Newton s first law reflects what remains the property of all objects

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 an 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, it has an 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 acted upon 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 objects.

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.

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.

All objects in the first law refer to macroscopic objects. Newton's first law is also known as the law of inertia and the law of inertia. A common full formulation is that any object must remain in a uniform linear motion or at rest until an external force forces it to change its state of motion.

Newton's first law gives the concept of an inertial frame, the first.

2. The third law and the system of particle mechanics established by Newton's laws of motion are only true for the inertial orange system. Therefore, Newton's first law is indispensable and is an important law of mechanics that is completely independent.

a. All objects have the property of keeping their original state of motion unchanged, so A is correct;

b. When the object is not affected by the force, it maintains a state of stationary or uniform linear motion, so B is correct;

c. The object is affected by the balance force, and the state of motion remains unchanged, so C is wrong;

d. Force is the reason for changing the state of motion of the object, and the change of the motion state of the object must be affected by the force, so d is correct

Therefore, C

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.

I am a fitness trainer and force is what changes the state of motion of an object.

Inertia is the reason for maintaining the vibrating motion of the object.

Two expressions of Newton's first law are incompatible:

1.All objects, when not subjected to force, always remain in a state of uniform linear motion or at rest, unless the force acting on it forces it to change this state of motion.

2.When a particle is far enough away from other particles, the particle moves in a straight line at a uniform speed or remains stationary.

Finally, I wish you a happy fitness, if you have any fitness questions, you can ask this coach to answer.

When all objects are not affected by external forces, they always remain at rest or in a state of uniform linear motion, which is Newton's first law, also known as the law of habitual care

Therefore, the answer is: all objects always remain at rest or in a state of uniform linear motion when they are not affected by the implicit simple force

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: it is not affected by external forces, and it moves in a straight line at a uniform speed

The content of Newton's first law is: all objects always remain at rest or in a state of uniform linear motion when they are not affected by external forces, and inertia is the property of objects that keep their original motion unchanged, so Newton's first law, also known as the law of inertia, is the answer is: rest; Uniform linear motion; Newton first; motor status; Inertia