Physics, gravity, weight, mass

The amount of matter contained in an object is called mass. Mass is a property of the object itself, which does not change with the change of the shape, state and geographical location of the object, and is usually measured by a balance.

Weight is caused by the gravitational force of an object, and the weight changes with the change of geographical location, and the weight is usually measured with a spring dynamometer.

In daily life, people often understand "weight" as the mass of the object, but it must be noted that the "weight" in physics (such as "weight", "weight", "weight", etc.) refers to the gravity of the object, not the mass of the object.

The concept of gravity is superfluous, vague, and unscientific.

What is Gravity? 'Gravity is the gravitational force exerted on an object', which is the definition of gravity in all physics textbooks today. Obviously, this means that gravity does not include the object itself, but only the gravitational force exerted on it.

In other words, gravity is gravity. So, if you have gravity, why do you have to create gravity over and over again?

When it comes to the problem of sinking and floating, today's physics textbook says that 'buoyancy equals gravity', which is equivalent to saying 'buoyancy equals gravity'.

From the above analysis, it is not difficult to see that the concept of gravity is indeed superfluous, vague and unscientific.

Today, all countries in the world use 'weight' as a unit to measure the weight of an object, which shows the objectivity, importance and scientific nature of the concept of 'weight'. The absence of the concept of weight in today's physics does not mean that 'weight' does not exist objectively, but only shows that today's physics is not perfect and needs to be improved. For any scientific concept is only correct if it corresponds to reality; Any scientific theory can only have vitality if it can serve reality.

It's a given.

Objectively, weight should be equal to mass x gravity x velocity, i.e. m weight = mfv. When the object is relatively stationary, then m weight = mf.

The fundamental difference between weight and mass is that weight is a vector quantity with direction, so it changes with velocity; Mass, on the other hand, is just a directionless scalar quantity, so it can never change with velocity.

The reason why Einstein came to the wrong conclusion that mass and energy can be converted into each other --- more than 40 years according to the mass-energy relationship is that he has never been able to truly understand the true relationship between mass and weight.

It is necessary to grasp the key points to understand. Gravity is a force that is produced by the attraction of the earth, and the numerical representation of gravity is weight, and the unit is of course the unit n of force. The concept of quality is the unit of measurement of a few catties and taels in daily life.

Gravity: The force that an object exerts on an object due to the attraction of the earth, weight: The magnitude of the force that an object has in a straight downward direction under the action of gravity.

Mass: Indicates the amount of matter that an object contains.

Difference between weight and mass: unit of weight: n, mass: , g, t......, the physical meaning is different.

Gravity is the gravitational force of the earth multiplied by the mass of the object. It is a kind of force, mass, that is, the actual weight of an object in physics, weight, that is, the weight of an object in life, and the difference between weight and mass is that it is a quantity in physics. The other one is not.

The amount of matter contained in the substance is called mass, which has nothing to do with anything, the weight is the amount of gravity exerted by the earth on the object, and the gravitational force is different in different places, and the weight is different but the mass remains the same.

Weight is not said in physics.

In daily life, we buy some things and often say how many kilograms or catties they weigh. The weight here is actually the mass. Because the bench scale or rod scale used by the salesperson is a lever type of measuring tool like a balance, it can only measure the mass of the object.

In addition, when we buy something, we often care about the amount of substances it contains. That is, we care about the size of the mass, and the kilogram and the kilogram are also units of mass, so the weight in daily life is actually the mass.

And look here.

In physics, weight and mass are different, mass is the amount of material contained in the object itself, is a property of itself, and has nothing to do with the outside world, its units are grams, kilograms, tons, and often used in life, two, catty, kilogram as a unit; Weight is the force that an object is attracted by the earth in a certain place, it is a kind of gravitational force, it is a category of force, and its units are Newtons, thousand Newtons. In physics, gravity and mass are two different concepts, weight refers to gravity and mass refers to how many kilograms. But in life, people are more concerned about the amount of a certain substance contained in an object, so people often say that weight refers to mass.

Gravity is mg, that is, weight, mass is m, general mass multiplied by g is gravity, the main reason is that the gravitational acceleration g is not the same, although most of them are used or 10n kg, but g will change, there are hints in the question.

Neither mass does not equal weight.

The mass is measured by the balance, and the gravitational acceleration on the left and right sides of the balance is the same (i.e. g, m1g=m2g, and m1=m2 if g is about to fall), and is not affected by gravity.

Whereas, gravity refers to the mass of g = mg multiplied by the acceleration due to gravity.

Weight refers to mass, whereas gravity refers to the gravitational pull on an object from the Earth. The relationship between gravity and mass is g=mg (g is gravity, m is mass, g is kg and the unit of gravity is ox.

It refers to the mass that is often said, that is, the unit kilogram, gram, tael, catty, ton, etc.

This is physics, so pay attention to the physical expression when answering.

In physics, the gravity, weight, and weight of an object all refer to the gravitational force of an object, and the unit is n. Therefore, when doing the question, you should pay attention to the words, and if it is quality, you will definitely write "quality" instead of "weight".

In daily life, there is no need to make such a distinction, for example, during the physical examination, the unit of weight column is: kg

In general life, weight refers to the mass converted into a certain proportion by measuring gravity, and the unit is kg

In physics questions, if you ask "weight", it generally refers to the weight of an object, that is, gravity, and the unit is n

Weight in life refers to 'mass' and is measured in kilograms or kilograms.

Body weight in physics refers to the gravitational force experienced by the body, and the unit is.

n (cattle).

The gravitational force of an object in kilograms ———g=mg=

The range has been exceeded, so it can't.

