The moon moves at a uniform speed, where is this sentence wrong

Very simple. You have to figure out what uniform velocity means?

Velocity contains velocity and direction and is a vector.

Constant velocity means that neither the velocity nor the direction changes.

The moon revolves around the Earth, but the rate and direction are changing. So wrong.

When an object is moving in a circle, the direction of velocity is the tangent direction between the position and the circle.

1. There must be a reference object to describe the motion, and there is no exact reference in the question, which is not enough to describe the motion of the object. We don't know whether we are looking at the speed of the moon as it rotates or the speed at which the moon orbits the earth; Without the motion of the reference object, there can be no talk of uniform speed. This is inherently wrong.

2. In addition, if there is a reference, uniform motion is not equal to uniform motion, velocity is a vector, to judge whether the motion of an object is uniform, it is necessary to consider whether the velocity and direction have changed.

The strict definition of uniform motion is a motion with constant velocity, including both magnitude and direction.

However, the moon, a celestial body, moves around the earth, and the speed and direction change from time to time, which cannot be called uniform motion. This statement is not only wrong, but also very wrong, if geophysicists think that there are celestial bodies moving at a uniform speed in the universe, the earth would have been finished long ago.

Done, thanks.

Uniform motion is a motion in which the direction and magnitude of velocity and acceleration are constant, while the moon is in a circle, at most it can be said to be a uniform circular motion, and the direction is changing, that is, there is a centripetal force, and the centripetal force is gravitational force.

The moon moves in a uniform circular motion around the earth, and the moon is provided by the gravitational force of the earth, and the moon is in variable speed motion, and the force received by the moon is impossible to balance.

First, of course not. In a circular motion, the resultant external force is not zero.

If the force of attraction of an object in a circular motion suddenly disappears, the motion state of the object will no longer change, that is, it should maintain the velocity and direction when the force just disappears, that is, fly out in the tangent direction at the moment when the gravitational force disappears, and move in a straight line at a uniform speed

Therefore, choose B

Note that the Moon does not move in a uniform circular motion around the Earth. It is elliptical in shape at its farthest distance from the Earth at 406,610 kilometers and its closest at 356,330 kilometers. According to Kepler's third law, it is faster when it is close to the Earth and slower when it is far away from the Earth.

No. Uniform circular motion, although the magnitude of the force does not change, the direction changes. Force is a vector quantity, and a change in the magnitude direction is not a constant force.

There are also those who don't understand to ask me, I wish you progress in your studies.

Maybe it's indifferent: it's all the moon's fault.

The full lyrics are as follows:

The wind and rain will not blow away.

You said you'd be waiting for me at the intersection.

The wind gently brushes your long hair.

I just want to anchor next to you.

When thoughts bloom in dreams.

The morning bell and the dusk drum are still singing the parting song.

Fireworks on the banks of the willows in the hazy moonlight.

After turning around, we were already passers-by.

Cut the constant love and hate all by you.

I will give up the world for you.

Thousands of miles of rivers and mountains have faded for you.

The years have engraved you in my life.

It's all the moon's fault.

I'm willing to be lonely for you for the rest of my life.

Cause and effect that cannot be escaped are like moths to a fire.

We have loved and hated, and we have walked hand in hand.

It's all the moon's fault.

I'm willing to spend my life for you.

The unbreakable shackles drowned in a dream.

The peach blossoms are falling, and there is someone waiting for me in front of me.

Cut the constant love and hate sorrow by you.

I will give up the world for you.

Thousands of miles of rivers and mountains have faded for you.

The years have engraved you in my life.

It's all the moon's fault.

I'm willing to be lonely for you for the rest of my life.

Cause and effect that cannot be escaped are like moths to a fire.

We have loved and hated, and we have walked hand in hand.

It's all the moon's fault.

I'm willing to spend my life for you.

The unbreakable shackles drowned in a dream.

The peach blossoms are falling, and there is someone waiting for me in front of me.

The unbreakable shackles drowned in a dream.

The peach blossoms are falling, and there is someone waiting for me in front of me.

Is it the moon that is to blame?

3 The state of motion of an object moving in a uniform circular motion changes all the time and in the same way.

The state of motion refers to the object'sSpeedsituation. Therefore, stationary or uniform linear motion is the state of motion that does not change.

Uniform circular motion can be thought of as follows: at a certain moment in motion, if there is no thin line, the object must move in a uniform straight line along the tangent (ignoring gravity). But the thin line is still there, and the thin line pulls it towards the side of the thin line.

At the next moment, the object has a tendency to move in a straight line at a uniform speed, but it is pulled by a thin line. That is to say, the object always has a tendency to move in a straight line at a uniform speed, but it is always pulled by the thin line to the side of the thin line, and its state of motion must change all the time.

Because the Moon also orbits the Earth and the Sun, the trajectory of a satellite that moves in a uniform circular motion relative to the Moon is not actually a circular trajectory.

There is a change in the direction of speed.

The hook means root number.

In this case, the centripetal force is equal to the gravitational force, and the equation cancels its own mass m.

gmm r 2=mv 2 r where g is the gravitational constant, m is the mass of the earth, m is the mass of the moon, r is the radius of the moon's uniform circular motion, v is the rate of the moon's uniform circular motion, and after the reduction is gm r under the root number

The fault is that the stars are twinkling, according to common sense, the starlight of the stars of the moon is too bright, and the phenomenon of the stars twinkling is rare.