what is the difference between speed and velocity?
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A simple explanation:\n\nSpeed is just a magnitude. So 5 miles per hour is a speed. \n\nVelocity is a magnitude and a direction. So 5 miles per hour north is a velocity. \n\nA more complicated explanation:\n\nSpeed is what is known as a scalar, or just a number, whereas velocity is a vector, represented as an arrow with some length (the length of a velocity vector is its magnitude, called speed). In 3 dimensions, speed is a single real number, s. Velocity would be a triple of numbers, (V1, V2, V3). The length of the velocity vector is called its magnitude, and it is sqrt[(V1^2) + (V2^2) + (V3^2)]. The magnitude of a velocity vector is the speed.
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Speed is a scalar quantity. In other words it has only a magtitude.\nVelocity and Acceleration is a vector quantity. In other words it has both a magnatude and direction.\n\nSpeed refers to how fast an object is moving.\nExample: 120 mi/hr\nFormula: \naverage speed = distance / time\n\nVelocity refers to the rate at which an object changes its position.\nExample: 33 m/s, east\nFormula: \naverage velocity = displacement (change in position) / time\n\nAcceleration is the rate at which an object changes its velocity.\nExample: \n10 m/s/s, east\nFormula: \nacceleration = change in velocity / time
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Eric L is right. Kinetic energy is proportional to speed SQUARED. It is momentum that is linearly proportional to speed.
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acceleration = change in speed / time taken\n\nThe units are metres per second per second\n\nFor example: \nIf a car starts at 0 m/s and over a period of 10 seconds increases its speed to 25 m/s then its acceleration is 25/10 = 2.5 m/s^2.\n\n-------------------------------------------\n\nAcceleration is the rate of change of velocity, hence the units.  If you were to plot a graph of velocity against time the gradient would be the acceleration.\n\nJust as velocity can be written v=ds/dt acceleration can be written a=dv/dt.
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B. Velocity is a vector, meaning it has magnitude (size) and direction. Speed is a scaler, therefore does not depend on direction.
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acceleration is the increase in velocity per unit of time.  As velocity has units of length per time (m/s) then acceleration has units of length per time - per time (m/s^2)\n\n- it can be measured in any units of length per time per time.
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Velocity is a vector quantity.\nSo,if two velocities happen to be parallel to each other(same or opposite direction ),they are added algebraically.i.e.mere sum or difference as the direction would be same as the two given vectors.\n\nab----------------->      cd<------\nThen resultant   ------------------------->\n  +                                                         \n.............................................<--------\n=........................--------------->\n\nWhat made u think that resultant can be in diff. direction\nEven try using the triangle law .It gives the same result.
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Speed is distance/time.\n\nSo for examle if a car went 120 miles in an hour their speed would be 120 miles/per hour.
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The 'speed of sound (from Latin celeritas, "velocity") varies depending on the medium through which the sound waves pass. It is usually quoted in describing properties of substances (e.g. see the article on sodium). In conventional use and in scientific literature sound velocity v is the same as sound speed c. Sound velocity c or velocity of sound should not be confused with sound particle velocity v, which is the velocity of the individual particles. More commonly the term refers to the speed of sound in air. The speed varies depending on atmospheric conditions; the most important factor is the temperature. The humidity has very little effect on the speed of sound, while the air pressure has an effect (see equations later in the page). Sound travels slower with an increased altitude (elevation if you are on solid earth), primarily as a result of temperature and humidity changes.
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speed is distance divided by time. So work out the distance the water needs to travel and divide by the time taken. Add more details if you want to know a more complex way to work out the speed.
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Dear Little Giggl:  I think the answer to your question is VELOCITY, but it is NOT viscosity - which is the RESISTANCE property in liquid, that prevents quick flowing.\n\nFlow dynamics is said to be measured according to density and pressure which help determine velocity measurement of liquid.\n\nThank you for the question. . .it helped me to learn something.
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Horizontal velocity is the speed of something flat ot the ground like a car on the road.\n\nVertical velocity is the up/down speed, like a ball thrown straight up.\n\nIf you throw something on an angle (not straight up) it has some vertical velocity in the up direction and some horizontal velocity along the ground.
