Regarding the question of velocity in the physics of high school the direction of velocity is the d

There are no special conditions and descriptions, velocity must refer to instantaneous velocity, for example, in high school it tells you to find where or how the velocity of an object, here refers to instantaneous velocity, you have to answer the speed and direction Generally, you will not be asked to find the average velocity, and it has no meaning for the study of motion.

This statement is true, whether it is an average velocity or an instantaneous velocity, the direction of its velocity is the direction of motion. Instantaneous velocity is well understood as the tangential direction of that point, and average velocity is the direction of the line between the start and end points.

This sentence here refers to instantaneous velocity, and if it is the average velocity, the line between the beginning and the end point is the direction of motion.

The average velocity refers to the average velocity per unit of time and is derived from the formula velocity = displacement time.

Instantaneous velocity refers to the instantaneous state of velocity.

Is there anything else the landlord would like to ask?

I hope to be been.

Speed definitely refers to instantaneous speed. Mean velocity refers to the time removed from the bit, and when the time approaches 0, the average velocity is equal to the instantaneous velocity.

The direction of velocity is the direction of motion, the direction of velocity is related to the direction of motion, and the direction of displacement is only related to the starting position and the end position.

Velocity is a vector that represents the speed and direction of motion of a moving point at a certain moment. In the simplest uniform linear motion, the magnitude of the velocity is equal to the distance traveled per unit of time. Common units of velocity are:

centimeter seconds, meter seconds, kilometers and hours, etc. The magnitude of velocity is also called velocity.

The distance traveled by an object per unit time is called velocity, velocity is a physical quantity that indicates the speed of the object's motion, the velocity direction is the direction of motion of the object, and the velocity direction of uniform linear motion is constant.

1. Velocity is a physical quantity that indicates the speed of an object's motion, and the direction of velocity is the direction of motion of the object.

2. The displacement is the directed line segment from the initial position to the last position of the object's motion, and the direction of the displacement is not necessarily the same as the direction of the velocity.

3. The magnitude and direction of the velocity of uniform linear motion are constant.

Analysis] This question tests the student's understanding and mastery of the direction of velocity, and the magnitude and direction of velocity of uniform linear motion are constant. It is a basic topic.

The saying "the direction of velocity is the direction of motion of the object" is true.

The tangent direction of a point in the trajectory of an object is the direction of velocity at that point.

The direction of motion is generally the tendency of the object to move, and it can have two kinds of reasons The direction of motion of the object at an instant (at a certain time t or at a certain position x). The direction of motion of an object within a certain time interval δt. The direction of motion of the former is the direction of the velocity (instantaneous velocity) of the object, which is an instantaneous motion trend of the object; The direction of motion of the latter is the direction of the average velocity within time δt, which is equivalent to the direction of displacement of the object.

The instantaneous velocity is the first derivative of the bit-vector r, a directed line segment that points from the origin of coordinates to a certain location: r', (displacement δr=r2-r1) is the rate of change of the vector with time, and its direction does not necessarily coincide with the direction of displacement (analogy with acceleration vs. velocity).Instantaneous speed:

v=r'=dr dt, the instantaneous direction of motion is consistent with the instantaneous displacement of the object microelement dr direction. As for the direction of motion of the object in δt, it is consistent with the displacement, which can also be seen from the formula v=δr δt for the average velocity.

Therefore, the saying "the direction of velocity is the direction of motion of the object" is convincing. It's just that when we understand this sentence, we have to use different "directions of motion" and corresponding "directions of velocity" to understand them.

The direction of motion is divided into instantaneous direction of motion (i.e., velocity direction) and direction of motion over a period of time (i.e., displacement direction), so the direction of motion is the direction of velocity and the direction of displacement, and the son will certainly be different than the son.

The direction of velocity is the direction of the object's motion, and the displacement is only related to the start and end points, so the direction of the displacement is not necessarily the same as the direction of velocity.

1.First of all, acceleration is the ratio of the amount of change in the velocity of an object to time.

2.So, if the velocity is positive, if the acceleration is reversed, then the acceleration is negative, and the amount of change in velocity is negative, so the velocity decreases.

3.Then, if the velocity is negative, the acceleration is positive, the amount of change in velocity is positive, and the absolute value of the negative number plus an absolute value less than its positive number is less than the absolute value of the original negative number, i.e., the velocity magnitude becomes smaller.

4.Finally, when the deceleration is reduced to 0 m s, it will start to accelerate, but at this time, the direction of the velocity is already opposite to the original velocity direction, that is, it is the same as the acceleration direction, and if it is opposite to the acceleration direction, it will still slow down.

Acceleration is the derivative of velocity versus time, which indicates the physical quantity of how fast or slow the velocity changes, and its direction indicates the direction of change of velocity, and if it is in the same direction as velocity, the velocity increases, and vice versa, the velocity decreases.

