Why is the acceleration and velocity in the same direction, the smaller the acceleration, the greate

You're talking about a process, right?

Accelerated motion with reduced acceleration.

The smaller the acceleration, the longer the elapsed time, and the greater the cumulative velocity because the velocity is increasing all the time.

When the acceleration finally decreases to 0, if it does not change, then the object moves at a uniform speed and no longer accelerates, so this is the time when the velocity is maximum.

The team will answer for you.

The acceleration and the direction of velocity are consistent, that is, the combined external force and the direction of velocity are consistent, and the combined external force is the driving force, which accelerates the object, even if the combined external force decreases (acceleration decreases), the velocity must increase.

Velocity and acceleration are both vector quantities and have magnitude and direction.

Whether the magnitude of the velocity increases or decreases depends on whether the direction of the acceleration coincides with the velocity.

Consistency increases the velocity, and vice versa.

The speed changes depending on the magnitude of the acceleration (note the speed of the change), and the greater the value of the acceleration, the faster the speed changes.

The smaller the value of acceleration, the slower the velocity changes.

Acceleration describes the change in velocity, and when the two directions coincide, it is acceleration. Just like a person grows taller, although he grows slower and slower, he gradually increases in height, and when you don't grow long, it is when you are at your highest. When the acceleration is zero, the velocity is maximum.

Acceleration is a vector, if it is consistent with the direction of velocity, the greater the velocity, because f=ma, it means that the force is consistent with the direction of motion, which is equivalent to pulling the object, so for acceleration, it is regarded as acceleration or deceleration, and it depends on whether the direction of acceleration is consistent with the direction of velocity.

First of all, we need to know what acceleration is, which is the ratio of the amount of velocity change to the time it takes for this change to occur (v t), which is the physical quantity that describes how fast or slow the velocity of an object changes, and the popular point is how much the velocity can increase in one second, so when the acceleration and velocity are in the same direction, even if the acceleration decreases, as long as it does not decrease to zero, then the velocity will increase, knowing that the acceleration decreases to zero, the velocity remains the same.

It is recommended that you take a good look at the textbook and understand the two concepts of velocity and acceleration well, and you will be able to understand it.

There is no correspondence between the magnitude of acceleration and the magnitude of velocity.

This is only true when there is an acceleration motion with less and less acceleration, and this is not a uniform acceleration motion.

That's what you see, and there's a big premise, if not, it's not true at all.

Here are three examples:

1.For an object moving in a straight line with uniform deceleration, the acceleration is exactly the opposite direction of the average velocity.

2.For an object moving in a regular circle at a uniform velocity, the acceleration is always directed towards the center of the circle, and the average velocity is tangent to the circle at all times.

3.The acceleration of the object is straight downwards, and the velocity of the object is tangent to the parabola.

Acceleration is a vector quantity that reflects the change in the velocity of an object per unit of time. The average velocity reflects how fast or slow the object is moving over a period of time.

Answer: First of all, let's talk about common sense, velocity and acceleration are vectors, that is, they have directionality; The state of ordinary objects is divided into rest and motion, and motion is divided into uniform speed and variable speed motion, and variable speed can be divided into uniform speed and non-uniform speed movement. The essence of acceleration is the result of the action of force.

The change in the state of an object is the result of the action of an external force.

The subject's first question: Does the object accelerate when the change in velocity coincides with the direction of velocity? My understanding is that the subject asks: the direction of velocity does not change, and the value changes, so is the acceleration applied to the object the same as the direction of the velocity of the object?

Answer: It may not be consistent, when the velocity decreases, the direction of acceleration is reversed; The speed increases, and the direction of acceleration is the same.

The second question: Isn't the acceleration the same as the change in velocity, why can only acceleration be consistent with the direction of velocity?

The consistency or correlation between the direction of acceleration and the direction of velocity is determined by the direction of the force, such as braking, the direction of acceleration and the direction of velocity are opposite. You can't see the velocity produced by the acceleration of the frictional force, you can only see the result of the resultant force of the action, the velocity becomes smaller, so you can't look at the change of the velocity of the object n generated by the acceleration at a certain point in time, it should be understood that there is only one value and one direction of the velocity of the object at a time point, but there is not only one force, the next time point may all change, and the interval between these two time points may be infinitely small.

The first question of this question: Isn't acceleration the same as the change in velocity?

Again, acceleration and velocity are determined by direction, and it makes no sense to talk about vectors aside from direction.

It can be understood in this way in an infinitesimal period of time, but it cannot be understood in such a singular way if it is not an infinitesimal time period. For example, in reality, an iron ball falls from a high altitude, it is subject to gravity, the air friction caused by gravity, and the wind, the wind is likely not perpendicular to gravity, so there is also the air friction force that comes from the wind, and the wind force may continue to change.

Summary: A deep understanding of inertia and force is the key to learning speed and acceleration.

Acceleration" and "deceleration" and "acceleration" in "acceleration" are not the same thing.

Acceleration refers to the absolute increase in velocity and hence acceleration is acceleration if and only if the velocity and acceleration are in the same direction.

Acceleration only refers to the rate of change of velocity, and deceleration also has acceleration.

