Lecture 2_ Displacement_ Speed_ Average velocity_ Instantaneous velocity_ Gravity and accelerationCutnell+Johnson: chapter 2Most physics classes start by studying the laws describing how things move around. Thisstudy goes by the name of Mechanics. The reason people usually start here is that most ofthe notions come straight out of our everyday life: velocity, acceleration, rotation, gravity. Therough idea is simple: forces act on bodies, and the bodies move, rotate, stretch, crack, whatever.Mechanics means how bodies react to forces.As architects, you'll be particularly interested in a sub_eld of mechanics called Statics. Thismeans studying forces where the body (e.g. a building) doesn't move. However, this is often amore di_cult problem: all the forces have to balance to prevent the motion. Thus it is _rst iseasiest to study motion, without worrying about the forces which cause the motion. Then wewill study forces.DisplacementTo really isolate what's going on without additional complications, we'll _rst study onlymotion in one dimension. The coordinate describing this dimension we'll call x. The value of xis called the position. As you'll see, it doesn't matter at which point you de_ne x = 0. This isan arbitrary de_nition, and changing this won't change any physical results at all.When an object moves, the most obvious thing to look at is its displacement. In words,this means \how its _nal position has changed from its original position". To express th ...
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