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In simple terms, velocity is the measure of displacment compared to time.  Not distance!  Distance is how far an object has moved period.  Displacment is how far an object has traveled from it's initial position.  Therefore, the derivative of the position function (with respect to time "dt")  is the function of velocity! dx/dt
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Its like instantaneous speed. It is the speed or wateva you are trying to find between two really reallly reallllly close points. Example if you are trying to find the derivitive of 2 then plug in 1.999999 or 2.000001 into the equation, doesn't matter. \n\nOtherwise, it is the slope of the tangent of a point.
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Firstly, please allow me to substitute your term "speed" for the more accurate term "velocity".\n\nAll particles and waves have an intrinsic velocity  in a vacuum.  The subatomic particle which makes up light is the photon.  The photon travels at an average maximum velocity of 3x10^8 m/sec in a vacuum.  For the exact numerical speed, here is a good source\n\nhttp://en.wikipedia.org/wiki/Speed_of_light\n\nbut for the purposes of almost all calculations, 3x10^8m/sec is used.  There are physical forces which can slow down the speed of light, and the chief force is gravity.\n\nDarkness is the absence of light, and therefore, the absence of any photons. Therefore, the concepts of speed and velocity are not applicable.\n\nP.S.  There is only one particle theorized to be faster than the speed of a photon, or more aptly put, faster than the speed of light.  That subatomic particle is the "tachyon".  It is further theorized that , because it is travelling faster than the speed of light, it is also travelling backward in time.\n\nP.P.S.  Many of the theories in physics are derived from solutions to various "so-called" unsolvable problems derived from math theory.  In this sense , physics and math go hand in hand.  Therefore, many physics theories are simply supported by math equations until a real life proof can be generated, characterized properly, qualified, and quantified.  The problem here is that just because a math equation may have a solution , it alone BY NO MEANS is proof in and of itself of the existence of subatomic particles and physical phenomenae.  It can only be used as a measuring stick,of sorts,  in order to look for the existence, and therefore, FORMAL PROOF of such phenomenae.
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Imagine someone hit you with a ball. How much would it hurt? Depends doesn't it. If they threw a nerf ball at you really fast you would hardly feel it. If they threw a baseball at you at a much slower speed the impact would be much greater. The nerf ball has less mass than the baseball but was thrown at a greater velocity. Velocity is speed in a particular direction. How much you feel it in this case is due to the ball's momentum. Since momentum depends on both the mass and velocity of a moving object we express momentum in the following formula: Momentum equals mass times velocity or mom = m x v. Impetus is a less specific word. It is defined as the quality described by the mass of an object and its motion. Impetus is less specific (less to the point, vague) than momentum because it depends upon motion rather than velocity.
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Simply put, velocity is speed with direction of movement specified, thus velocity is a vector, but speed is not a vector.\n\nVectors are quantities that have a size and a direction.\nSome quantities have both a size and a direction.\n\nLet us take a look at the concept of velocity as it is used in physics. Velocity can be measured. It is a quantity that can be written down. However, in the study of physics we would say the the following statement does not completely explain nor express a velocity:\n\nv = 25 m/s\n\nThe above statement would read, "The velocity equals 25 meters per second." The size of the velocity would be 25 meters per second. That, though, is not enough. It turns out that velocities have more that just a size. They also have a direction. For example, a statement correctly states a velocity would say, "The velocity equals 25 meters per second North ." Notice that two things are necessary to state a velocity, as size, that is, 25 meters per second, and a direction, North. Now this is how you talk about velocities when you are studying physics. The size of the velocity is actually called the speed. So, we would say that velocity is made up of a speed and a direction.\n\n Quantities like this, that have sizes and directions, are called vectors.\n\nBy direction we mean relating to North, South, East, and West.\nWell, it should not be too difficult to understand that the size of the velocity, that is, 25 meters per second, is a number. The direction, also, is described with a number. In the above discussion we stated the direction as North. Almost always directions are a bit more complicated that that. Usually directions are stated using language such as...\n\nThe direction is 40 degrees North of East.\n\nSo, a complete vector description of velocity could be written as...\n\nThe velocity is 38 m/s in a direction of 52 degrees West of North.