(Physics) The rate of change of velocity with respect to time.
The rate of change of the velocity of a moving body. An increase in the magnitude of the velocity of a moving body (an increase in speed) is called a positive acceleration; a decrease in speed is called a negative acceleration. Acceleration, like velocity, is a vector quantity, so any change in the direction of a moving body is also an acceleration. A moving body that follows a curved path, even when its speed remains constant, is undergoing acceleration.
Find another word for swiftness. In this page you can discover 18 synonyms, antonyms, idiomatic expressions, and related words for swiftness, like: acceleration, velocity, rapidity, speed, celerity, dispatch, expedition, expeditiousness, fleetness, haste and hurry.
He was surnamed Cursor from his swiftness of foot.
The speed with which it bounds upon its prey, when loosed from the cart, exceeds the swiftness of any other mammal.
The swiftness, the strength and the highly developed power of scent in the dog, have made it a powerful ally of man against the other animals; and perhaps these qualities in the dog were necessary to the establishment of society.
The specific name was given on account of the extraordinary swiftness of the animal.
of New Zealand, p. 362): "The kiwi is in some measure compensated for the absence of wings by its swiftness of foot.