If the acceleration of an object changes, does the state of motion necessarily change?

Not necessarily, when the car slowly applies the brakes, the acceleration is constantly changing, and the state of motion is not constantly changing.

a. Velocity is a vector, there is a magnitude and a direction, and the velocity does not change, so a is wrong;

b. According to the definition of acceleration, if the velocity remains constant, the change in velocity v=0, so its acceleration is also 0, and there is no change in acceleration, so b is wrong;

c. When the object moves at a uniform variable speed, the acceleration is constant and the velocity changes uniformly, so C is correct;

d. If the velocity remains the same, the velocity remains the same, and the acceleration is 0, so d is wrong

Because acceleration is a vector quantity, i.e., a physical quantity with direction.

Acceleration includes magnitude and direction.

A change in the direction of the object's motion indicates a change in velocity.

And the change in velocity will have an acceleration.

So no matter what topic you encounter in the future.

As long as the velocity of an object changes (including a change in the magnitude of the velocity and a change in direction), there must be an acceleration.

1. The change of speed is divided into size and direction, if only the direction is changed, the size is unchanged, the kinetic energy is unchanged, for example: uniform circumference.

2. The mass of the aircraft that throws matter downward in the air is decreasing, and changing the speed of the aircraft at this time may also keep the kinetic energy of the aircraft constant.

From w=1 2mv*v, it can be seen that kinetic energy is related to both mass and velocity.

Let me explain each option, C is correct and late.

a, the direction of momentum of the object is the direction of velocity, not the direction of the resultant force, which is the direction of acceleration.

b, momentum is mv, so it is only related to the velocity and mass of the object.

c, for the same object is true, the greater the resultant force, the greater the acceleration, the faster the velocity changes, the mass is fixed, so the faster the momentum changes, the stem should mean that for one object, and not to compare 2 objects, so this option is right.

d, the change of momentum means the change of velocity, the velocity of the addition and annihilation of the impermeable velocity does not have to change, as long as the acceleration of the object is not zero, its velocity ridge must change, and the momentum must change, so this is wrong.

The internal energy is independent of the speed at which the object is moving.

There are three factors that affect internal energy:

1.The average kinetic energy of the particle.

2.The average potential energy of the particle. Search.

3.The number of particles.

The object is composed of multiple particles that are invisible to the naked eye, and the above three points are the factors that affect the internal energy.

Finally, you have to understand a concept:The velocity of the slag punch is independent of the velocity of the object

First of all, I would like to say to the questioner, why do you say "When the state of motion of an object changes, the velocity changes." "That's right.

We can decompose the factors that affect the state of motion of an object, the force.

The force is the reason for changing the state of motion of the object, i.e., the velocity is changed.

And velocity is a vector, there is a direction and a magnitude, the direction and the magnitude, any one changes, the definition of velocity changes, and the direction changes the velocity magnitude is a negative value!

So if the speed changes, the direction changes, the speed changes, the speed changes, there is a return to the original question, that is, the state of motion changes, so your proposition is correct.

The state of motion is the velocity, or the velocity describes the state of motion. It's one thing in itself, and rightly so, of course.

Think about it: the state of motion of an object is nothing more than "multiple pieces?" In what direction? Isn't that speed!

Yes. The change in the velocity of the object means that the state of motion has changed, the resultant external force must not be 0, and the acceleration = the resultant external force The mass is not equal to 0

The greater the acceleration, the greater the change in acceleration (presumably velocity)?

Not necessarily, acceleration is defined as the amount of change in velocity per unit of time, which is how fast or slow the velocity changes. It has nothing to do with the amount of velocity change.