The direction of acceleration when the object is decelerated is indeed opposite to the direction of velocity;

The most important thing is to look at the direction of acceleration first, the same direction as the velocity is the acceleration motion (even if the acceleration is decreasing), and the reverse direction is the deceleration motion.

High School Physics 16 The Relationship between the Direction of Acceleration and the Direction of Velocity Compulsory 1.

Direction determination of acceleration:

1. It is in the same direction as the resultant force of the object.

2. The same direction as (end of v - beginning of v).

3. If the object is in accelerated motion, the acceleration direction is the same as the initial direction of v.

4. If the object is in deceleration motion, the acceleration direction is opposite to the initial direction of v.

Speed direction determination:

1. In linear motion, the "direction of velocity" is the "direction of motion" of the object.

2. In curvilinear motion, the "velocity direction" follows the "tangential direction" of the object's motion.

The direction of movement is the direction of speed! Acceleration depends on the force! The force exerted, note: resultant force. The direction is both the direction of acceleration! Codewords are hard....

The direction of motion is the direction of velocity, the direction of force is the direction of acceleration, and the deceleration motion is opposite.

The direction of acceleration is the same as the direction of the resultant force on the object, just look at the direction of the force and the direction of the velocity.

Acceleration looks at the force experienced by the object, the direction of the force is the same as the acceleration, and then compare the direction of force and velocity!

Acceleration is in the same direction as the force, and the velocity is not necessarily the same as the direction of the force.

Instantaneous speed:It refers to the speed at a certain point in time. Regardless of whether the object was accelerating or decelerating at that time, its instantaneous velocity was in unison with the direction of its motion.

Because when the velocity is changed to zero by the acceleration of the opposite wide volts, it stops, and while the acceleration is still there, the direction of its velocity also changes, and the direction of motion changes. Therefore, the instantaneous velocity is consistent with the direction of motion of the object.

The direction of the average velocity of the object is not necessarily the direction of displacement of the object, and when the object moves in a straight line, the two are the same.

The instantaneous velocity direction is the direction of motion of the object, and the average velocity direction is not necessarily the direction of motion of the object, see the above sentence.

The direction of displacement of the object is not necessarily the direction of the object's motion, when the object moves in a straight line, the direction of the two is the same.

If it is a linear motion, the direction of these five is the same.

The direction of the instantaneous velocity is the direction of the object's motion, and the direction of the average velocity is not necessarily the direction of the object's motion. For example, if you are turning or going straight or whatever, then the direction that your front is facing at that moment is the direction of your instantaneous velocity, and of course, it is the direction of your movement at that time. Average speed, let's say you make a lot of turns to reach a place, and the average speed has only one direction.

And you make so many turns, the direction of movement is different between the bends and the bends.

1. Let's talk about the textbook first, the speed of junior high school is the distance divided by the time; High school is a bit removed with time. High school emphasizes that velocity is a vector, and in addition to size, there is also direction. This direction coincides with the direction of displacement.

2. Several concepts:

Velocity: The ratio of the displacement of an object to the time it takes for that displacement to occur. Vector average velocity:

The ratio of the displacement of an object in variable speed motion to the time it takes for that displacement to occur. Vector instantaneous velocity: The velocity of an object at a certain moment or position.

Vector Rate: The magnitude of the instantaneous velocity is called the instantaneous velocity, or velocity for short. Scalar average rate:

The ratio of the distance traveled by an object to the amount of time. Scalar From the above concept, it is not difficult to see that in fact, the speed of junior high school is more accurately called the average rate, and the big concept of speed should be placed in the general position first. The so-called average velocity and instantaneous velocity are just the following two cases.

The instantaneous speed is special in the time interval is 0, at this time we don't call it time, it is called time. He describes the motion of objects most precisely.

There is no "average" in front of it, it refers to the instantaneous, you see.

If you have an average, you don't need to think about the process, you just need to think about the beginning and end states.

The object has acceleration – indicating a change in the velocity of the object – indicating a change in the magnitude or direction of the velocity, at least one of the magnitude and direction of the velocity.

b - curvilinear motion with constant velocity magnitude, such as uniform circular motion c - curvilinear motion with variable velocity, such as flat throwing motion.

d - variable speed linear motion, such as uniform variable speed linear motion.

Example: b Uniform circular motion.

c Parabolic motion.

d Uniform variable speed linear motion.

A few things to keep in mind:

In the V-T diagram.

1.The velocity is positive above the transverse axis (t-axis) and negative below;

2.The acceleration of the same straight line is in the same magnitude direction;

3.The slope of a straight line is the acceleration (including the magnitude direction);

4.The area enclosed by the image and the horizontal axis represents the displacement, and the above of the horizontal axis is a positive displacement and the lower one is a negative displacement.

After remembering these points, it will be easy to solve these problems, now try to explain why C is not right, and add if you have any questions.

The velocity and acceleration in the third second are both negative and are in the same direction.

If the velocity of an object is negative and the velocity is increasing in the negative direction, then the acceleration direction is the same as the negative direction, that is, the same as the velocity direction.