What are Newton s laws of motion Newton s first, second, and third laws and their applications?

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Report. 1 Newton's First Law.

Contents: Any object remains at rest or in a uniform linear motion until it is forced to change this state by the forces of other objects.

Explanation: Objects have a tendency to maintain rest and move in a uniform linear line, so the motion state of the object is determined by its motion speed, and its motion state will not change without external force. This property of an object is called inertia.

So Newton's first law is also known as the law of inertia. The first law also clarifies the concept of force. It is clarified that force is the interaction between objects, and it is pointed out that it is force that changes the motion state of objects.

Because acceleration describes the change in the state of motion of an object, force is related to acceleration, not to velocity. If you don't pay attention to this in your daily life, you will often have a false impression.

Note: Newton's first law does not hold true in all frames of reference, in fact it only holds in inertial frames of reference. Therefore, Newton's first law is often used as a criterion for whether the frame of reference is an inertial frame of reference.

2 Newton's second law.

Contents: The object will produce acceleration under the action of the resultant external force, and the direction of acceleration is the same as the direction of the resultant external force, and the magnitude of the acceleration is proportional to the magnitude of the resultant external force and the inverse proportion of the inertial mass of the object.

The second law quantitatively describes the effect of the force acting on and quantitatively measures the magnitude of the inertia of an object. It is vector and is an instantaneous relation.

It should be emphasized that the combined external force on the object will produce acceleration, which may change the motion or velocity of the object, but this change is related to the motion state of the object itself.

In a vacuum, since there is no air resistance, various objects have the same acceleration regardless of their mass because they are only subjected to gravity. Therefore, in free fall, their velocity changes the same in the same time interval.

3 Newton's Third Law.

Contents: The action and reaction forces between two objects, on the same straight line, equal in magnitude and opposite in direction.

Note: To change the motion of an object, other objects must interact with it. The interaction between objects is manifested through force.

He also pointed out that the action of force is mutual, and there must be a reaction force. They act on the same straight line, equal in size and opposite in direction.

Also note:

1) There is no priority or priority between action and reaction forces. Creates and disappears at the same time.

2) This pair of forces acts on different objects and cannot be counteracted.

3) The action force and the reaction force must be forces of the same nature.

4) Nothing to do with the frame of reference.

Newton's three lawsNewton includes Newton's first law of motion, Newton's second law of motion, and Newton's third law of motion. I have compiled the relevant knowledge of Newton's three laws for you, let's learn about it.

Newton's first law of motion states that the velocity of an object does not change unless an external force is exerted. According to this law, assuming that no external force is applied or the sum of the applied external forces is zero, then the object in motion always remains in a state of uniform linear motion, and the object at rest always remains at rest. The property exhibited by an object that maintains a constant state of motion is called inertia.

Therefore, this law is also called the law of inertia.

The magnitude of the acceleration of the object is directly proportional to the force exerted on the object, inversely proportional to the mass of the object, and the direction of acceleration is the same as the direction of the combined external force. From the point of view of physics, Newton's second law of motion can also be expressed as "the rate of change of momentum of an object with time is proportional to the sum of the external forces subjected", that is, the first derivative of momentum to time is equal to the sum of external forces.

In classical mechanics, Newton's third law states that when two objects interact with each other, the forces exerted on each other are equal in magnitude and opposite directions. Newton's third law of motion and the first.

The first and second laws together constitute Newton's laws of motion, which expound the basic laws of motion in classical mechanics.

Newton's First Law.

All objects remain in a state of constant linear motion or at rest until an external force compels it to change this state.

Newton's second law.

The acceleration of an object is directly proportional to the resultant external force f experienced by the object, inversely proportional to the mass of the object, and the direction of acceleration is the same as the direction of the applied force.

The third law of the ox rising and slowing down the lead.

The action and reaction forces between two objects, on the same straight line, are equal in magnitude and opposite in direction.

Time = distance speed.

Speed = distance time.

Distance = speed time.

Scientifically it is used to express how fast or slow an object is moving. The speed is numerically equal to the distance traveled per unit of time. The formula for calculating velocity is: v=s t. The units of velocity are m s and km h.

