Velocity - Wikipedia
WebVelocity is the speed in combination with the direction of motion of an object. Velocity is a fundamental concept in kinematics, the branch of classical mechanics that describes the motion of bodies. Velocity is a physical vector quantity: both magnitude and direction are needed to define it.
Velocity - Simple English Wikipedia, the free encyclopedia
WebVelocity is a measure of how fast something moves in a particular direction. To define it needs both magnitude and direction . If an object moves east at 9 metres per second (9 m/s), then its velocity is 9 m/s to the east.
What is velocity? (article) | Khan Academy
WebAverage velocity is defined to be the change in position divided by the time of travel. v a v g = Δ x Δ t = x f − x 0 t f − t 0. In this formula, v a v g is the average velocity; Δ x is the change in position, or displacement; and x f and x 0 are the final and beginning positions at times t f and t 0 , respectively.
Velocity | Speed, Acceleration, Motion | Britannica
WebApr 25, 2024 · velocity, quantity that designates how fast and in what direction a point is moving. A point always moves in a direction that is tangent to its path; for a circular path, for example, its direction at any instant is perpendicular to a line from the point to the centre of the circle (a radius).
Relative velocity - Wikipedia
WebThe relative velocity, denoted (also or ), is the velocity vector of an object or observer B in the rest frame of another object or observer A. The relative speed v B ∣ A = ‖ v → B ∣ A ‖ {\displaystyle v_{B\mid A}=\|{\vec {v}}_{B\mid A}\|} is the vector norm of the relative velocity.
Terminal velocity - Wikipedia
WebTerminal velocity is the maximum speed attainable by an object as it falls through a fluid (air is the most common example). It is reached when the sum of the drag force ( F d ) and the buoyancy is equal to the downward force of gravity ( F G ) acting on the object.
Speed - Simple English Wikipedia, the free encyclopedia
WebSpeed is a measure . It is velocity but without the direction. [1] [2] [3] [4] Finding speed. Speed is the distance an object moves in a given amount of time. [1] [2] [3] The distance is never negative. [5] . If a train takes 1 hour to travel 100 kilometers, it has a speed of 100 kilometers per hour (62 mph). In fact this is the average speed. [3]
Radial velocity - Wikipedia
WebThe radial velocity or line-of-sight velocity of a target with respect to an observer is the rate of change of the vector displacement between the two points. It is formulated as the vector projection of the target-observer relative velocity onto the relative direction or line-of-sight (LOS) connecting the two points.
Speed of light - Simple English Wikipedia, the free encyclopedia
WebThe speed of light, in any medium, which is usually denoted by , is a physical constant important in many areas of physics. It is denoted by 'c^0' especially in vacuum medium, although the symbol 'c' can be used to refer to that in any medium. It is exactly 299,792,458 metres per second (983,571,056 feet per second) by definition.
Escape speed - Simple English Wikipedia, the free encyclopedia
WebEscape speed is the initial speed that something would need to completely escape the gravity of a large body, like a star or a planet (such as the Earth ), by mere inertia . If a ball is thrown upwards while standing on the ground, the ball will reach a certain height (the faster thrown - the higher) and fall back down.
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