Relationship between speed and weight The relationship between speed and mass

When the velocity of the object is less than the speed of light, the mass of the object has nothing to do with the velocity, that is, the mass of the object does not change with the change of velocity; If the speed of an object is greater than or equal to the speed of light, it is a matter of relativity, but it is certain that the mass will change!

The weight mentioned in the title is the product of the mass of the object and the acceleration of gravity. Example: An object weighs 6 times as much on the Earth as it does on the Moon!

Note:1the relationship between quality and speed;

2.The difference between weight and mass.

It is impossible for a train with a high speed to reach the speed of light, so its mass is constant, while it is traveling on the ground and the acceleration of gravity is constant! So, the weight of the train does not change!

I think what the predecessors said"It doesn't matter"It's both concise and accurate!

Speed and weight don't matter, but inertia and weight do.

Instantaneous efficiency p=mv... There is arguably no necessary relationship between them, but together they influence other elements of the movement.

The train is not fast enough to consider the relativistic effect, and it is accurate to think that it is okay.

There is no need to consider the relative effect, the velocity of the relative effect needs to be considered very large, the formula m=m is at rest root number 1-v 2 c 2

m=m stationary root number 1-v2c2

But the theory of relativity doesn't make much sense at low speeds, right?

Correct the concept.

Weight is quality. The gravitational force is equal to the mass multiplied by the previous gravitational acceleration.

Gravitational acceleration on the Earth's surface is usually equal to meters per square second.

The unit of gravity is the ox, and the unit of weight or mass is kilograms, grams, tons, and so on. Most of us usually use weight, and rarely gravity. But the way we weigh the weight is generally to measure the gravitational force and divide it by the gravitational acceleration.

For example, spring scales and other kinds of scales are all measures of gravity.

Gravitational acceleration is slightly different at different latitudes, and also varies at different altitudes. Therefore, after using this kind of Huinai code scale to adjust to zero, if it moves in a wide range, it will be inaccurate. And it can't be used to leave Earth to go to other planets.

The balance scale is a direct measure of mass, so it can also be used on extraterrestrials.

m＝m.Divide by [1-(u c) 2] under the root number

m.is the rest mass of the object, u is the speed of the object's motion, and c is the speed of light.

u c) 2 represents the square in parentheses.

Report. To put it simply: acceleration due to gravity.

It has to do with the mass of the Earth, not anything else.

Drill down: Gravitational acceleration.

First, it is related to the factors of the earth, such as:

1. The object is in the position of the ground search.

For example, due to the rotation of the Earth.

The reason for gravity is the gravitational pull of the earth on an object.

One component is the centripetal force required to supply the object to rotate around the Earth.

1) The linear velocity of an object at the equator as it rotates with the Earth.

If the centripetal force required is large, the gravitational force will be small, and the gravitational acceleration will be small.

2) When going to the poles, the linear velocity of the object rotating with the earth becomes smaller, and the centripetal force required becomes smaller, and the gravitational force is divided, and the gravitational acceleration becomes larger.

3) When the pole is reached, the linear velocity of the object rotating with the earth is the smallest, and the centripetal force required is the smallest, then the gravitational force is the largest, and the gravitational acceleration is the largest.

2. The higher the height of the object from the ground, the smaller the gravitational acceleration, because gravity is a component of the gravitational force of the earth on the object, and the main component of this gravitational force is gravity, the magnitude of the gravitational force is inversely proportional to the square of the distance, the higher the object is from the ground, the greater the distance between the object and the center of the earth, the smaller the gravitational force, the smaller the gravitational force, so the smaller the acceleration;

3. If it is a deep hole in the ground, the deeper it is, the smaller the gravitational acceleration, and when the object is at the center of the earth, the gravitational acceleration is theoretically "0", which is according to theoretical mechanics.

of the repentant faith obtained.

Second, it is related to the attraction of alien stars, such as the attraction of the sun and the moon to the earth, which reduces the gravitational force of the object and makes the gravitational acceleration smaller.

Have you studied the physical formula of gravitational attraction between two objects? :f=where m and m are the masses of the two objects, respectively.

I let m be the mass of the earth and m be a mass of five blocks. Then the gravitational force received by an object near the ground is equal to the gravitational force of the earth, i.e., mg=gmm (r 2).

Eliminate both sides to get g=gm (r 2).

So the acceleration due to gravity is related to the mass of the earth m.

It's detailed enough, don't you know how to ask me again, I hope it will be better to type so many words and add some points!

The unit of weight is n, kn

The unit of velocity m s

Is it weight rather than mass?

Weight commonly used:

N kgf kgf

lbf lbf

The weight at this time is due to the absorption of the earth. In fact, it is also the gravitational force. The weight g of an object of mass m is equal to the gravitational force f that the object is subjected to by the earth

g after g=f=gmm r 2 is the gravitational constant, m is the mass of the earth, and r is the distance of the object to the center of the earth.

From this formula, it can be seen that the weight of an object at infinity is 0The closer you get to the Earth, the greater the gravity. But it does not increase indefinitely, only to the surface of the earth. It is to take r=r the radius of the earth.

Why? No, it won't.

The mass of the object does not affect the velocity of the object.

The mass of the object affects the acceleration of the object: f=ma (for the same force, the greater the mass m, the smaller the acceleration a).

The velocity is calculated by the ratio of the amount of change in displacement to the amount of change in time, i.e., v=x t. However, velocity is the ratio of the result operation, and has nothing to do with displacement and time, in other words, the magnitude of displacement and time cannot determine the magnitude of velocity, just like the resistance in physics, it is calculated by voltage and current, but it is not related to voltage and current, but is related to the material, temperature, cross-sectional area, length and so on of the resistance.

And the main factor influencing the speed is acceleration.

is the acceleration of weight. Because mass is a property of matter and is unchanging. Weight is a phenomenon that is proportional to the mass of matter due to different gravitational forces, or a new unit of measurement produced by mass and gravity.

For example, the weight of the earth and the moon is different, and the acceleration generated is different. Why not say gravity? Because gravity only refers to the phenomenon of acceleration in the direction of the perpendicular ground, while in nature there is an acceleration phenomenon in all directions.

is the acceleration due to gravity, constant g.