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How to change physical st to vt
College knowledge, high school may not need to be able to solve problems, as long as the st derivative, you can
We all know that v = s / T, then in an infinitesimal period of time after the current time, the instantaneous speed at the current time = the increment of S / the infinitesimal period of time
This is exactly the definition of derivative. It may be a bit confusing. Let me give you an example
For example, in the case of uniform linear motion, the st graph is a straight line with a slope of 2 passing through point O (the units of the st graph are in international units), then the VT graph is a straight line with v = 2
For St graph, the result of derivation is also v = 2 (st graph represents s = 2T, take t as an independent variable, and obtain DS / dt = 2, i.e. v = 2)
Let's take another example. For a uniformly accelerating linear motion, if the st graph is a parabola passing through point O and the function is s = 0.5 * 5T & sup2;, then the VT graph is v = 5T
Similarly, the derivative of S = 0.5 * 5T & sup2; is DS / dt = 5T
The derivation formula used above is as follows:
Y = ax, then y '= a
Y = x ^ B, then y '= BX ^ (B-1)
There are also some other common ones, which are not listed here
If there is anything unclear, welcome hi
Calculate acceleration according to vt diagram
Give you a dot timer paper bag to measure a group of data. If you want to calculate acceleration according to the data, how can it be accurate? If you want to draw VT diagram first, what's the difference?
1. After a group of data is measured by the clock, the acceleration can be calculated according to the following formula, which can reduce the error and make it more accurate (the formula is shown in the figure below), In this way, another method can be used to solve the problem: the slope of the V-T diagram of x0d (1) is equal to the acceleration; and the definition formula of acceleration (the formula is shown in the figure below) is used
How to see the speed in St image? How to see the acceleration in VT image,
If it's all a slanting straight line, then the slope is equivalent to the function image y = KX in mathematics
How to see the direction of acceleration and velocity in a VT image
Acceleration direction is slope, positive slope, positive acceleration direction; negative slope, negative acceleration direction
Looking at the position of the line in the speed direction, the line is on the x-axis, the speed is in the positive direction, the line is under the x-axis, and the speed is in the negative direction
Physical displacement time image in grade one of senior high school
X = v0t + 1 / 2at ^ 2 we study linear motion. Why is the x-t image not a straight line?
The x-t image represents how the displacement changes with time, rather than its trajectory. In addition, if the x-t image with uniform velocity is a straight line, then the slope X / T = V is a fixed value. In fact, the acceleration of the linear motion with uniform velocity is constant, and the velocity is uniform, so it is not a straight line
In the displacement time graph, why does the intersection of two straight lines indicate that the two objects must intersect? I think it can only indicate that the displacement is the same size, but it can't indicate the direction
Displacement refers to the intersection of the directed line segments from the end position to the exit position in the displacement time image, which means that the distance from the end position to the exit position is equal, that is, they meet. The motion direction is the size of the slope of the straight line. The same positive or negative slope means that the motion direction of the two objects is the same, and the opposite slope means that the motion direction of the two objects is opposite, The distance between the two objects and the exit position is the same, so there is no need to consider the direction of motion
For the first unit of physics in grade one of senior high school, (displacement time diagram) and (velocity time diagram)
Why is drawing a straight line a straight line movement, and why is it a "straight line"?
Why is "curve" also a linear motion?
-Speed has size and direction. The direction in the coordinate system is the same, so drawing a straight line is a straight line motion. Similarly, any line in the coordinate system is a straight line motion, such as a curve
Speed represents the speed of an object's telecontrol, and each physical quantity represents a concept
I can't understand doing work
What is the difference between 1500j and 1000j/
W = FS, what does work mean?
In fact, it doesn't need specific understanding! It's just a formula of definition. Just remember it. In fact, the definition from the beginning is a macro assumption, such as: what is force? No one can say what is force. It's just that the assumption conforms to the general objective law and is accepted by everyone
Speed is a physical quantity that describes the relationship between distance and time. Is that right?
No, the velocity is vector, it has direction, the distance is scalar, it has no direction
Speed is to describe the size of the object is equal to the distance through, in the international system of units, the unit of speed is
In the international system of units, the unit of speed is m / s
RELATED INFORMATIONS
- 1. Speed is an object_____ A physical quantity, which is numerically equal to the position of the object_____ .
- 2. Specific physical meaning
- 3. Is the speed of sound in the air average or instantaneous? Is the speed from Shanghai to Suzhou average or instantaneous?
- 4. In senior high school physics compulsory one, there is an experiment of uniform linear motion, which requires the instantaneous velocity of a point on the paper tape. I know it needs to be estimated when measuring the displacement. But what about the velocity obtained by dividing the displacement by time? What about the acceleration? If the difference between the two displacements is just an integer? Do you want to add. 000 after the velocity
- 5. The formula of velocity is v = △ X / △ T. is v the average velocity or the velocity? What's the difference between the average velocity and the velocity
- 6. What's the image of uniform velocity linear motion
- 7. The solution of physical velocity in the first grade of high school After the train starts, it leaves the station for a uniform acceleration and straight-line movement. When people at the front end of the first carriage see the second carriage passing him for 5 seconds, how long does the sixth carriage pass him? Detailed process... First floor 1: √ 2-1: √ 3 - √ 2: Where did you come from? Can you explain it in detail
- 8. What is the difference between instantaneous velocity and average velocity
- 9. In high school physics, the average speed is the displacement divided by time. Then, there are several time periods in the whole process where the displacement is different from the time used. At this time, what is the average speed of the whole process,
- 10. What do the English letters K, l, h and N on the architectural drawings mean?
- 11. A and B are moving on the same straight line, and their V-T images are shown in a and B respectively A. They move in the same direction. B. they move in the opposite direction. C. they accelerate in the same direction. D. they accelerate in the opposite direction
- 12. A student's climbing speed is 1 m / s and the downhill speed is 3 / s
- 13. Isn't instantaneous velocity just velocity? Why is instantaneous velocity a vector and velocity a scalar?
- 14. What is the difference between average speed and instantaneous speed
- 15. When a particle moves in a circle and its normal acceleration a and tangential acceleration B are equal, the relationship between its angular acceleration a and angular velocity W is () A.w=a^2 B.w=2a^2 C.a=w^2 D.a=2w^2
- 16. On the earth, object a near the equator and object B near Beijing make circular motion at a constant speed with the rotation of the earth A. The centripetal forces of object a and object B point to the earth's center B. the linear velocity of object a is less than that of object B. C. the angular velocity of object a is less than that of object B. D. the centripetal acceleration of object a is greater than that of object B
- 17. Know the linear velocity, how to find the centripetal acceleration
- 18. Are the centripetal forces of satellites and objects on the Earth provided by gravity? If not, what's the difference
- 19. Like the faucet, the wheel and shaft are fixed together to rotate the machine, called ()
- 20. As shown in the figure, a disk rotates uniformly in the horizontal plane, and the angular velocity is 4rad / s. there is a small object with a mass of 0.10kg on the disk 0.1M away from the center of the disk, which can move with the disk, as shown in the figure. Then the centripetal force of the object in uniform circular motion is as follows______ N. As for the centripetal force of an object, Party A and Party B have different opinions: Party A thinks that the centripetal force is equal to the static friction of the disk against the object, pointing to the center of the circle; Party B thinks that the object has a tendency to move forward, and the direction of static friction is opposite to that of relative motion, that is, backward, rather than perpendicular to the direction of motion, so the centripetal force cannot be static friction. Do you agree______ I'll give you my opinion