PCS 120 Chapter Notes - Chapter 1: Projectile Motion, Rotation Around A Fixed Axis, Circular Motion
17 Oct 2016
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1.1 Motion Diagrams
-Motion: the hage of a ojet’s positio ith tie
-Trajectory: the path along which the object moves
Four basic types of motion
Translational Motion: linear, circular, projectile – in which the object moves through space
-Linear motion → not necessarily 1-dimensional
-Circular motion → motion around the a centre
-Projectile motion → curved linear motion
Rotational Motion: hange of the ojet’s angular position
-Rotational motion → rotates on its own axis
Motion Diagram: oposite photo shoig a ojet’s positio at seeal eually spaed istats of
time
-An object that has a single position in a motion diagram is at rest
-Images that are equally spaced indicate an object moving with constant speed
-An object with images that have increasing distance between them is speeding up
-An object with images that have decreasing distance between them is slowing down
-A more complex motion shows aspects of both slowing down and speeding up (ie: throwing a ball from
center court)
1.2 The Particle Model
-Particle: an object that can be represented as a mass at a single point in space
→has no size, shape, or distinction between top/bottom, front/back
-We can represent objects as a simple dot if we treat them as a particle
-The particle model of motion is a simplification in which we treat a moving object as if all of its mass
were concentrated at a single point
→Not all motions can be reduced to the motion of a single point
1.3 Position and Time
To describe motion, we need to know:
Where the object is: coordinate system, position, displacement, distance
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Document Summary
Motion: the (cid:272)ha(cid:374)ge of a(cid:374) o(cid:271)je(cid:272)t"s positio(cid:374) (cid:449)ith ti(cid:373)e. Trajectory: the path along which the object moves. Translational motion: linear, circular, projectile in which the object moves through space. Circular motion motion around the a centre. Rotational motion: (cid:272)hange of the o(cid:271)je(cid:272)t"s angular position. Rotational motion rotates on its own axis. Motion diagram: (cid:272)o(cid:373)posite photo sho(cid:449)i(cid:374)g a(cid:374) o(cid:271)je(cid:272)t"s positio(cid:374) at se(cid:448)e(cid:396)al e(cid:395)ually spa(cid:272)ed i(cid:374)sta(cid:374)ts of time. An object that has a single position in a motion diagram is at rest. Images that are equally spaced indicate an object moving with constant speed. An object with images that have increasing distance between them is speeding up. An object with images that have decreasing distance between them is slowing down. A more complex motion shows aspects of both slowing down and speeding up (ie: throwing a ball from center court) Particle: an object that can be represented as a mass at a single point in space.