The speed does not change to V', any distance is equal to a constant velocity v'Multiply the equilibrium time t.

When the velocity changes, although the equation does not hold, the proportional relationship will also be wrong, so Tan Qing does not consider the uneven properties of the speed change and the time change. The property of disequilibrium belongs to the problem of the relationship between units and patterns in its relativity, which can only be solved by constants.

Newton's First Law of Motion:

Any object must remain in a constant velocity-sensitive linear motion or at rest until an external force forces it to change its state of motion.

1. The inertial frame of reference is determined and the logical circular argument is derived, which is the manifestation of the axiomatic system, and the first proposition of any discipline must have this characteristic.

2. It points out that any object has inertia and establishes the concept of inertia.

3. Its negative proposition reveals the concept of force, which is the action of an object on an object, and the force causes the object to change its state of motion.

4. Newton's first law of motion is the basis of Newton's second law, firstly, Newton's first law prepares the concept of the second law (force, inertial mass, inertial frame) and qualitatively clarifies the relationship between force and motion; Secondly, the first law mainly states the state of motion of an object when it is not acted upon by an external force.

Not being acted upon by an external force and having a zero sum of the vectors of the external force on an object are not the same thing, so Newton's first law cannot be regarded as a special case of Newton's second law at f=0.

1.The first law of motion: all objects always maintain a uniform linear motion or a state of rest when they are not subjected to external forces, which is the law of inertia. It shows that all objects have inertia.

2.Newton's second law of motion: the acceleration of an object is directly proportional to the resultant external force on the object, inversely proportional to the mass of the object, and the direction of acceleration is the same as the direction of the resultant external force. That is, the formula.

3.Newton's third law of motion: the force of action and reaction between two objects, in the same straight line, is equal in magnitude and opposite in direction.

Introduction: Sir Isaac Newton, President of the Royal Society, a famous British physicist, an encyclopedic "all-rounder", author of "Mathematical Principles of Natural Philosophy" and "Optics". In his 1687 book The Laws of Nature, he described gravitation and the three laws of motion.

Expansion: In 1679, Newton returned to the study of mechanics: gravity and its effect on planetary orbits, Kepler's laws of planetary motion, and discussions on mechanics with Hooke and Framstide.

He attributed his work to the book "The Motion of Objects in Orbit", which contained the preliminary laws of motion that were later formulated in the Principia.

Character Evaluation: In his 1688 book "The Mathematical Principles of Natural Philosophy", he described gravitation and the three laws of motion. These descriptions laid the foundation for the scientific view of the physical world for the next three centuries and became the basis of modern engineering.

By demonstrating the consistency between Kepler's laws of planetary motion and his theory of gravity, he showed that the motion of terrestrial objects and celestial bodies obeys the same laws of nature.

1.The law of inertia.

2.The Law of Acceleration.

Correct Answer: The Law of Acceleration.

The common formulation of Newton's second law of motion is that the magnitude of the acceleration of an 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 force. This law was proposed by Isaac Niuglingbiton in 1687 in his book The Mathematical Principles of Natural Philosophy.

Also known as the law of acceleration.

1.The law of inertia: when an object is not affected by external forces, it always maintains a constant speed of linear motion or a static state. Genus.

2.Law of Acceleration: The acceleration of an object's motion is directly proportional to the resultant force of all the external forces acting on the object and inversely proportional to the mass of the object.

3.Law of Action and Reaction: The force and reaction between two objects always act in a straight line, equal in magnitude and opposite in opposite directions.

Differences: The first law only qualitatively discusses the properties of the object itself, the first law can be understood as the force is the reason for changing the state of motion of the object, the second law is a supplement to the first law, and discusses the relationship between the change of the motion state of the object and the force from a quantitative point of view, while the third law studies the law of motion of the mass system, which is generally the interaction between two objects.

Newton's first law: An object always maintains a uniform linear motion or a state of rest without external forces.

Newton's second law: The acceleration of an object is proportional to the resultant external force that is f=m*a

Newton's third law: The interaction force between two objects is always equal.