Free fall should be in constant motion, how to understand gravitational acceleration?

As far as motion is concerned, our friends who have studied physics must know that there is no absolute rest, only absolute motion, and rest is just a special state of motion, called relative rest, in fact, it is also because the earth is constantly moving, which is the so-called rotation, thereforePeople will wonderFree fallIt should be moving at a constant speedHow to understand gravitational acceleration.

In fact, the free fall body does not move at a uniform speed, but is affected by gravity, and the acceleration of gravity is the force given by the earth.

First of all, let's put the goal in the perspective of the universe, in the universe the earth is not a special existence, but it is normal to be a small planet, not to mention the planet in the universe, even the galaxy.

After all, the universe as a whole is also a system, and the most important thing is to maintain the stability of the system, so there is a force between the planets, which is the gravitational force we are familiar with.

And the earth itself is also affected by this force, which is not only reflected in the orbit of motion, but also the rotation, so that we can see day and night.

So the earth is constantly rotating every day, we can't say that it's really stationary, the so-called rest is a relative state of motion, we need a reference object, for example, we sit on the train, looking at the scenery outside, we must be in motion, but compared to our seats, we are stationary, this is a relative state of motion, and all objects on the earth, as long as there is mass, will have the effect of gravity.

That is, we are familiar with the value g, which is the effect of a force, which naturally has a strong effect on the movement of the free fall, and there is acceleration, so the free fall is not a uniform motion, but a motion in which the acceleration remains unchanged, so the velocity kinetic energy will be larger and larger, which is because of the action of gravity.

Free fall is a uniform acceleration, gravitational acceleration is the speed at which an object falls increasing every second, while free fall is a slow acceleration process, but the weight added is the same every second.

Free fall is not a uniform motion, but a uniform acceleration motion, and gravitational acceleration refers to the amount of change in velocity per unit of time.

Free fall is a uniform acceleration motion, and the meaning of gravitational acceleration is that the speed of the object falling keeps increasing by a value of one gravitational acceleration per second, so free fall is a motion that has been accelerating, but the speed of acceleration per second is the same.

Free fall motion is a uniform acceleration motion.

That vertical upward throw evenly slows down.

Bungee jumping (regardless of air friction) gravity is always present, and the force of the rope is generated when it exceeds the original length, and the magnitude of the force increases although the amount of growth increases.

In the state of motion, it begins to be subjected to only gravity, and does a downward motion with uniform acceleration of g.

After descending to the original length of the rope, it is subjected to the upward pull of the rope. However, at the beginning there is an initial velocity (which determines the continuation of the downward movement), and the tension at the beginning of the rope is small and the gravitational force (which determines whether the acceleration and acceleration are downward, but it becomes smaller), so it still does a downward movement with variable acceleration (but not uniform acceleration).

Continue to descend until the tension of the rope is equal to the gravitational force, and then the upward tension is greater than the gravitational force, and the resultant force is upward, and there is a downward initial velocity, so do a downward uniform deceleration motion until the velocity is reduced to 0 (and then there is a symmetrical opposite motion process).

Then turn around and do a uniform acceleration upward, then an upward acceleration with a decreasing acceleration and then an upward uniform deceleration with acceleration g and then change to the initial state, and then the cycle.

It can also be studied by considering the transformation of gravitational potential energy, kinetic energy, and elastic potential energy from the perspective of ability transformation.

In fact, bungee jumping and spring are the same, which can be compared and analyzed.

Now you follow up on the questions you ask others.

The initial velocity of the vertical upward throw is not 0, and the acceleration is always g

Teach you a way to think about a similar problem by using a hypothetical approach.

Imagine that the initial velocity is 0, and you know that the acceleration is g downward.

Ideally, the free-fall motion is a linear motion with uniform acceleration.

In real life, due to the effect of air resistance and the principle of fluid mechanics, the faster the falling speed, the greater the air resistance - so there is no uniform acceleration linear motion.

Yes. The acceleration of the motion of the free fall is the acceleration of gravity g. The acceleration of gravity at a certain place is constant, and the direction of motion perpendicular to the ground is also constant, so it is said to be a uniform linear motion.

