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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 does gravity mean in bridge?

Gravity in a bridge refers to the downward force that the structure must withstand from its own weight and the weight of vehicles, people, and other loads passing over it. Gravity is one of the key factors engineers consider when designing bridges to ensure their stability and safety.

Why is gravity a balance force?

There's most likely no such thing as a "balance force". And if

you're thinking of "a set of balanced forces whose vector sum

is zero", then gravity is most certainly NOT one of those.

Why do different planets have different escape speeds?

The relationship between escape velocity and atmosphere is not a direct one. Escape velocity depends upon the local gravity, which is consequential to the planet's mass and distance. The existence of an atmosphere also can depend upon mass, since with too little mass a planet doesn't hold on well to its atmosphere.

How do gravity and friction affects the motion of an object?

The mass of The Earth is determined by the size. and we have less gravity. which controls movement in the object, and in Newton's laws it explains that every Action has a reaction so what you do to an object will have an effect on it.

What does gravity always do?

It always attracts two masses toward each other

along the line between their centers.

Is gravity acting on a moving bicycle?

Yes, gravity acts on a moving bicycle. Gravity pulls the bicycle and the rider toward the center of the Earth, influencing their motion. This force helps to keep the bicycle in contact with the ground and affects its acceleration and speed.

What is the relationship mass and the force of gravity?

Mass is a measure of how much matter something has. Weight is the effect of gravity pulling on that mass. So an object that weighs 1kg on Earth would weigh less on the Moon which has less gravity even though the mass of the object is constant.

The relationship is:

Force of gravity on an object in a certain place = (object's mass) x (acceleration of gravity in that place) .

What does the strength of buoyant force depends on?

The strength of the buoyant force depends on the density of the fluid the object is submerged in, as well as the volume of the displaced fluid. The buoyant force is proportional to both the density of the fluid and the volume of the displaced fluid.

How heavy something is based on gravity?

Yes. Weight is the result of gravitational attraction. The general relation is:

weight = mass x gravity

Near the Earth's surface, the weight (in newton) is approximately 9.8 times the mass (in kilogram), since the surface gravity of Earth has that value.

What is the gravity of the sun compared to the earth?

Even though the sun is about 1.3 million times the size of earth, the mass is only about 28 times greater. This is largely because the sun is comprised of gas (hydrogen and helium mostly). The sun actually has a gravitational force of about 28 times that of earth.

Why don't we notice the effect of gravity between ourslves?

For it is too weak. The earth is more than a few million times the mass of us, and yet the acceleration is still only like 9.8m/s2. So we would never be able to feel the gravitational pull between people.

Who discovered gravity and what is the law of gravity?

Isaac Newton is credited with discovering gravity. The law of gravity, also known as Newton's law of universal gravitation, states that every mass attracts every other mass with a force proportional to the product of their masses and inversely proportional to the square of the distance between them.

If an object weighs 200 N at the Earth's surface and R is the radius of the Earth at what distance in terms of R from the centre of the Earth would the weight of the object be fifty Newtons?

Gravitational force decreases as the square of distance. In this case, the force

has decreased by 200 N / 50 N = 4. Therefore, the distance must be sqrt (4) = 2

times what it was. It was R before, then it must be 2R now.

How does the gravity transform energy?

When an object is moved up, against the force of gravity, its potential energy increases. Since it requires some force to move it up, some other form of energy is converted into potential energy. When the object moves down (for example, when it falls down), this potential energy is again converted into some other type of energy. For more information, do some reading on the topic of "potential energy".

What is the specific gravity of 50.0ml of urine?

The specific gravity of urine varies from one individual to another. And whatever

it happens to be, it doesn't depend on the volume of the sample.

Where is the value of gravity greater than 9.8?

The value of gravity can be greater than 9.8 m/s^2 on celestial bodies with larger masses than Earth, such as Jupiter or the Sun. Additionally, gravity can vary slightly depending on the altitude and location on Earth due to factors like topography and density variances in the Earth's crust.

Will the value of gravity change greatly in different parts of the city why?

The value of gravity does not change greatly within a city. Gravity is a constant force that is generally consistent across different areas unless influenced by significant geological factors. Variations in elevation or density of materials within a city may cause slight differences, but these are typically not noticeable in everyday situations.

What is it called when a satellite's inertia carries it forward while gravity pulls it downward?

This is known as orbital motion, where a satellite's forward velocity allows it to maintain its orbit while being continuously pulled towards the center of the Earth by gravity. This delicate balance between inertia and gravity keeps the satellite in a stable path around the planet.

How are acceleration and gravity related?

Acceleration due to gravity is the rate at which an object speeds up while falling towards the Earth. This acceleration is approximately 9.81 m/s^2 near the Earth's surface. Gravity causes objects to accelerate towards the center of the Earth, leading to phenomena like free fall and weightlessness.

Is the a way to replicate gravity?

Acceleration has exactly the same effect as gravity. A way to get continuous acceleration in outer space without continuously spending energy is through rotation - for example, a large rotating "wheel", as shown in the movie "2001 - a Space Odissey", among others.

Is it true that the weight of a substance is defined as its mass divided by its volume?

No, weight is a measure of the force of gravity acting on an object's mass. The weight of an object can change with location due to differences in gravitational pull. Mass, on the other hand, is a measure of the amount of matter in an object and is constant regardless of location.

Is it true mercury doesnt have enough gravity to have an atmosphere?

Mercury does not have what we would call an atmosphere. It is very, very thin , a collection of a few atoms per cubic meter, some being ionized from the surface. It is less than a trillionth of Earth's.

What is electromagnetic gravity?

Electromagnetic gravity is a theoretical concept that attempts to unify the forces of electromagnetism and gravity into a single theoretical framework. It posits that gravity could emerge from the interactions of electromagnetic fields in a particular way, although this idea has not been conclusively proven or widely accepted in the scientific community.

What is earth gravitationally attracted to?

Earth is gravitationally attracted to the Sun, which is the primary force keeping Earth in orbit around it. The gravitational pull between the Earth and the Sun is what keeps the Earth in its elliptical path around the Sun.

How uniform circular motion is rewarded from accelerated motion?

The purpose and function of the word "rewarded" here are very unclear,

as is the thrust of the question.

Uniform circular motion IS uniformly accelerated motion, since the direction

of the motion is constantly changing.