What is gravity I m still a sophomore in junior high school

Gravity is a force that is close to the center of the earth because of the gravitational pull of the objects around the earth, whether you are standing on the top of a mountain or at the bottom of a mountain, you are gravitational close to the center of the earth, the top of the mountain is farther away from the center of the earth, the mountain is farther away from the center of the earth, the mountain is closer to the center of the earth, the ground is preventing you from moving closer to the center of the earth, because of gravity, you don't float away from the ground.

Whether it's the top of a mountain or the ground, there's a force that supports you, and you're both subject to gravity, which is gravity, then the two forces are equal, and we say that the two forces are balanced, and the two forces acting on the same straight line are opposite and equal are called equilibrium forces.

Gravity = mass of the object * N kg (or 10 Nkg).

A balanced force is a force that is equal in two directions.

Several forces acting on the same object, if the object is still or becomes in a state of stationary or uniform linear motion, then the net force of these forces is zero, and we say that these forces are balanced.

Judge balance.

1. Two forces act on the same object. (homogeneous).

2. Each pair of forces or each pair of resultant forces is in the same straight line, opposite in direction, and equal in magnitude. (i.e. the net force is zero) (equal size, same line, opposite direction).

3. The object is at rest or in a state of uniform linear motion. (as distinguished from the interaction force).

Classification of Equipoise.

Equilibrium forces are also divided into multi-force balance and two-force balance, and the conditions for two-force balance are: the two forces are equal in magnitude, opposite in direction, acting on a straight line, and acting on the same object. Multi-force equilibrium is similar.

The difference between action and reaction and equilibrium force.

A pair of equilibrium with"Action and reaction forces"Common features:

Both forces are equal in magnitude and opposite in direction, acting on the same straight line. Because of this, students often confuse these two concepts.

Again, the difference is obvious:

First of all, the essence of the two concepts is different. The action force and the reaction force describe the law of action between two objects, A has a strong effect on B, and B must also have a strong effect on A; Two-force equilibrium describes the characteristics of two forces in which an object is in equilibrium under the action of two forces.

Secondly, the nature of the two forces is the same, either gravity, elastic force, friction and so on. However, the equilibrium of two forces is not, as long as the two forces are satisfied to act on the same object, equal in magnitude, in opposite directions, and acting in the same straight line, it is a balanced force, regardless of the nature of the two forces.

The re-action force and the reaction force are simultaneous, generating at the same time, changing at the same time, and disappearing at the same time; Two-force balance does not have this characteristic.

Necessary to maintain balance.

1.The magnitude of the force is the same.

2.In the opposite direction.

3.Actions (points) are on the same straight line.

4.The action (point) is on the same object.

What force is equilibrium?

An object is acted upon by two forces and remains at rest or in a state of uniform linear motion, these two forces are a pair of balanced forces, called two-force equilibrium!

Conversely, "If an object remains at rest or in a straight line at a uniform speed, the force on it must be balanced (or not)".

Gravity is simply the attraction of the earth to objects, it is gravitational but it is not exactly the same, you will learn in high school. Mass and gravity are two completely different concepts: mass is the mass of the substance contained in the object, that is, the molecule, whereas gravity is a force. Mass multiplied by g is equal to gravity g to take 1 kg of ox.

If you have any questions, you can ask them

Forehead... To put it simply... You take something and you feel the force you have to exert -- that's gravity ...

It's actually the gravitational force of the object and the earth, and I'm going to learn it next year...

Gravity is the attraction of the earth to objects, how can there be a balance force? It should be the balance of the force of the object, when the object is at rest or in a straight line at a uniform speed, it means that the object is not affected by the force or the object is balanced by the force.

According to the textbook, "the force exerted by an object near the ground due to the attraction of the earth is called gravity", and the direction is vertical and downward.

Upstairs is not accurate, but if you are in the exam, upstairs is sufficient.

