Types of Motion

1  Motion,  is the change of position of one body with respect to another. The rate of change is the speed of the body. If the direction of motion is also given, then the velocity of the body is determined; velocity is a vector quantity, having both magnitude and direction, while speed is a scalar quantity, having only magnitude.

2  Uniform motion is motion at a constant speed in a straight line.

2.1  Uniform motion can be described by a few simple (ha ha) equations. The distance s covered by a body moving with velocity v during a time t is given by s=vt.

2.2  If the velocity is changing, either in direction or magnitude, it is called accelerated motion.

2.3  Uniformly accelerated motion is motion during which the acceleration remains constant. The average velocity during this time is one half the sum of the initial and final velocities. If a is the acceleration, time is given as t,  vo the original velocity, and vf the final velocity, then the final velocity is given by vf=vo + at. The distance covered during this time is s=vot + 1/2 at 2. 

Don't worry about this kids!  I will demonstrate all these things for you.

3  Two types of simple uniform motion

3.1  The basic simple motions are:

3.1.1  Translation (motion along a path)

3.1.2  Each simple motion can occur and be described independently (for example, something can move along a path without rotating, it can rotate without moving along a path). Another convenient fact is that often (but not always), forces that affect one of the simple motions will not affect the others.

3.2  Rotation (circular motion about a fixed axis)

3.2.1  In the simplest circular motion the speed is constant but the direction of motion is changing continuously. The acceleration causing this change, known as centripetal acceleration because it is always directed toward the center of the circular path, is given by a=v2/r, where v is the speed and r is the radius of the circle.