Instantaneous velocity in physics, how is instantaneous velocity calculated in physics?

1.The direction of the instantaneous velocity at a certain moment (or through a certain position) is the direction in which the object is moving at that moment (or through a certain position). It is not necessarily the same as the only direction, for example, object A moves forward 10 meters in the first two seconds, and 5 meters backward in the third second (both moving in a straight line at a uniform speed).

Then the displacement direction is forward (the displacement distance is 5 meters). But if the direction of the instantaneous velocity in the third second is backward, and the direction of displacement is forward, it is different. So the direction of the instantaneous velocity is not the same as the direction of the displacement.

2.When something advances 5 meters and then retreats 5 meters, the displacement is 0, and the instantaneous velocity = displacement time, (not the distance time) so the instantaneous velocity is 0

1 The direction can be the same, and the objects will only have different directions if they are moving in a non-linear line! The displacement direction is the starting point to the end, and the instantaneous velocity direction is the velocity direction, which can be the same or different!

2 is that an object is relatively stationary for a certain period of time!

To add the first floor answer, it is also possible to be true when the motion is a straight line but there is a reverse in the process, which is 1.

1. There is a mistake on the 1st floor, and the two directions are different when the object moves in a non-linear line or when the spring oscillator vibrates.

2, which means stillness. i.e. relatively stationary. There is no such thing as absolute static

Instantaneous velocity represents the velocity of an object at a certain moment or passing through a certain position, the ratio of the displacement in an infinitely short period of time adjacent to that moment to the time taken to pass through this displacement v= x t. Instantaneous velocity is a vector quantity that has both magnitude and direction. Instantaneous velocity is a quantity in an ideal state.

Chinese name instantaneous speed.

The foreign name is instantaneous velocity

The expression v=x t (t is infinitely close to 0).

Presented by Galileo.

Applied Disciplines. Physical Definition.

The velocity of a moving object at a certain time or position is called instantaneous velocity, which indicates the velocity of a moving object at a certain time or position, referred to as velocity. Instantaneous velocity is a vector, and the direction of the instantaneous velocity at a certain moment (or through a certain position) is the direction of the motion of the object at that moment (or through a position). If the object moves in a straight line at a uniform velocity, and its velocity remains the same during the motion, then its instantaneous velocity at any moment and the average velocity of the whole motion process are also the same.

Instantaneous velocity is a vector quantity, and in linear motion, the direction of instantaneous velocity is the same as the direction of motion of the object, and its magnitude is called instantaneous velocity. [1]

Finding the linear motion of a uniform variable velocity: the average velocity of an object in the time interval from t to t+ t is s t, and if t is infinitely close to 0, it can be assumed that s t represents the velocity of the object at time t. In a linear motion with uniform speed, the average velocity of a certain period of time is equal to the instantaneous velocity at the intermediate moment (i.e., the instantaneous velocity at the intermediate moment).

In a uniform linear motion, the intermediate displacement instantaneous velocity should be .

Normal Motion: Only estimates can be found. Extend to the left and right sides for a period of time x t tending to 0.

Constant velocity: The average velocity is the instantaneous velocity. The speed of a uniform linear motion is the average velocity.

Instantaneous velocity is referred to as velocity (usually referred to as average velocity), but when the word "speed" is encountered in problem solving and academics, it refers to instantaneous velocity unless otherwise specified. Theoretically, the instantaneous velocity is only an estimate, and the exact calculated time should be infinitely close to 0, but not 0.

Direction: The direction of the instantaneous velocity, i.e., the tangential direction in which the point moves on the trajectory.

Instantaneous velocity and average velocity: In linear motion with uniform velocity, the average velocity of the motion of the object is equal to the instantaneous velocity at intermediate moments.

Instantaneous rate and instantaneous velocity:

Instantaneous velocity is a vector quantity that has both magnitude and direction.

Whereas, the instantaneous rate is a scalar quantity, only the magnitude has no direction;

The magnitude of the instantaneous velocity is the instantaneous rate. [1]

Error correction references.

1] richard p. f

When calculating instantaneous velocity, all that you learn in the first year of high school is a rough calculation. The formula is the total bit removal time taken (v=x t). You can write it down by analogy with v=s t in junior high school.

