Is it possible to change the object in Newton s first law to matter?

No, objects are macrocosmic descriptions, and matter is onlookers.

The law of bull 1 is descriptive of macroscopics.

If the object of study is the trolley and the weight as a whole, then do not have the condition that "m is much less than the mass of the trolley m"; If the object of study is a trolley, the condition of "m is much less than the mass of the trolley". State stool.

The fixed pulley changes the direction of the pulling force, if only the force in the direction of the rope is considered, the frictional resistance is not counted, and the rope can be straightened equivalently; When the research object is selected as a whole, the whole is only subject to g (note that it is in the direction of the rope), then there is a=g (m+m); When the subject chooses a trolley, the trolley is only pulled by the rope.

In the case of a certain acceleration and mass, the magnitude of the acceleration of the object is proportional to the force, inversely proportional to the mass of the object, and proportional to the reciprocal of the mass of the object. The direction of acceleration is the same as that of the applied force.

Newton's first law: When all objects are not affected by external forces, they always remain at rest or move in a uniform linear motion Zen potato This is the famous Newton's first law, also called the law of inertia We call the property of objects inertia

Therefore, the answer is: unhindered force; Uniform linear motion; Rest; Inertia

Analysis: Fill in the blanks according to the content of Newton's first law Newton's first law: All objects always remain at rest or in a state of uniform linear motion when they are not subjected to external forces Therefore, the answer is:

Not affected by any external force, uniform linear motion, stationary Comments: Newton's first law points out the relationship between force and motion: force is the cause of changing the state of motion of an object, not the reason for maintaining the motion of an object; It is pointed out that all objects have inertia

The law of ternary equilibrium: The process by which two non-equilibrium states tend to equilibrium in a system is the process of ternary equilibrium.

1 Contents: All objects remain in a state of uniform linear motion or at rest unless a force acting on them compels it to change this state.

2 Significance: 1) Newton's first law states that the state of motion of an object when it is not subjected to an external force is a uniform linear motion or rest (so the force is not the cause of maintaining the motion of the object); Newton's first law states that the law of motion of an object when it is not acted upon by an external force describes only an ideal state, while in reality an object that is not affected by an external force does not exist, and when the object is subjected to zero combined external force, its effect is the same as when it is not acted upon by an external force. Therefore, we can understand "not subject to external force" as "the net external force is zero".

2) The first half of the law, "All objects always maintain a state of uniform linear motion or a state of rest", reveals an important property of objects - inertia, that is, the property of objects to maintain a state of uniform linear motion or a state of rest, Newton's first law states that all objects have inertia in any situation. Therefore, Newton's first law is also called the law of inertia.

3) The second half of the law, "unless the force acting on it forces it to change this state", is actually a definition of force, that is, the force is the cause of changing the state of motion of an object, not the cause of maintaining the motion of the object, which should be realistically understood.

Newton's first law reveals the relationship between force and motion, points out the effect of force, and clarifies the concept of inertia.

Newton's first law also qualitatively states the dynamic significance of force. Force is what changes the state of motion of an object, i.e., what changes the velocity. When the velocity of an object changes, there is acceleration.

Hence it can also be said that the force is what causes the acceleration of the object. It cannot be considered that force is the cause of maintaining the motion of an object (uniform linear motion), nor can it be considered that there is motion if there is force, and there is no motion without force, and it cannot be considered that the movement of an object in one direction must be affected by the force in that direction.

3 Scope of application:

Objects moving at low speeds in the macroscopic world are only suitable in inertial frames of reference.

Knowledge expansion: changes in the state of motion of an object.

The motion state of the object, that is, the speed of the object's motion and the direction of motion, is described by speed, so the change of the object's motion state has the following three situations:

1) The direction of velocity does not change, only the magnitude changes;

2) The magnitude of the velocity does not change, only the direction changes;

3) The speed changes in magnitude and direction.

A Question Analysis: Newton's first law states that all objects always remain at rest or move in a straight line at a uniform speed when they are not acted upon by external forces. That is, when there is no external force, the original stationary still maintains the original motion, and the original motion still maintains the original velocity uniform linear motion, and this property of keeping the original motion unchanged is inertia, a pair.

The magnitude of inertia is related to the mass, and it has nothing to do with the velocity, and it takes a long time for an object with a high velocity to stop because of its large amount of velocity change and has nothing to do with inertia, b is wrong. If it is not subjected to force, it will maintain its original state of motion, that is, the force is the reason for changing the state of motion of the object, not the reason for maintaining the state of motion, and the answer C is false. Do the particle of curvilinear motion, if all the external forces are removed, the speed of the moment before the force is withdrawn will be maintained to do uniform linear motion, it cannot be a curve, the speed of the curve movement is changing, there is acceleration and resultant force The answer d is wrong.

Newton's first law reveals that all objects have the property of keeping their original state of motion unchanged, that is, all objects have inertia. At the same time, Newton's first law also qualitatively points out the dynamic significance of force: force is the cause of changing the state of motion of an object.

Maintain a constant linear motion or stationary.

Albert Einstein not only questioned Newton, but also proposed that the theory of relativity improved Newtonian mechanics. Newton's laws can be said to be an approximation of the theory of relativity at low speeds.

In addition, although Planck's quantum mechanics does not directly question Newton's theory, the "uncertainty principle" in quantum mechanics challenges Newton's theory that "as long as there are sufficient known conditions, the state of motion at any moment in the future" is challenged.

Galileo's research and scientific imagination.

The same trolley slides down from a standstill starting from the same position on the same inclined plane (this is to ensure that the trolley has the same speed every time it reaches the horizontal plane, pay attention to ensure a single variable). For the first time, a towel was laid on the horizontal plane, and the trolley slid on the towel for a short distance before stopping (as shown in Figure A); the second time, a smoother cotton cloth is spread on the horizontal surface, and the trolley glides on the cotton cloth for a longer distance (as shown in Figure B); The third time is a smooth plank, and the car glides the farthest distance (Figure C). Galileo believed that it was the resistance of the plane to the trolley that caused the trolley to stop, and the smoother the plane, the farther the trolley would slide.

Shows that the lower the resistance, the farther the trolley will slide Galileo scientifically imagined that if a very smooth plane could be found with zero resistance, the trolley would not slow down and would continue to travel at a constant speed.

Descartes' addition.

Descartes et al. conducted a more in-depth study on the basis of Galileo's research, and he believed that if the moving object is not affected by any force, not only the velocity will not change, but also the direction of motion will not change, and it will move at a uniform speed in the original direction.

Newton's great contributions.

Newton, the great British scientist, summarized the research results of Galileo and others; Thus an important law of physics is summarized: all objects always remain at rest or in a state of uniform linear motion when they are not subjected to force. This is Newton's first law.

Let's experiment! Make the contact surface as smooth as possible, and find that it can move indefinitely.

After a lot of experiments, it was deduced.

In the textbook, it is said in the full-time ordinary senior high school textbook (compulsory) Volume 1 (Renjiao Edition) p.

In reality, it is Brother Dun in the process of unremitting efforts and others to work together, keep improving and improving, through his own two treasures (hands and brains) to get it...

It's all made up by the supervisor. There are simply not so many legends in history. Many of them were written by later generations to add color. For example, Zhuge Liang, Newton, Washington, Edison...