What is Newton s second law? What is Newton s second law?

Newton's second law.

1.Changes in motor status:

A change in motion is essentially a change in velocity, and it includes two cases: It is the magnitude of the velocity.

A change is a change in the direction of movement.

2.Newton's Second Law:

The acceleration of an object is directly proportional to the resultant force of the external force and inversely proportional to the mass of the object, the direction of acceleration.

It is the same as the direction of the resultant external force.

Formula: f-mas

Force is what changes the state of motion of an object. Because there is force that produces acceleration.

The rule of 1n: The force that causes an object with a mass of 1 kg to produce an acceleration of 1m s2 is 1n.

1n=1kg·m/s2

Before Newton's unit was defined, Newton's second law was expressed as f=kma) Acceleration is a vector quantity, and its direction is the same as that of the resultant external force.

3.Equilibrium state: The state in which the object is at rest or in a uniform linear motion is called the equilibrium state.

Equilibrium of forces: The object is in equilibrium under the action of several forces, then this situation is called the equilibrium of forces.

Analysis of key and difficult points].

The combined force is responsible for the occurrence of acceleration. Its magnitude is determined by the f and mass of the object m in Newton's second law, and f is the force on which the object is subjected, not a certain force. For example, "a thing."

The body is still on the level ground, and it is lifted vigorously, without lifting". The f in this example is just.

A pulling force, not a resultant force in Newton's laws. So the force f that is usually said is not the same as.

The resultant external force of the object.

The direction of acceleration is determined by the direction of the resultant external force. It sums up the same direction as the external force.

Newton's second law is the key to the problem of dynamics and must be taken seriously.

2.The relationship between the combined external force, acceleration and the velocity of the object:

When the direction of the resultant external force on the object is the same as the direction of motion of the object, the object moves at an accelerated pace.

When the resultant external force gradually decreases, the acceleration gradually decreases, but the velocity increases.

When the direction of the resultant external force on the object is opposite to the direction of the object's motion, the object moves with deceleration.

No matter how much the acceleration is, the velocity of the object always decreases.

3.Solution ideas:

To solve a problem using Newton's second law, you first need to draw a simple figure of an object.

Correctly analyze the forces on an object. (When there is a resultant force and a component force, the analysis of the resultant force does not analyze its division.)

force, the analysis of the molecule does not say its resultant force. For example, in the upper right diagram, the object is described as a "sliding force".

And "pressure" does not say "gravity", and "gravity" does not say "sliding force" and "pressure".

4.When the result of solving the problem is a negative value for drag or acceleration, be sure to pay attention to the direction when answering. Compare.

For example: a=-5m s2

You should answer: "The acceleration of the object is 5m s2, and the object is in a deceleration motion."

or in the opposite direction to the direction of motion of the object).

Newton's second law, also known as Newton's second law of motion, is a fundamental principle in classical mechanics. This law states that the acceleration of an object is proportional to the external force and decreases inversely as the mass increases. It can be expressed by the formula f=ma, where f denotes the magnitude and direction of the resultant force experienced by the object, m denotes the mass of the object, and a denotes the acceleration of the object.

This law is widely used in physics research and engineering practice in various fields, and is the most basic law of classical mechanics. This law has its applications in various fields such as engineering, mechanical engineering, physics, chemistry, biology, medicine, etc.

Newton's second law can also be expressed in terms of momentum, i.e., the rate of change of liquid skin applied to an object equal to the momentum. This is because momentum is equal to mass multiplied by acceleration, so if the mass is constant, the law of acceleration can be obtained; If the mass changes over time, then the system is a variable mass system and needs to be taken into account.

In conclusion, Newton's second law is a very basic and important law of physics, which describes the state of motion of an object under the action of an external force, and has a wide range of applications in various fields.

Newton's second law was invented by Isaac Newton.

In 1687 in Principles of Mathematics of Natural Philosophy

in the book. A common expression is: acceleration of an object.

The size 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.

The formula for Newton's second law is f=ma.

Newton's second law of motion.

There are five features:

Transientness: Newton's second law of motion is the instantaneous effect of force, where acceleration and force are generated, changed, and disappeared at the same time.

Vector: is a vector expression.

The direction of acceleration and resultant force is always the same.

Independence: The acceleration produced by an external force is only related to the external force, not the other forces, and the vector sum of the acceleration produced by each force is equal to the combined external force.

The resulting acceleration, the resultant acceleration is related to the resultant external force.

Causality: Force is the cause of acceleration, acceleration is the effect of force, so force is the cause of changing the state of motion of an object.

Equivalence is not equivalent: although , it is not a force, but reflects the change in the state of the object; Although , which is only a measure of the mass of an object, m has nothing to do with or .