This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1889 Excerpt: ... short time and producing 1 fasp. Such a force is of the nature of a blow, and is usually called an Impulsive Force; and its effect is called an Impulse. 171. Impulsive forces are common; they occur, e.g. in the firing of a gun, in any explosion, in the hitting of a ball with a bat, in the driving of a nail, etc. 172. ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1889 Excerpt: ... short time and producing 1 fasp. Such a force is of the nature of a blow, and is usually called an Impulsive Force; and its effect is called an Impulse. 171. Impulsive forces are common; they occur, e.g. in the firing of a gun, in any explosion, in the hitting of a ball with a bat, in the driving of a nail, etc. 172. As we cannot, in general, estimate the time during which an impulsive force acts, we cannot know the force properly; but we may compare two such forces by the numbers of fasp or casgram produced. 173. The Unit of Impulse is the impulse of a force which generates Unit Momentum. The British Unit of Impulse is, therefore, the impulse of a force which generates a Fasp.1 The C.G.S. Unit of Impulse is the impulse of a force which generates a Casgram.2 174. Work.--When (as in very many practical examples) the kinetic energy is the same at the beginning and end of the motion, then (neglecting molecular forces) the Work Done by an Agent is simply equal to the Work Done against Gravity and Friction. When, in such cases, we know the distance moved and the time taken, we are said to know the Bate at which the Agent Works, and its Power. 175. Just as Weight gives a convenient measure of Force, so Work Done against Weight3 gives a convenient measure of Work. 1 This we may, for brevity, call a Btm. 2 This we may call a Olm. 3 It is worth while noting how well a sentence of this kind brings out the distinction between Mass and Weight. Mass is a quality of the body itself; but Weight is an outside influence, an external force which acts upon the body. 176. Suppose a mass of half-an-ounce to be raised vertically by an agent, at a place where the acceleration of gravity is 32 sfas, the kinetic energy being the same at the beginning and end of the motion. Then a ...
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