Interaction is an action that is reciprocal. All bodies are able to interact with each other using mechanical motion, inertia, force, density of matter and, in fact, the interaction of bodies. In physics, the action of two bodies or a system of bodies on each other is called interaction. It is known that when bodies approach each other, the nature of their behavior changes. These changes are reciprocal. When breeding bodies over significant distances, the interactions disappear.
In the interaction of bodies, all bodies always feel its result on themselves (after all, when exposed to something, always follows the bestowal). So, for example, in billiards, when a cue hits a ball, the latter flies off much more strongly than a cue, which is explained by the inertia of the bodies. The types and measure of the interaction of bodies are determined precisely by this characteristic. Some bodies are less inert, others more. The greater the mass of the body, the greater its inertness. The body, when interacting, changes its speed more slowly, has a large mass and is more inert. A body that changes its speed faster has less mass and is less inert.
Strength is a measure of the interaction of bodies. Physics distinguishes four types of interactions that are not reducible to each other: electromagnetic, gravitational, strong and weak. Most often, the interaction of bodies occurs when they come into contact, which leads to a change in the velocities of these bodies in an inertial reference frame, which is measured by the force acting between them. So, to set in motion a stalled car, pushed by hands, it is necessary to apply force. If it is necessary to push it uphill, then it is much harder to do, because this will require a lot of strength. The best option is to apply force along the road. In this case, the magnitude and direction of the force are indicated (note, the force is a vector quantity).
The interaction of bodies also occurs under the influence of mechanical force, the result of which is the mechanical movement of bodies or their parts. Strength is not a matter of contemplation; it is the cause of movement. Every action of one body in relation to another manifests itself in motion. An example of the action of a mechanical force generating motion is the so-called domino effect. Skillfully placed domino knuckles fall one after another, transmitting movement further along the row, if you push the first knuckle. There is a transfer of motion from one inert figure to another.
The interaction of bodies in contact can lead not only to a slowdown or acceleration of their velocities, but also to their deformation - a change in volume or shape. A vivid example is a sheet of paper squeezed in a hand. Acting on it by force, we lead to an accelerated movement of parts of a given sheet and its deformation.
Any body resists deformation when they try to stretch, squeeze, bend it. From the side of the body, the forces that prevent this (elasticity) begin to act. The force of elasticity is manifested from the side of the spring at the moment of its tension or compression. The load that is pulled along the ground by the rope is accelerated because the elastic force of the stretched cord acts.
The interaction of bodies during sliding along the surface separating them does not cause their deformation. If, for example, the pencil slides over the smooth surface of a table, ski, or sledges over compacted snow, a force that prevents slipping acts. This is the friction force, depending on the properties of the surfaces of the interacting bodies and on the forces pressing them against each other.
The interaction of bodies can occur at a distance. The action
of gravitational forces, also called gravitational, occurs between all the bodies around, which can be noticeable only when the bodies have the dimensions of stars or planets.
Gravity is formed from the gravitational attraction of any astronomical body and
centrifugal forces that are caused by their rotation. So, the Earth attracts the Moon to itself, the Sun attracts the Earth, therefore the Moon makes revolutions around the Earth, and the Earth, in turn, revolves around the Sun.
Electromagnetic forces also act at a distance. Despite the lack of contact with any body, the compass needle will always turn along the line of the magnetic field. An example of the action of electromagnetic forces is
static electricity, which often occurs on the hair when combed. The separation of charges on them is due to friction. Hair, charging positively, begin to push off from each other. Such static often occurs when wearing a sweater or wearing hats.
Now you know what the interaction of bodies is (the definition turned out to be quite detailed!).