-
Anonymous users2024-02-06What is Newton's second law.
-
Anonymous users2024-02-05Newton's second law states that the acceleration of an object is directly proportional to the force applied and inversely proportional to the mass of the object.
a=f m, f is the force, m is the mass, and a is the acceleration.
-
Anonymous users2024-02-04Newton's second law.
-
Anonymous users2024-02-03Categories: Education Academic Exams >> Gaokao.
Analysis: Key Points of Knowledge].
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, if a=-5m s2, you should answer: "The acceleration of the object is 5m s2, and the object is moving in a deceleration motion."
or in the opposite direction to the direction of motion of the object).
-
Anonymous users2024-02-02Newton's second law states that the magnitude of an object's acceleration is proportional to the force at work, inversely proportional to the mass of the object, and proportional to the reciprocal of the mass of the object.
Newton's second law of motion states that the magnitude of the acceleration of an object is proportional to the applied force, inversely proportional to the mass of the object, and proportional to the reciprocal of the mass of the object, and the direction of acceleration is the same as the direction of the applied force.
This law was proposed by Isaac Newton in 1687 in his book The Mathematical Principles of Natural Philosophy.
The first and third laws together constitute Newton's laws of motion, which expound the basic laws of motion in classical mechanics.
Newton's original formulation published in the "Mathematical Principles of Natural Philosophy": the momentum of a point of mass is proportional to the external force on which the momentum changes with time under the action of an external force, and is in the same direction as the external force.
Law features:
Newton's second law of motion has five characteristics: transientness: Newton's second law of motion is the instantaneous effect of force, acceleration and force are generated, changed and disappeared at the same time.
Vector: is a vector expression, and the direction of acceleration and resultant force is always the same. Independence:
The object is acted on by several external forces, and the acceleration produced under the action of one external force is only related to this external force, independent of other forces, and the vector sum of the acceleration produced by each force is equal to the acceleration produced by the resultant external force, the resultant acceleration and 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, it is only a way to measure the mass of an object.
-
Anonymous users2024-02-01Newton's second law of motion.
Encyclopedia business card. Newton's Second Law of Motion1 The content of the law The acceleration of an object is proportional to the resultant external force f and inversely proportional to the mass of the object, and the direction of acceleration is the same as that of the resultant 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 to it". That is, the first derivative of momentum to time is equal to the sum of external forces.
Newton's second law states that at macroscopic low velocities, f a, f m, can be mathematically expressed as f=kma, where k is a constant. However, since the magnitude of the force of 1 unit was not specified at that time, k=1 is taken, and there is f=ma, which is the expression of Newton's second law that we are familiar with today.
Newton's full name was Isaac Newton.
Sir Isaac Newton, President of the Royal Society, a famous British physicist, an encyclopedic "all-rounder", the author of "Mathematical Principles of Natural Philosophy" and "Optics". >>>More
Non-Newtonian fluid, the term may sound like a very advanced feeling, but it is actually a substance that is very close to our lives. There are a lot of non-Newtonian fluids around us, but because most of us don't have a great understanding of the composition of matter, we don't even feel it even if we live in a non-Newtonian fluid world. According to experts, among these substances is our most common chewing gum.
It cannot explain the motion of microscopic particles, such as the wave-particle duality of light, and the spectrum of hydrogen atoms.
In the same circuit, the current in the conductor is directly proportional to the voltage at both ends of the conductor and inversely proportional to the resistance value of the conductor, which is Ohm's law, and the basic formula is i=u r. Ohm's law was proposed by George Simon Ohm, and in honor of his contribution to electromagnetism, the physics community named the unit of resistance Ohm, which is represented by symbols.
The second performance will be on July 10, Friday at 12 noon, on Mango TV.