Question

Please explain newton's law's??​

Answer 1

Ответ:

Newton's First Law

Newton's First Law states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force. It may be seen as a statement about inertia, that objects will remain in their state of motion unless a force acts to change the motion. Any change in motion involves an acceleration, and then Newton's Second Law applies. The First Law could be viewed as just a special case of the Second Law for which the net external force is zero, but that carries some presumptions about the frame of reference in which the motion is being viewed. The statements of both the Second Law and the First Law here are presuming that the measurements are being made in a reference frame which is not itself accelerating. Such a frame is often referred to as an "inertial frame". The statement of these laws must be generalized if you are dealing with a rotating reference frame or any frame which is accelerating.

Newton's First Law contains implications about the fundamental symmetry of the universe in that a state of motion in a straight line must be just as "natural" as being at rest. If an object is at rest in one frame of reference, it will appear to be moving in a straight line to an observer in a reference frame which is moving by the object. There is no way to say which reference frame is "special", so all constant velocity reference frames must be equivalent.

Newton's Second Law

Newton's Second Law as stated below applies to a wide range of physical phenomena, but it is not a fundamental principle like the Conservation Laws. It is applicable only if the force is the net external force. It does not apply directly to situations where the mass is changing, either from loss or gain of material, or because the object is traveling close to the speed of light where relativistic effects must be included. It does not apply directly on the very small scale of the atom where quantum mechanics must be used.

Data can be entered into any of the boxes below. Specifying any two of the quantities determines the third. After you have entered values for two, click on the text representing the third to calculate its value.

F=m*a

Newtons =

kg *

m/s2

pounds =

slugs *

ft/s2

Newton's Third Law

Newton's third law: All forces in the universe occur in equal but oppositely directed pairs. There are no isolated forces; for every external force that acts on an object there is a force of equal magnitude but opposite direction which acts back on the object which exerted that external force. In the case of internal forces, a force on one part of a system will be countered by a reaction force on another part of the system so that an isolated system cannot by any means exert a net force on the system as a whole. A system cannot "bootstrap" itself into motion with purely internal forces - to achieve a net force and an acceleration, it must interact with an object external to itself.

Without specifying the nature or origin of the forces on the two masses, Newton's 3rd law states that if they arise from the two masses themselves, they must be equal in magnitude but opposite in direction so that no net force arises from purely internal forces.

Newton's third law is one of the fundamental symmetry principles of the universe. Since we have no examples of it being violated in nature, it is a useful tool for analyzing situations which are somewhat counter-intuitive. For example, when a small truck collides head-on with a large truck, your intuition might tell you that the force on the small truck is larger. Not so!

Answer 2

Newton's Laws of Motion are fundamental principles in classical physics formulated by Sir Isaac Newton in the late 17th century. These laws describe how objects move and interact with forces. There are three main laws:

1. Newton's First Law of Motion (Law of Inertia): "An object at rest stays at rest, and an object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced external force."

   This law essentially states that an object will maintain its state of motion (or rest) unless an external force is applied to it. In other words, if there are no forces acting on an object, it will either stay still or move in a straight line at a constant velocity. This principle is often referred to as the law of inertia.

2. Newton's Second Law of Motion: "The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. The direction of the acceleration is in the direction of the net force."

   Mathematically, this law can be expressed as F = ma, where:

   • F represents the net force applied to an object,
   • m is the object's mass, and
   • a is the resulting acceleration of the object.

   This law essentially tells us that the force applied to an object determines how much it will accelerate, and the more massive the object, the less it will accelerate for the same force.

3. Newton's Third Law of Motion (Action-Reaction Law): "For every action, there is an equal and opposite reaction."

   This law states that whenever one object exerts a force on another object, the second object exerts an equal and opposite force on the first object. In other words, if Object A applies a force on Object B, Object B will apply an equal force in the opposite direction on Object A. This law helps explain the mechanics of propulsion, such as the way a rocket works by expelling mass in one direction to generate thrust in the opposite direction.

Together, these three laws provide a foundation for understanding how objects move and interact in the presence of forces. They are essential principles in classical mechanics and have been fundamental to our understanding of the physical world for centuries.