Yes, at a certain height it can be approximated as a uniform acceleration linear motion, and the acceleration is g. However, if the altitude is very high, the friction with the air will change due to the high speed, and it will accelerate in a straight line. For example, a spaceship returning from space.

The acceleration of a free fall is g, which can be seen as a constant in the same place on the earth, so free fall is a uniform acceleration in a straight motion.

No. The free fall motion is a uniform acceleration motion, that is, the falling speed is faster and faster the further down.

The motion of a free fall is a linear motion with uniform acceleration.

Yes, it must be a uniform acceleration linear motion.

Gravitational acceleration.

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

1. The position of the object on the ground.

For example, due to the rotation of the earth, gravity is a component of the earth's gravitational pull on an object, and another component is the centripetal force required to supply the object to rotate around the earth.

1) If the linear velocity of the object at the equator is large and 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 obtained according to the principle of theoretical mechanics.

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.

1.Both the buoyancy and drag of the air in the experiment have an impact on the results. Air buoyancy is an upward force formed due to the difference in pressure of a liquid or gas that can reduce the true weight of an object.

In experiments, if the air buoyancy Hu Shanfeng is not taken into account, the mass of the object will be overestimated. Whereas, drag is the force generated by the collision of a moving object with air, which will cancel out the speed of the object's motion, resulting in a slowdown in the falling speed of the object's pants. Therefore, if drag is not taken into account during the experiment, the resulting gravitational acceleration value will be lower than the real value.

2.When measuring gravitational acceleration using the free-fall method, you first make the object to fall freely, and then calculate the gravitational acceleration by measuring the fall time. The principle of this method is to take advantage of the effect of gravitational acceleration on the vertical free fall of an object.

In free fall, ignoring the influence of external forces such as air resistance and buoyancy, the falling speed of the object will continue to increase, and its acceleration is the gravitational acceleration. In order to reduce the error, it is necessary to use a precise timer and take measures to prevent the object from other external interference during the experiment.

Because v=v0+at

So v 2=v0 2+a 2*t 2+2*v0*at, so v 2-v0 2=a*t*(v-v0)+2*v0*atat*(v+v0).

at*2*v.

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Note: The free-fall dust chaotic motion is a uniform acceleration straight positive line motion with zero initial velocity, which follows the law of linear motion with uniform variable speed.

1) The whole process is processed: it is a uniform deceleration linear motion, with the upward direction as the positive direction, and the acceleration takes a negative value;

2) Segmented treatment: upward is a uniform deceleration linear motion, downward clearing is a free fall motion, with symmetry;

3) The process of ascent and fall is symmetrical, such as the equivalent reversal of velocity at the same point.

Conventional objectsThe motion with zero initial velocity only under the action of gravity is called free fall motion.

At this time the objectOnly by gravity(non-equilibrium force), and the gravity is constant, and the direction of motion is the same as the direction of gravity, so it is a uniform acceleration linear motion.

Its acceleration a=g m=mg m=g

Because the resultant force received is constant, the acceleration is constant, so it is a uniform acceleration motion.

Not in all cases the free fall motion is a uniform acceleration motion, only the air resistance is negligible in the ideal state, the object at a certain height is only affected by the action of gravity. It's called "free fall"!

The reason is: there is a gravitational force between any two objects, and the gravitational pull of the earth on the object causes its free fall, and the free fall motion is a uniform acceleration linear motion with zero initial velocity and acceleration g g, and the principle of motion is related to the force, and the free falling object must be under the premise of ignoring air resistance.

Not all the reasons can be explained, and the free fall cannot say why, which is the data obtained by Newton's many experiments, the object is in a state of almost zero air resistance is doing a uniform acceleration motion, there is no why. Hope it helps.

Because the direction of acceleration is vertically downwards and the direction of gravity, the acceleration of free fall motion is equal to the acceleration of gravity.

The concept of free fall motion is that free fall motion is a uniform accelerating linear motion with zero initial velocity, and the acceleration of free fall is an invariant constant. It is a uniform accelerating linear motion with zero muzzle velocity, and its acceleration is always equal to the acceleration g due to gravity.

a＝g＝

The acceleration of a motion that is only affected by gravity during free fall is the acceleration of gravity g = meters per square second.

Is that what you want to ask?

Equal to the acceleration of gravity, constant value, generally taken or 10

It's just going to fall down and snap.