How heavy a person can lift is, scientifically speaking, related to the gravity of the object. Since g (earth) = , g (month) = (, according to the principle that the maximum gravity that can be lifted to the moon is constant, is also 980n, let x kilograms of matter be subjected to gravity on the moon is 980n, then the equation (holds, and the calculation gives x = 600 (kg).This is not wrong, you have to find the amount of matter with the maximum gravity that a person can lift, not the weight with the same amount of matter, because the gravity of the moon is 1 6 of the earth, then 100kg of material on the moon is not 980n, but (980 6) ox. This is only 1 6 of the maximum weight he can lift, and the only way to keep it the same is to increase the amount of matter to 6 times, that is, 600 kilograms.

There are two concepts here: gravity and mass.

Mass: The physical properties of an object that are not altered by any external factors.

Gravity: Mass Gravitational acceleration g

You feel gravity, the mass doesn't change. For example, a 60kg object is 60kg on Earth and 60kg on the Moon.

But on Earth you lift it by gravity: 60kg 10 (the acceleration of gravity on Earth); The Moon is lifted by gravity: 60kg 10 6 (gravitational acceleration of the Moon).

The amount of pressure this man can withstand remains the same (i.e., his strength does not change) at 980N.

Whereas, the acceleration of gravity on the Moon is 1 6 of that of the Earth

The mass of an object weighing 980N is 600kg

Your problem lies in the lack of a proper understanding that the mass of an object does not change depending on the position of the object, and that it is the gravity of the object that is directly perceived rather than the mass.

Because gravity refers to mass, mass is related to density and volume, and has nothing to do with location, so it is 980n

On the Moon, the density and volume remain the same, but kg is related to the gravitational constant, which is related to the mass (the mass does not change), and the gravitational constant on the Moon is 6 times that of the Earth, so it is 600kg

This person can lift an object of 980N, which means that his maximum support force is 980N, and his force (support force) will not change when he reaches the moon, and the gravitational force of the moon is one-sixth of that of the earth, so it is 600kg

You've found the wrong reference, and the only thing that doesn't change is the maximum support of people.

You can also think of it this way, he lifted 100kg on the earth and had a force of 980n downwards, but by the moon there was only a force of 980 6, and the force downwards became smaller.

Newton is the unit of force, weightlifting looks at the force received, and the force is constant.

And the gravitational acceleration on the Moon becomes smaller, and the same gravity represents greater mass.

For the same person, he can lift many things on the earth, and he can also lift them on the moon, but this gravity --- refers to gravity, and the relationship between objects and people is reflected in the force. Just as a person can jump higher and farther on the moon with the same force (as opposed to more mass).

c.Equal to an object weighing 600n.

Human strength will not change, and it is still possible to carry such heavy things. It's just that something that is the same weight will have 6 times the mass of the earth.

c Because human power does not change, the gravity of the object that can be moved does not change, except that it has twice as much mass on the Moon as it does on Earth.

Choice A, because the mass of the object is constant, so the person who can move an object weighing 600 n on the earth is actually moving an object of about 60 kg. And because the gravitational pull on the surface of the Moon is 1 6 of the Earth, the gravitational acceleration (i.e., g) is 1 6 of the Earth. According to the formula of g = mg, it can be concluded that the gravity of a 60kg object on the moon is about 100 N.

This man can move 600 oxen of objects, so he can move objects larger than 600 n on Earth.

Option A, the mass of the object is constant, whether on Earth or Moon. But the weight changes according to the change in gravitational force. The two are directly proportional.

So since the gravitational pull of the Moon is 1 6 of the Earth, when the same object moves from the Earth to the Moon, the mass does not change, but the weight becomes the original 1 6, so an object greater than 600n can be moved on the Moon.

b, because there is no gravity in space, any object can float around, so the mass must be small.

Choice A, because the power of man remains the same, so it can lift objects greater than 600n on the moon.

b If the gravitational acceleration is 10, the mass of this thing is 60kg, and the mass of the thing is unchanged, the gravitational acceleration is one-sixth, and the weight becomes one-sixth, which is less than 600n

The baked cake on the first floor won't answer randomly.

The gravitational force refers to the gravitational force on which he himself is subjected, which is 20n, not the pressure of other objects.

The pressure on the ground is a gravity plus b gravity, which is 50n

2.The same goes for 10n and 15n, respectively

A is subject to gravity b gravity, i.e., 30n, and the bottom pressure is the sum of ab, i.e., 30 + 20 = 50n

The gravity of the bottle is the gravity of the water, i.e. 5n, the ground pressure is the sum of 2, i.e., 5+10=15n

Mass is the amount of material contained in the object, and it is not related to the position of the special body, that is, 1kg of iron is 1kg when placed in **, not more or less.

But gravity is a force generated due to the attraction of the planet to the object, and its size is proportional to the mass of the object, but on different planets, the gravitational force on the same object is not the same, such as on the earth, the gravitational force of 1kg of iron is 10n, but on the moon, because the attraction of the moon is small, the gravity also becomes smaller, only.

In junior high school, the pressure is generally on the horizontal plane, so the amount of pressure is equal to the amount of gravity.

Gravity Since there is a gravitational force between the earth and the object, the gravitational force of the earth acting on the object is the gravitational force of the object.

Pressure is the force of direct contact between two objects that occurs on the contact surface and usually has a reaction force in the opposite direction – the supporting force.

There is no necessary connection between the two, when the pressure on another object is generated by the gravitational force of an object, the pressure is the result of the action of gravity; If you push an object against a wall with your hand, the pressure of the object on the wall has nothing to do with gravity.

The mass is determined by the object itself, and its size depends on the amount of matter; Gravity is determined by mass, which is equal to the mass of the object x the acceleration due to gravity; Pressure is generally equal to gravity!