Not necessarily, it should be: the greater the acceleration, the greater the rate of change in the velocity of the object, both in size and direction.

For example, in a uniform circular motion, the instantaneous velocity change before and after one revolution is 0, but there is obvious acceleration.

Another example: an object accelerates from rest to a very large velocity, and then decelerates evenly, and when it comes to rest, the velocity changes by 0, but there is obviously acceleration, and it has nothing to do with its magnitude.

As can be seen from the above, the so-called "change quantity" is a time-related change accumulation process, while acceleration is an instantaneous quantity, so there is no necessary limiting relationship between them.

Acceleration is the rate of change of velocity. The change in acceleration (magnitude, direction) is not directly related to the change in velocity, but only the speed of the change. For example, on the same straight line, when the velocity is 10 and the acceleration is 5, the object does an accelerated motion, and when the acceleration decreases from 5 to 1, the object still accelerates; If the acceleration continues to decrease, when the acceleration is 0, the object will move in a straight line at a uniform velocity.

That is, "the object keeps accelerating from 5 to 0, but the acceleration becomes flat (the increment of velocity per unit time becomes smaller)"; Also, if the acceleration continues to decrease, from 0 to -1, then the velocity of the object decreases (the direction of acceleration is opposite to the velocity), but the direction of velocity does not change immediately until the velocity becomes 0; If the acceleration of -1 is still maintained, the velocity begins to reverse.

An in-plane analysis can be seen as the vector sum of two non-collinear lines moving separately. For the effect of acceleration magnitude and direction change on velocity, the following examples can be given:

1) Do not change the acceleration magnitude, do not change the direction, the initial velocity and acceleration are collinear, and the object does a uniform speed or uniform linear motion (uniform speed change (a!).=0 and a constant) constant velocity (a=0)).

2) Projectile motion: do not change the acceleration (constant g), do not change the direction, the initial velocity and acceleration are not collinear (if the initial velocity is perpendicular to the acceleration, it is a flat throw, and the other is an oblique throw), and the trajectory is parabola.

3) Change the magnitude of acceleration, do not change the direction, the initial velocity and acceleration are collinear, and the object moves in a linear motion with variable speed.

4) Uniform circular motion: change the magnitude of the rubber in the acceleration without changing the acceleration (the uniform circular motion is a special case of this situation, and it is also necessary to meet the acceleration moment perpendicular to the velocity (initial velocity) and the acceleration magnitude is equal to v 2 r).

5) Variable speed circular motion: change the magnitude of acceleration and change the direction of acceleration (also a special case, it is also necessary to meet the component of acceleration in the vertical direction of velocity is equal to v 2 r).

In fact, for the same object, acceleration actually reflects the magnitude and direction of the force on the object. Force is the cause of acceleration of an object (f = ma, a is proportional to f when m is a certain time), and if it is difficult to analyze the acceleration analysis, the motion state of the object can be analyzed by force.

Hope it helps

If the direction of acceleration coincides with the direction of velocity, the object accelerates and vice versa. Acceleration is the ratio of the amount of velocity change to the time it takes for this change to occur δv δt, which is a physical quantity that describes the speed change of an object, and is usually expressed by a.

Speed has direction. Velocity is a physical quantity, and velocity can not only represent the speed of an object's motion, but also the direction of motion of an object. The velocity is still a vector, if the magnitude is 0, it means that it is stationary, then the direction is arbitrary, and it is not of research significance at this time.

There are also positive and negative directions for velocity, and if a positive direction is selected, a negative velocity indicates that the direction of velocity is opposite to the positive direction.

1. The direction of acceleration is not the same as the direction of velocity change, but must be the same;

2, acceleration, this Chinese translation, half right and half wrong. But there is no way, it will be wrong.

The translation of acceleration only translates that there is a change in velocity, an increase, and even if this increase is a negative value, in algebraic terms, it is still an increase, an increase in a negative value.

The real meaning of acceleration is the speed of the increase, that is, how fast the speed increases, acceleration is the speed of the increase, and the translation of acceleration is dead and static.

of say the increase of the increase, but not the speed of the increase.

3. It is the Chinese expression of this acceleration, although it is only half of the translation, and this half is just right.

The landlord's question, because acceleration is the increased velocity, and the direction of acceleration is the direction of increasing velocity, which is the direction of velocity change. Was the landlord prescient, or was he crooked? The landlord's problem is exactly 100%.

It matches the Chinese meaning of the three words acceleration.

Hello, yes, the direction of acceleration and the tangent direction of velocity are the same, and the direction is the direction of change of velocity.

Questions. <>

Hello teacher, is this question a B?

Let me see. Hold on.

Yes, no problem with B.

Because the direction of acceleration is at a certain moment.

Questions. Acceleration.

Isn't the direction of acceleration the direction of velocity? How could it not be?

It is not necessarily the same, but it can only be said that acceleration is the amount of change in velocity at a certain moment.

Let me give you an example.

For example, an object moves in a circular motion.

The direction of its acceleration changes from moment to moment.

But if the speed is a week last night, the speed is 0

Questions. Oh oh oh, got it.

Got it, well, can you give it a thumbs up, thank you.