Titlebook: ;

刺激

Kinematics,nd it will provide a basis for later modelling in other branches of mechanics. From time and displacement, we derive the quantities velocity and acceleration. All of these, with the exception of time, are vector quantities and can be expressed in an algebraic vector form. Not surprisingly, therefore

Graduated

Force as a Vector,r we wish to introduce a force into a problem in mechanics in two or three dimensions, we need to be specific in its description in terms of its magnitude, direction and point of application. While we are concerned with the particle model, the point of application will have no significance, as it is

背景

Using Energy,cern is with mechanical energy. Mechanical energy is of two types: kinetic energy and potential energy. . is the energy of a body by virtue of its motion. . is the energy of a body by virtue of its position. A body is held so that it is stationary and then released; if it moves then it possesses pot

Nonthreatening

Collisions,strate this with a simple example. A heavy lorry and a car are travelling side by side at the same speed and need to stop at a red light. Common experience leads us to expect that the braking force required to bring the lorry to a stop must be greater than that required to stop the lighter car. Newt

DNR215

Motion under Gravity in One Dimension,ving vertically under the influence of the Earth’s gravity, with or without resistance. Nevertheless, falling raindrops, parachutists, balls and so on, and upwardly projected bullets, missiles and balls comprise a very important class of problems. Because of their limited scope, we can solve virtual

作茧自缚

Projectiles,flight of a golf ball, a high jumper or the motion of a jet of water from a hose pipe. The analysis of projectile motion is one of the most common uses of kinematics in the real world. The number of occasions in any one day that you will encounter examples of projectile motion are many. If you are i

体贴

Vibrations,as it struggles uphill, or the twang of a guitar string. The essential ingredient common to all vibrations is the to-and-fro motion, without there being any overall movement in any direction. This chapter will enable us to under-stand more about all types of vibrations. Engineers need to understand

Rustproof

Variable Mass Problems,ng way to think of an impulse is in terms of an external agent that alters momentum. Common such agents are baseball or cricket bats striking, and significantly changing, the momentum of a moving ball. The batter (usually) feels a jolt in the wrists, and this is the impulse. This type of impact, col

兽群

Rotating Axes,ght, this seems a straightforward requirement to satisfy. Further thought will, however, reveal the difficulty. The Earth is rotating about its axis, and the centre of the Earth rotates once a year around the Sun. Hence, in absolute terms, one is hard pressed to find a point that is not moving; ther

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