![]() ![]() V̰ rel is the velocity of an object “A” relative to object “B”. In the vector form this is written as V̰ A rel B = V̰ A – V̰ B. Relative velocity is the velocity of an object relative to another object. Velocity is a relativistic variant, which means the laws of relativity must be applied for velocities compatible with the speed of light. Linear velocity has the direction of instantaneous movement whilst the angular velocity has the direction which is decided by the corkscrew method. Both linear velocity and angular velocity are vectors. Velocity also takes the form of angular velocity in that case velocity is equal to the rate change of angle. Mathematically speaking velocity equals dx/dt (read as d, dt x) according to the theories of calculus. Velocity is defined as the rate of change of distance. Velocity and relative velocity also have different characteristics when it comes to classical mechanics and relativistic mechanics. There are several types of coordinate systems, Cartesian coordinates, Spherical (polar) coordinates, cylindrical coordinates are to name a few. Non-inertial frames move in non-constant velocities (i.e. Inertial frames are defined as frames which are on rest or moving in a constant velocity. There are two types of frames, Inertial frames and non-inertial frames. ![]() A frame is a system of coordinates defined in order to make measurements more convenient. ![]() To get to know velocity and relative velocity much better we have to have a good understanding about frames. Both velocity and relative velocity are really important concept in the fields like engineering, mechanics, rocket science, relativity and almost all the fields as far as physics and engineering are concerned. Velocity and relative velocity are both measurements of how fast an object is moving. ![]()
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