I looked online but none of the explanations are helpful. 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. Take the example of the person sitting in a train moving east. Relative Velocity: We encounter occasions where one or more objects move in a frame which is non-stationary with respect to another observer. HelpYouBetter » Physics » One-Dimensional Motion » Relative Velocity – Concept, Definition, Formula, Problems, Examples. What does relative direction mean? See more. I just started learning about vector components and relative motion. What does relative mean..!! I don't understand what relative to something means. Special relativity is limited to objects that are moving with respect to inertial frames of reference. Specific gravity for liquids is nearly always measured with respect to water at its densest (at 4 °C or 39.2 °F); for gases, the reference is air at room temperature (20 °C or 68 °F). 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. Relative acceleration is the mathematical comparison of two object's accelerations, or for two points on a rigid body. Relative Motion in One Dimension. We introduce relative motion in one dimension first, because the velocity vectors simplify to having only two possible directions. 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. If someone could give me a very simple explanation, it would be appreciated. Friction Definition Physics: A force acting on the point of contact of the objects, which opposes the relative motion is called friction. Relativity, wide-ranging physical theories formed by the German-born physicist Albert Einstein. 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. What is Friction in Physics? In this article, we are going to discuss the concept, definition and formula for relative velocity with the help of solved problems and examples. Meaning of relative direction. A rigid body is an extended object that doesn't flex, such as a boomerang. Relative motion is the calculation of the motion of an object with regard to some other moving object. For example, a boat crosses a river that is flowing at some rate or an aeroplane encountering wind during its motion. Relative definition, a person who is connected with another or others by blood or marriage. 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