speed definition: 1. how fast something moves: 2. very fast movement: 3. how fast something happens: . The speed of sound is a term used to describe the speed of sound waves passing through an elastic medium. Average Speed. When something picks up too much speed, it can run off course, like a kid on a bike zooming uncontrollably down a steep hill. Science terms... having to do with speed acceleration mass displacement etc: Terms in this set (17) Speed. Instantaneous Speed: Definition, Formula & Example. Any force which lessens the vector can be considered negative speed. Graphing Position & Speed vs Time: Practice Problems 5:05 Force: Definition and Types 7:02 Objects with Two or More Forces: Finding the Total Force Result 4:58 High in the sky over northwestern China, a wedge-shaped unmanned vehicle separated from a rocket. Despite hype and technological hurdles, a hypersonic arms race is accelerating. The main difference with a velocity / time graph, is when the line goes down, it may mean the object is decelerating or it is moving in the opposite direction, so it is possible to have a negative velocity. speed of sound: The speed of sound, or of acoustic traveling waves, is a physical constant for any given medium at a specific pressure and temperature. the distance traveled divided by the time taken to travel the distance. An example of an object moving at a constant speed is a satellite. Speed in science means vector (direction and velocity). Coasting along at up to Mach 6, or six times the speed of sound, the Xingkong-2 “waverider” hypersonic cruise missile (HCM) bobbed and weaved through the stratosphere, surfing on its own shock waves. In a vacuum, the speed of light is 299,792,458 meters per second. There are four types of speed: uniform speed, variable speed, average speed, and instantaneous speed. ... Amanda holds a Masters in Science from Tufts Medical School in Cellular and Molecular Physiology. A satellite and other objects in space have a constant speed but a variable velocity, because their direction changes. Speed of light, speed at which light waves propagate through different materials. In dry air at sea level at 0 degrees Celsius , the speed of sound is approximately 331.4 meter s per second (m/s). Temperature, pressure, and humidity affect this value to some extent. It is the change in the position of an object with respect to time. Speed most often describes acceleration or a high rate of motion. Instantaneous speed definition: a scalar measure of the rate of movement of a body expressed as the rate of change of... | Meaning, pronunciation, translations and examples found by dividing the total distance traveled by the time taken. A spacecraft's retro rockets are a good example. Velocity. Learn more. 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