and radius of a planet relative to that of Earth, you get gravity relative to Earth's surface gravity.

For example, Jupiter is 318 times the mass of Earth and has about 11.2 times the radius. If we plug that into our equation g=318/(11.2^2)= 318/125.44 = 2.53. So Jupiter's "surface" gravity is about 2.5 times that of Earth.

How far above the table's surface is the center of gravity of the combined object?

To take a riff on the common comedy bit: How long is a piece of string?

It depends on the composition and mass distribution of your table and your object.

If a mineral is 10 times heavier than water what is its specific gravity?

The specific gravity of a mineral that is 10 times heavier than water would be 10. Specific gravity is a unitless measure that compares the density of a mineral to the density of water, which is 1 g/cm3.

Does gravity affect hurricanes?

Gravity does not directly affect hurricanes. Hurricanes are driven by a combination of atmospheric conditions such as temperature, humidity, and wind patterns. However, gravity does play a role in maintaining the structure of Earth's atmosphere, which can influence the behavior of hurricanes indirectly.

Are we still researching gravity today?

Yes, gravity is still not fully understood. One theory still being researched is the existence of a particle called the graviton which could be the cause of gravitational attraction between bodies.

The sole hold-out in the Grand Unification Theory is Gravity. Einstein tried to solve it and failed.

What is an object's change in position over time called?

An object's change in position over time is called displacement. Displacement is a vector quantity that represents the distance and direction of an object's final position relative to its initial position.

Is a larger or smaller thing easier to balance?

In general, smaller things are usually easier to balance compared to larger things. Larger things have more weight and surface area, making them more challenging to balance due to factors like gravity and instability. Smaller objects have less weight and are easier to control and stabilize, making them simpler to balance.

What happen to gravitational pull of Earth if mass of the object increase or decrease?

The FORCE, or Gravitational Pull of the Earth on an Object is DIRECTLY PROPORTIONAL to the Object's Mass.

Force = Mass x Acceleration of Gravity

So, if Mass goes up, Pull goes up, If the Mass goes down, the Pull goes down.

Why does the front wind screen of a moving car get wet when rain is falling vertically downward?

-- A raindrop takes some time to fall through a distance equal to the

height of the windscreen.

-- In that length of time, the car moves some distance forward.

-- Any raindrop that is directly in front of the windscreen, but nearer

to it than the distance the car will move before the raindrop falls past

the bottom of the windscreen, will splat against the windscreen as its

fall is interrupted.

What is the mass of a child if the force of gravity on the child's body is 100 N?

If the child weighs 100 N on Earth, then his mass is about 10.2 kilograms.

How do you know black hole is singularity and why is believed that things fall through it. Maybe it is only a ball with enormous mass or gravity that even light can not escape?

We know that there is a singularity at the heart of a black hole based on observation and calculation, but it is also known that things don't fall throught it. Instead, objects fall into it and can't escape, due to the large amount of gravity produced by the singularity.

What is the specific gravity of a strawberry?

A strawberry is almost all water and therefore the specific gravity or density will be close to that of water. In fact, it is around 0.95 that of water so a strawberry will just float although it will be almost totally submerged.

What is the change when an object is pushed along an inclined plane to a height?

When an object is pushed along an inclined plane to a height, its potential energy increases due to the change in height. This is because work is done against gravity to lift the object to a higher position. The object's kinetic energy may also change depending on how it was pushed and any friction present on the inclined plane.

Where does an object center of gravity always lie?

It is always different depending on the object. For example a female humans' center of gravity is in the hip. as a male humans' center of gravity is in the chest. But once you have found the center of gravity in an object the center of gravity should be the same in every object like it.

How would the moon travel if it wasn't for the pull of earth's gravity?

Actually very much the way it does now ... in an orbit around the sun, but

without any wrinkles or perturbations caused by being near the Earth.

How does gravity affect hydrogen?

Gravity affects hydrogen the same way it does any other element. Hydrogen is lighter than air (nitrogen and oxygen) and therefor is buoyant in air, meaning it floats. No more differently than a piece of wood floats on water. There is no force counteracting gravity's force on the hydrogen, except that nitrogen and oxygen are pulled down to earth displacing the hydrogen. when the hydrogen reaches the outer layer of the atmosphere it will be held there by gravity until some other force (solar wind maybe) strips it away from the earth.

What is earths gravity in gravitational potential energy?

The Earth's gravitational field and gravitational potential energy are really two quite different things. The relationalship is the following:

Gravitational potential energy = mass x gravity x height

Where gravity is the acceleration due to gravity - near Earth's surface, that's 9.8 meters/second2 - or the equivalent, weight per unit mass (which near Earth's surface is 9.8 newton/kilogram).

How does gravity affect the other planets in the solar system?

"Gravity" is responsible for the existence of planetary orbits, and for their shapes

and periods. It's also the reason for the spherical shapes of the planets, and for

the existence of atmospheres, in the case of those planets that have any.

Which planet has gravitational force that is equal to 37.7?

I think it is Mars, but the question is incomplete.

Mars does have a surface gravity that's 37.7 percent of the Earth's.

What is the value of acceleration due to gravity at pole of the earth?

Answer #1:

9.8 m/s2

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Answer #2:

The apparent variation in gravity at different places on Earth is the result of a

combination of two causes. One of them is real ... Earth's greater radius to the

poles than to the equator. The other one ... the so-called 'centrifugal force' due

to the Earth's rotation ... doesn't change gravity, but appears to create a force

that acts in a direction different from gravity and thus partially counteracts it.

I won't go into a lot of detail on the subject of centrifugal force here, except

to just mention that no such force exists and I really hate it when people talk

about it as if it does.

I tried to find a source on the internet that differentiates between these two

causes, so that I could give you the real, actual difference in gravity between

the equator and the poles. But my exhaustive 5-minute search produced only

a source that lists the total apparent gravity as a function of latitude, which

includes both effects. So I guess I can strictly answer your question, because

the apparent gravity at the poles is not affected by any so-called 'centrifugal'

component, but the figure I have for apparent gravity at the equator does

include the full effect of that hideously popular nonexistent force.

The value of acceleration due to gravity at Earth's poles is 9.832 m/s2 .

The apparent value of acceleration due to gravity at Earth's equator is 9.780 m/s2 .

The difference is about 1/2 of 1 percent ... the difference between 199 pounds and 200 pounds

when the same mass is weighed in both locations.

Is the fulcrum point on a forklift a vertical line through the middle of the center of gravity?

No, the fulcrum point on a forklift is typically the front wheels, while the center of gravity is higher up near the load. This arrangement allows the forklift to balance and lift loads efficiently.

Which falls faster 1 lb of lead or 1 lb of feathers?

Since lead is heavier, one would think it would fall faster. But, in fact, both will fall at the same speed. Earth's gravitational force directly depends on the mass (F=mg). Since their mass is equal (1 lb), both would be pulled by the equal quantity of force and hence fall at the same speed.