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## Definitions and concepts of movement solid

### Definition of motion solid

In rectilinear motion, the path that describes a straight line mobile. Some notable movement solid types are:• Uniform rectilinear movement: when the speed is constant.

• Uniformly accelerated rectilinear motion: when the acceleration is constant.

• One-dimensional simple harmonic motion: when the acceleration is directly proportional to the elongation (distance to the equilibrium position) and is always directed toward the position of equilibrium.

In mechanics the rectilinear motion is one of the simplest examples of movement, in which speed has constant direction (although acceleration can have in some cases), also there is force and Acceleration, these are always parallel to the speed. This allows to treat the rectilinear motion by scalar equations, without, using the formalism of vectors.

Rectilinear motion in classical mechanics

In rectilinear motion, trajectory that describes the mobile is a straight line. Some notable types of rectilinear motion are:

• Uniform rectilinear motion: when speed is constant:

• Uniformly accelerated rectilinear motion: when the acceleration is constant.

• One-dimensional harmonic motion: sinusoidal oscillation around an equilibrium point

Equations of motion

The trajectory of a particle is straight when its acceleration is zero (without being speed) or when its acceleration has no component normal to the speed. The rectilinear motion is, therefore, a particular case of the movement general in space, but due to the abundance of problems and situations in which we will find it, will devote you special attention. Since the vectors and are directed along the trajectory, you will want to choose the origin O on it so that the position vector will also be located on it. Then, to be parallel to each other all the vectors that describe the motion of the particle to us we can dispense with the vector notation.

### Concept of moving solid

The rectilinear movements that follow a straight line, are the simplest movements. More complicated movements can be studied as the composition of elementary rectilinear movements. Such is the case, for example, of the movements of projectiles.The rectilinear motion can be expressed or submitted as

Uniform rectilinear motion, or as

Uniformly accelerated rectilinear motion.

The latter can, in turn, submitted as freefall or vertical lift.

Uniform rectilinear motion

Uniform rectilinear motion (MRU) was defined, for the first time by Galileo in the following terms: "by equal or uniform movement understand that where the spaces covered by a mobile in equal times, taken as they are taken, are equal among themselves", or, put another way, is a movement of speed constant v.

The MRU is characterized by:

(a) movement that is performed in a single direction on the horizontal axis.

b) constant speed; It involves magnitude, direction and address unchanged.

(c) the magnitude of the velocity is called quickly. This movement does not present Acceleration (acceleration = 0).

Concept of rapidity and speed

Very easy to confuse, they are often used as equivalent to refer to one or the other.

But the rapid (r) represents a numeric value, a magnitude; for example, 30 km/h.

On the other hand speed represents a vector that includes a numeric value (30 Km/h) and also has a sense and a direction.

When we talk about quickly there will be two very important items to consider: the distance (d) and time (t), intimately related.

Like this:

If two mobile phones take the same time at different distances, it has faster one that runs the largest of them.

If two mobile phones run the same distance at different times, it has faster one who does it in less time.

### Definition of motion solid

A uniform rectilinear motion is a phenomenon in three variables come together to write a constant displacement, a deformable straight and without any acceleration. The MRU in acronym (uniform rectilinear motion) is one of the forms of displacement that are seen first in basic education diversifies in the matter of physics, as it is the simplest of movements and its calculation depends on variables whose denotation is also constant. The graph shows how the time relationship with the distance (expressed in metres) is growing, while the speed is kept constant over time since otherwise it would cease to be uniform and acceleration would be present in the graph.Formulas that are learned to calculate the uniform rectilinear movement are simple, applying given variables in order to calculate through clearing each of them in relation to the other. Below we will explain them:

-The distance (D) which is traveled is calculated by multiplying the speed (V) which we must remember that s always constant with time (T) which leads the tour leaving follows D = V * t.

-For the time (T) divide the distance (D) between the speed (V) obtaining T = D / V.

-The speed (V) is also obtained under the same precept V = D / t.

Symbology with the process of clearing system also vanishes leaving the corresponding units for every magnitude, must always be well, be careful with not present the response of the test with a different drive than the established for each well the no correspondence with the data and the units, there would be. The uniform rectilinear motion is an ideal situation, in which there are no agents that disrupt the condition, if there are them they would change the methodology to be applied, so Isaac Newton stated in the laws of physics that until now remain in force in the fields in which the MRU is studied and which complement the theory. The graphical representation of the distance function of time gives rise to a straight line whose slope corresponds to the speed.