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For example, you are in a bus and it goes with the velocity of 50 m/s to the east, then a truck passes you with a velocity of 60m/s to the east. Relative density, or specific gravity, is the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material. RELATIVE MOTION When we talk about the velocity of something we first determine a reference point and then according to this reference point we say the velocity of the object. Take the example of the person sitting in a train moving east. I don't understand what relative to something means. We introduce relative motion in one dimension first, because the velocity vectors simplify to having only two possible directions. Special relativity is limited to objects that are moving with respect to inertial frames of reference. Relative definition, a person who is connected with another or others by blood or marriage. What does relative mean..!! What does relative direction mean? | Definition, Examples, Types of Friction – Laws of Motion. Relative velocity in two dimensions. Thus, the motion is not calculated with reference to the earth, but is the velocity of the object in reference to the other moving object as if it were in a static state. Relative Motion in One Dimension. Meaning of relative direction. This is a consequence of the translational invariance of the laws of physics: nature, loosely speaking, behaves the same no matter what direction one moves. General relativity is concerned with gravity, one of the fundamental forces in the universe. HelpYouBetter » Physics » One-Dimensional Motion » Relative Velocity – Concept, Definition, Formula, Problems, Examples. See more. Relativity, wide-ranging physical theories formed by the German-born physicist Albert Einstein. Definition of relative direction in the Definitions.net dictionary. I still don't understand the meaning of relative. When the truck is next to the bus you feel that as you go backward to the west I looked online but none of the explanations are helpful. Friction Definition Physics: A force acting on the point of contact of the objects, which opposes the relative motion is called friction. For example, a boat crosses a river that is flowing at some rate or an aeroplane encountering wind during its motion. If someone could give me a very simple explanation, it would be appreciated. Relative motion is the calculation of the motion of an object with regard to some other moving object. Relative Velocity: We encounter occasions where one or more objects move in a frame which is non-stationary with respect to another observer. I cannot breach onto the concept of Einstein's Principles of Relativity without knowing the meaning of it!!! A rigid body is an extended object that doesn't flex, such as a boomerang. 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