For example, at the end of the 2s, this moment. Subtract the displacement at the end of the 1st second from the displacement at the end of the 3rd second, which is the total displacement. Divide by 2s to find the instantaneous velocity at the end of the 2nd second.

The velocity of the physical instantaneous stop is as follows:

1. If it is a uniform linear motion, v=s t.

2. If it is a linear motion with uniform variable speed, the acceleration a is constant, vt=v0+at. The average speed of the stove over a period of time is the instantaneous speed in between. vt^2-v0^2=2as。

3. If it is a uniform speed curve motion, such as a flat throwing motion, the acceleration g is constant, vt 2=v0 2+(gt) 2.

4. If it is a uniform circular motion, v = circumference period.

5. If it is a variable speed movement, it can be considered that the average speed of a short period of time is the instantaneous speed at a certain time. For example, the instantaneous velocity displayed by a car instrument is calculated using this principle.

To understand instantaneous velocity, we must first figure out the meaning of average velocity. For a moving object, the average velocity of the whole process can be found equal to the ratio of the total displacement of the whole process to the total time; You can also choose one of the sections arbitrarily and find the average velocity of this section, which is equal to the ratio of the displacement to time of this section.

Notes:

In variable speed movements, the speed changes all the time, but the shorter the time period chosen, the smaller the speed change. If you want to find the instantaneous velocity of an object moving to a certain point, you can find the average velocity of the object after reaching this point, of course, this is biased because the velocity of the object changes later.

If you select the average velocity within the selection, the deviation still exists, but is smaller than when you select. The shorter the time period chosen, the closer the average velocity is to this instantaneous velocity. When the selected time period is infinitely close to 0, the average velocity obtained is equal to the instantaneous travel time velocity at this point.

Question 1: The Physical Meaning of Instantaneous Rate The physical meaning of instantaneous rate: The magnitude of the velocity of an object at a certain moment and a certain time.

Instantaneous rate: In order to accurately describe the speed of the object's motion, take a very short period of time δt, if δt is very, very small, it can be considered that δx δ t (displacement ratio time) represents the velocity of the object at time t, and this velocity is the instantaneous velocity. Instantaneous velocity is a vector quantity, which is the ratio of displacement to time, and has a direction (the direction of the object's motion), and the magnitude of the instantaneous velocity is the velocity, which can also be called the instantaneous velocity.

Question 2: Meaning of instantaneous velocity The meaning of instantaneous velocity.

Instantaneous velocity indicates the velocity of an object at a given moment, the ratio of the displacement at that moment to the time taken to pass through that displacement.

The average velocity of an object in the time interval from t to t+ t is x t, and if t is very small, it can be considered that x t represents the velocity of the object at time t.

Question 3: What is the physical meaning of the magnitude and direction of velocity? Generally speaking, the greater the velocity, the faster the object is moving, and vice versa, the slower. And because the modal velocity is a vector, it has its directionality, and the negative sign indicates that it is opposite to the direction of the initial velocity

Categories: Education, Science, >> Learning Aid.

Problem description: Or is the speed average.

Parse the remaining missing codes:

Velocity. A physical quantity that represents the direction of motion of an object and how fast or slow it is moving. In uniform linear motion, the velocity is numerically equal to the distance traveled per unit of time.

It can be defined as: the amount of change in the disguise and concealment of the moving animal ** per unit of time.

Velocity is a vector, there is a size, and there is also a direction.

The unit of velocity is the composite unit of the unit of length and the unit of time, which in the International System of Units is: meter second (m s).

There are also centimeter seconds (cm s) and kilometers and hours (km h).

Calculation formula: v=s t v is the velocity s s is the displacement and t is the time taken to pass the displacement.

Addendum: The term "velocity" is a physical quantity that describes the speed of change in the direction and position of an object's motion, and velocity can only describe the motion state of the object and nothing else.

The velocity of the object at a certain moment v=s t (t is infinitely close to zero).

This is a uniform deceleration motion.

The acceleration a=(δx) t =(7m-9m) (1s) =2m can be obtained

The average speed of the whole process v=s t=(9+7+5+3+1)m 5s=5m sBecause it is a slow motion of uniform and decreasing calendar, the average speed of the whole process is equal to the instantaneous speed of the intermediate time (instant), that is, only the instantaneous speed is 5m s.

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