University:
Arizona State University
Course:
CHEM 101 | Introductory University Chemistry I
Academic year:

2024
Views:

248

Pages:

3
Author:

Mohammed N.

Newton's Laws of Motion-First and second Introduction to the Newton's Laws Dynamics is the branch of mechanics that studies the motion of objects and the causes that produce and modify it. Dynamics is based on three fundamental laws from which it is possible to solve any problem of mechanics, called Newton's Laws of Motion: The law of inertia -The law of momentum conservation. -Law of action and reaction Newton's First Law - The law of Inertia In an inertial frame of reference, an object either remains at rest or continues to move at a constant velocity, unless acted upon by a force. Any object, when is in a position to climb back up as a result of the speed acquired in the fall, reach the same initial height regardless of the trajectory (except for small variations attributable to friction). Let's imagine, for example, a pendulum fixed to a support: when it is brought from the equilibrium position to a certain height and then released, it rises again to the same height. With the Newton's first Law the concept of inertia is introduced, properties for which an object tend to maintain their state of rest or rectilinear motion. In order to vary these states, that is to put in motion or stop objects not subject to forces, it is necessary to apply a force Deepening No force may act on an objects or several forces may act on it, for example, to push or pull it. It should be pointed out that on Earth every object is always subject to at least one force. Which force? The force of gravity! But what if we consider an objects in a state of rest? There is in fact another force that acts on an objects in a state of rest, which has the same direction, the same magnitude and the opposite direction, carried out by another object on which the first one rests. It is important to enunciate the law of inertia by speaking of the sum of forces because it is not enough to consider a single force, but the sum of all the forces acting on an object. When we talk about a state of rest we mean the state of a stationary object with respect to a certain frame of reference. So if an object is at rest, its speed is zero. If we consider a stationary object and know that more forces act on it, the sum of which is zero, then the object will stay stationary and will not be induced to move in any direction Let's complete the analysis of the first law by objects in motion. If, in fact, we observe an object in rectilinear motion, we know that the sum of the forces acting on it is zero Newton's Second Law - The law of Momentum Conservation TIn an inertial frame of reference, the vector sum of the forces on an object is equal to the mass of that object multiplied by the acceleration of the object. The second Law is also valid in cases where several forces act. Considering for example two acting forces (F1 and F2), the F of the relationship should be considered as the resultant of F1 and F2 and the acceleration to as the vector sum of the accelerations a1 and a2 that the two forces would produce if they acted alone and independently Any force applied to an objects free to move produces an acceleration in the direction of the force directly proportional to the magnitude of the force

Newton's Laws of Motion-First and Second

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