Newton s second law formula F ma, the following recognition is correct

First of all, mass does not change with any change in time or space, it is an inherent property of matter. For example, if you put something on the Earth, the weight is different from that of the Moon, but the mass m is constant. So options A and B are wrong.

And a is the acceleration, for example, the acceleration on each planet is different. f is the resultant force, which exists due to the existence of a, which is originally a ratio definition, which is thought up by man. Physics must not be treated as mathematics!!

The landlord should pay attention to such a topic in the future, if it involves positive and inverse proportionality, it is necessary to see if there is a hypothesis of quantification.

For example, in this question, A does not say that F is certain, and B does not say that A is certain, so the situation is uncertain, and there is no so-called positive and inverse relationship.

ABC is mentioned in all three options"quality is **proportional*"Question, obviously wrong. Mass is an "intrinsic property of an object", and the mass of a particular object is not affected by these factors, regardless of the external force and acceleration.

However, the magnitude of the mass can be measured by Newton's second law, which reflects the dynamical law of the relationship between external forces and acceleration.

One quantity must be certain before the other two quantities can be compared. So d is correct. If you want to choose a, you must first state that f must be before you can say that the mass of the object is inversely proportional to the acceleration of the object. Otherwise, it would be wrong.

According to A, if an object accelerates greatly, its mass will decrease, which is obviously false. The object is there, and the mass is determined. This formula actually shows that for an object, the net force acting on it is large, and its acceleration is greater.

Whereas, the mass of the object does not change with f or a.

For the acceleration of the same object changes with the change of force, Niu Er is based on the constant mass of the object, and d also says that the acceleration is proportional to the external force when the mass is certain (the proportion coefficient is m), and the example you gave clearly changes the mass.

To satisfy a must meet the condition that the external force is constant, and to meet b must meet a certain condition of acceleration, so to satisfy the proportional and inverse proportionality, a variable must be controlled.

a The mass and velocity of matter are unrelated quantities, and does something heavy necessarily move slowly? That's right

b For example, if an object is 1kg and the force is 10N, if the force becomes smaller, will the mass become smaller? Of course not!

The mass of an object is an indication of how much of the substance it contains. It has nothing to do with force and mass, but acceleration is determined by both force and mass

Child, because mass is an intrinsic property of an object, it is only related to the object itself, and nothing else, understand?

A does not have the premise that f is immutable. There must be a quantitative.

When only one of the three variables is invariant, the other two variables have a proportional relationship!

In the case that the mass m of the hook code is much less than the mass m of the trolley, it can be approximated that the force f of the rope pulling car is equal to the gravity of the hook code mg

Analysis: The car and the hook code have the same acceleration a to move together, and they are regarded as a whole, and the combined external force of this whole is mg, and the application of Niu Er's law has:

mg=(m+m)a

a=mg/(m+m)

Then isolate the car, and the external force of the car is the rope tension f:

f=ma=mmg (m+m)=mg (1+m m) when m is much less than m: m m approximate zero, f approximate and so on mg If this condition is not met, f mg, mg is used as f in the test, that is, f is larger than the actual value.

In Newton's second law, m in f=ma is ().

a.Inertial mass.

b.Power mass.

c.Neither.

d.Gravitational Tamwoo mass.

Positive or sure answer staring at the disadvantages: a

A law refers to a definite law, which is a law that is derived from summarizing facts and is proved through facts.

Newton discovered the law that the acceleration force of an object is directly proportional to the force experienced by the object, and inversely proportional to the mass of the object.

The International Federation of Units (IFAU) defines the units of force according to the units of length, time, and mass, so that the coefficient of Newton's second law is 1, and the unit of force is the derived unit.

The international basic unit is 7:

Length: m (m);

Mass: kilograms (kg);

Current: Ampere [pellet](a);

Thermodynamic temperature: open [Ervin] (k);

The amount of matter: mol;

Luminous intensity: Kan [Dela] (cd).

The rest of the units are derived from the above ones.

I don't know if the landlord knows the ins and outs, but he can communicate further.

Newton's second law.

Newton's second law is f=ma

f} ∝m

f} = k m If the SI unit system is followed, i.e., the single split of the net force is n, the unit of mass is kg, and the unit of acceleration is meters per square second (m s-2).Since, when a 1 kg object accelerates at 1m s-2, the net force is 1 Newton, therefore, the constant term (k) is 1Therefore, this formula can be simplified to:

f = ma look.

f=ma is Newton's second law formula. This is a vector expression, and the direction of acceleration and resultant force is always the same. where f denotes the net force acting on this object, which is the net force.

m (mass) must be in kg and a (acceleration) must be in m s.

Newton's second law of motion.

Newton's second law of motion applies only to particles. For the particle system, the isolation method is generally used when using Newton's second law of motion, or Newton's second law of the particle system is used. Newton's law of motion applies only to inertial frames of reference.

The inertial frame of reference refers to the frame of reference in which Newton's laws of motion are established, and in non-inertial frames of reference, Newton's second law of motion does not apply.

Newton's second law of motion only applies to macroscopic problems. Quantum mechanics must be used to solve microscopic problems. When the linear degree of motion of an object can be compared with the de Broglie wave of the object, the momentum and position of the object cannot be accurately known at the same time due to the uncertainty relation of the motion of the Libbo particle, so the Newtonian dynamics equation cannot be solved without accurate initial conditions.

Newton's second law can be formulated by the formula: a=f m

Its physical meaning is that the acceleration a of the object is proportional to the resultant external force f of the object, inversely proportional to the mass m of the object, and the direction of acceleration is the same as the direction of the resultant external force.

Therefore, m refers to the mass of the object, in kg; a refers to the acceleration of an object in meters of square seconds.

Newton's second law is used to describe the relationship between force and motion, which is the solution.

The approach to simple dynamics problems, as we will talk about later, the momentum theorem and the law of conservation of momentum are both tools used to solve dynamical problems. There should be a specific concept book, and the f refers to the resultant external force experienced by the object. Vector.

a refers to the acceleration vector produced under the action of the resultant external force, and the direction is consistent with the direction of the resultant external force. m refers to the mass of the object.

The general steps to solve the problem are: 1) Force analysis to find the resultant force (2) to find a according to Newton's second law (3) according to the kinematic formula (v=v0+at··· Find the required amount. Or vice versa, find acceleration according to kinematics...

f=m×a

f is the resultant force experienced by the object.

m is the mass of the object.

a is the acceleration of the object.

It must be that f is regarded as an hypotenuse and decomposed into components at adjacent edges, and how to do it depends on the specific problem.

Here the combined external force is fcos. An example of this can be horizontal motion: the angle between the force f and the horizontal direction is . In the case that the other vertical component of the fsin and the supporting force is canceled out by gravity, the friction force is negligible.

Thus, according to Newton's second law, fcos = ma

So there is: a=fcos m

Acceleration = Force mass. is the angular difference between force and velocity.