Purpose: To observe and study the position, velocity and acceleration of an object moving in circular motion. Concepts: If an object goes around in clockwise direction, is this considered positive or negative? If the object goes around three quarters of a circle, what is this in degrees and in radiances? (Note: 2pi rads = 360 deg) degrees. radiances. Confirm that the following equations for tangential speed and centripetal acceleration are correct in terms of the angular speed w and the radius R: V = WR a = V/R