In life, we see many objects moving. How do they move?

In life, we see many objects moving. How do they move?

The definition of each subject is different, some are divided into straight line, curve and vibration
The conditions are different
Straight line: the speed and the external force are in the same straight line
Curve: speed and external force are not in the same line
Vibration: the external force is the restoring force
There are mechanical motion, light motion, sound motion, thermal motion and electrical motion!
There are also translation, rotation and vibration!
To be exact, the motion of matter includes mechanical motion, thermal motion, electromagnetic motion, atomic motion and chemical motion, among which mechanical motion is the most basic form. The mechanical motion of matter refers to the position change of matter in time and space, including movement, rotation, flow, deformation, vibration, fluctuation, diffusion, etc, In other words, motion is relative, there is no absolute static, relatively speaking, in addition to the commonly said object in motion, it is relatively static

A problem of filling in the blanks in Mathematics
If the number of a is two times more than that of B, then the number of a is equal to that of B______ Times

If B is not equal to 0, the answer is three times,
Let B be x, then a be x + 2x = 3x
Then a / b = 3x / X
So a is three times as big as B,
If B is equal to 0, a is n times of B

Which objects are moving in life

The motion of objects is relative, not absolute
So whether any object in life moves or not depends on the reference object you choose
It can't be generalized

A problem of filling in the blanks in Mathematics
The sum of the distances from the moving point P to the line y = - 1 and the point F (0,1) is the fixed value 4. What is the value range of PF
I think it's [1,3], but the answer is [1,4]

There's a formula

Is there only translational motion in helicopter flight

No, the helicopter can do three degrees of freedom around the horizontal axis, vertical axis and vertical axis. Specifically, it can move forward and backward, fly left and right, head up and head down, and tilt left and right

Elementary 2 mathematics 1 yuan 2 times
Given that the nonzero real number m is a root of the equation x ^ 2 + NX + M = 0, then M + n=

Because the nonzero real number m is a root of the equation x ^ 2 + NX + M = 0,
So M & sup2; + Mn + M = 0
Divide both sides by M
Then M + N + 1 = 0
So m + n = - 1

True or false: the motion of a car on a slope is translation ()

Wrong. In physics, translation should refer to the horizontal movement of an object. (of course, in mathematics, translation is as described above), but it should be a physical problem

It is known that a, B and C are the three sides of triangle ABC, which is the case of judging the root of the quadratic equation of one variable a square x square + (a square + b square - C Square) x + b square about X!
A square x square + (a square + b square - C Square) x + b square = 0

The discriminant of the equation △ = (a square + b square - C Square) square - 4 × a square × b square = (a square + 2Ab + b square - C Square) (a square - 2Ab + b square - C Square) = [(a + b) square - C square] [(a-b) square - C square] = (a + B + C) (a-b-c) (a-b-c) (a-b-c) a, B, C are all positive, and the sum of the two sides of the triangle is greater than the sum of the two sides of the triangle

As follows
1. The counting units of 4.3 and 4.30 are the same
2. When the number of the whole class is fixed, the number of attendance is inversely proportional to the number of absence
3. An integer omitting the mantissa after "10000" is about 200000, and the maximum number is 199999
4. If a and B are two different prime numbers, then a / B must be the simplest fraction
As above, judge and explain the reason

1. The unit of 4.3 and 4.30 is the same. (wrong) the unit of 4.3 is 0.1, the unit of 4.30 is 0.012, the number of the whole class is fixed, the number of attendance is inversely proportional to the number of absentees. (wrong), the number of attendance + absentees = the total number of 3, an integer omitting the mantissa after "10000" is about 200000, this number is the most

A mathematical quadratic problem with one variable
An isosceles trapezoid canal has a cross-sectional area of 1.53 square meters. The width of the upper entrance is 1.4 meters more than the width of the canal, and the depth of the canal is 0.1 meters less than the width of the canal bottom. How many meters is the depth of the canal?

The depth of the canal is x m, the width of the canal is (x + 0.1) m and the upper entrance is (x + 0.1 + 1.4) M
〔（X+0.1）+（X+0.1+1.4）〕*X/2=1.53
X=0.9
The depth of the canal is 0.9m