From stationary to transported, whether the inertia changes 10

No, inertia is only about mass, not about speed. You may be wondering why the faster the object, the harder it is for me to stop. It's normal for ok to have this question, because that's what I used to think.

So let's discuss what "inertia" is below. First of all, the embodiment of inertia is that the object seems to retain its original state of motion, such as stationary, you want it to move, you push it and he will resist giving you the power of your hand; Moving object, you want to make him still, you have to push him hard. But you have to understand what is the metric of movement, and that indicator is speed.

What does that mean? For example, two objects A and B; If you want them to accelerate from 0 to 4m s, if a = 4 kg, b = 2 kg, then the force you use is 4n, then, a object should use 4s, b object only use 2s, it can be seen that the greater the mass of changing the same motion state, the more difficult it is to change. You might take two objects of the same mass, A is 4m s, B is 8m s, and let them rest at rest in ratio?

Stop, you have to understand, this comparison is no longer fair, A to rest is less than 4m s of speed, B to rest is less than 8m s, how can this work? If you want to make B to 4m s, so the same time is still the same. So inertia is the degree of difficulty in changing the size of a certain motion of an object, which means that you have to give the same amount of change, which cannot be unfair!

If you want to reduce it, you need to reduce it by 4 ms, or you can accelerate it by 4 ms. Because the greater the mass, the more difficult it is to change (f=ma, a is the variable velocity - that is, the speed that changes per second). Remember!

Inertia cannot be measured in terms of "the ease with which an object can move from its original motion to rest", it must be measured by the same variable velocity.

Nothing has changed. All objects have inertia because all objects have mass, and the magnitude of mass is related to inertia.

The magnitude of inertia is only related to mass, not to velocity.

Inertia is an inherent property of all objects, and inertia exists objectively and has nothing to do with the motion state of the object, whether it is subjected to force or not.

Inertia is a property that is immutable when an object is in a particular environment.

The train changes from stationary to moving, and the speed gradually increases, which is due to the effect of Hongnai traction;

The car is originally moving, after turning off the engine, the car still maintains the original state of motion due to inertia, but it will be affected by friction and resistance in the process of blind movement, so it will eventually stop grinding the skin

So the answer is: traction; Inertia

If you take a moving train as a reference, the position of the tree silver skin relative to the train changes, so the tree is in motion

The magnitude of kinetic energy is related to mass and speed, the speed of the train is getting slower and slower when it enters the station, the mass remains the same, and the speed decreases, so the kinetic energy decreases

The large object of inertia is absolutely small and related to the mass, not the speed, the mass of the train does not change, so the inertia does not change, so the answer is: motion; Becomes smaller; No change

I thought that the correct answer should be B, A and C are wrong.

The analysis is as follows: a When a stationary train starts, the slow change of speed is because the inertia of the train is large when it is stationary, and this sentence is wrong because the inertia is large when the train is stationary, in fact, whether the train is stationary or in motion, there is inertia, inertia is an inherent property of the object itself, and the magnitude of inertia is determined by the mass of the object, and has nothing to do with the state of rest or motion.

c. Someone can't push the originally stationary box because the magnitude of the external force does not exceed the maximum static friction on the ground, not because the inertia of the box is too large.

B is right.

a, the inertia of an object is related to its mass, not its velocity. The mass does not change, regardless of the speed, the inertia does not change anywhere.

c The reason why the push cannot move is because the friction is too great, and it has nothing to do with inertia.

Inertia is a property peculiar to matter and has nothing to do with motion and rest, and A is wrong to say that trains have a large inertia at rest. And the immobility of the C box is more a matter of friction, so it is wrong. So I choose B.

In fact, in multiple-choice questions, there are usually many options that seem to be correct, and the facts are correct, but we have to find the one that best fits the question, namely. It's like the landlord you're looking for an answer to this question.

1) Taking the passengers as a reference, when the subway train starts, the position between the Jineshino Railway train and the passengers does not change, so it is stationary;

2) In the process of train acceleration, the mass remains unchanged and the speed increases, so the kinetic energy of the train increases;

3) During the acceleration of the train, its mass no longer changes, only the speed changes, and the inertia of the train does not change

Therefore, the answer is: static; Enlarge; No change

B The mass of the object is a measure of the size of the inertia of the object, the inertia of the object is the inherent property of the object, which is only related to the mass, and has nothing to do with the state of motion of the object.

The inertia of the object is only related to the mass of the object, and has nothing to do with the speed of the object, so when the train slows down and enters the station, the mass of the train does not stare at the loss, and the inertia remains unchanged

So the answer is: unchanged Kaishen.

a. The inertia of the object is related to the mass of the object, the greater the mass, the greater the inertia, which has nothing to do with the motion state of the object, so A is wrong;

b. All objects have inertia at all times, so B is wrong;

c. The fighter throws away the auxiliary fuel tank before the battle, reduces the mass, and thus reduces the inertia, so C is correct;

d. The inertia of the object has nothing to do with whether the object is subjected to force and the motion state of the object, but only related to the mass of the object, so D is wrong

Therefore, c

1.The physical quantity that describes inertia is mass. Do you think the quality will change?

2.The blocking force will be reduced due to wear, because the relative sliding under high temperature + strong pressure caused by friction will gradually smooth the contact surface.

3.Nonsense. 4.Ibid. 5Yes.