But the fact is that gravity ≠ gravitational force, and the direction of gravity is not directed towards the center of the earth, unless you are at the poles, you will be subjected to the centripetal force, and gravity should be the gravitational force minus the centripetal force (vector subtraction) The direction is related to your latitude.

The force exerted by an object near the ground due to the attraction of the earth is called gravity.

Gravity is the force that the earth attracts to objects, and the force that causes objects to be exerted is gravity.

Gravity is the force of the earth on the object between the earth and the object.

Your weight is the force of gravity you are subjected to.

It may not be easy to estimate the gravity of an object, but if you have a certain understanding of the mass of the object, you can find its gravity according to the mass of the object;

1) Lifting a pound (500g) of eggs can generally weigh 8-10, so the mass of each egg is about 50g; Then the residual imitation force of an egg is about g=mg=;

2) Combined with the actual situation of the students, the mass of the general middle school students is about 50kg; According to the calculation formula of gravity, the magnitude of gravity can be calculated: g=mg=50kg, 10n, kg=500n;

So the answer is: (1)d, (2)c

The mass does not change, but gravity does.

The force that a person can provide is the same.

If you can lift a 2000n barbell on the earth, you can also lift a 2000n barbell on the moon, but because the gravity on the moon is only one-sixth of that of the earth, the 2000n barbell on the moon is brought to the earth, and it becomes 2000 6n = 12000n

That's 1200kg

Your teacher is wrong.

Listen to your physics teacher The mass of an object is constant, and the weight is constant.

It is true that mass does not change with a change in position, but mass and weight are two concepts: mass m multiplied by the acceleration of gravity g is equal to weight g

The gravitational acceleration of the Earth and the Moon is not the same, while the weight of what a person can lift is constant.

In other words, people can lift 2000n things all the time, but 2000n means 200kg on the earth but 1200kg on the moon, because the gravitational acceleration g of the earth and the moon is different.

1200kg, you can lift 2000n on the earth, you can lift 2000n on the moon, the gravitational force of the moon is 1 6 on the earth, so the mass that can be lifted on the moon is 2000n (10n kg*1 6) = 1200kg I hope it will help you.

What we call weight in our daily life refers to mass, which is measured in kg or g or kilograms.

In physics, basically everything with the word "weight" refers to the gravitational force on the object, so the weight also refers to the gravitational force, for example, a person's mass is 50kg, and g is taken as 10n kg, then his weight is 500n

Strictly speaking, weight should refer to mass.

We often say how many catties or kilograms (kilograms) someone weighs, and here, obviously, kilograms are the unit of mass. A kilogram is a kilogram, and a kilogram is half a kilogram, so kilograms and kilograms are both units of mass.

Weight refers to the mass in kg. Gravity = mass.

Gravity. Mass is the density of a thing. Size.

Not necessarily the same volume of iron and wood blocks.

2. Quality The more vegetables you buy, the heavier you feel.

3. The spring dynamometer tick is proportional to the g=mg position.

Hope it helps

Friends who ask questions on the mobile phone, please comment on the [satisfied] in the upper right corner of the client. Your adoption is the driving force for me to move forward

<> the string hangs down the weight, and the triangular ruler is perpendicular to the string and parallel to the tabletop.

Prepare another thread and hammer (something that sinks a little bit) and tie the hammer with the thread.

Stand up a right-angled edge of the triangular ruler and stick it on the desktop, and the other right-angled edge slightly protrudes out of the desktop, lift the hammer with a line, and stick the line on the other right-angled edge of the triangular ruler, if the line and the right-angled edge can be attached, then the desktop is horizontal.

g=mg=50kg×；

When he stands in an elevator that is descending at a constant speed, the brigade may be in equilibrium, the value of g remains the same, and the gravitational force is unchanged

So the answer is: 490; No change in dismantling and merging

Because the gravitational force on Earth is 6 times that of the Moon, the gravitational force on Earth g=

Because gravity g=mg, the mass m=g g=kg.