1Chapters 9 and 10: Rotational MotionWe’ve considered the physics of the motion of particles, and the motion of the center of mass of extended objects.But extended objects can also rotateabout an axis.Rotation and anglesThink about a rigid bodythat rotates about a fixed axis. First, we need to sort out a better ‘unit’ for anglesWe’ve been using degrees[0:360], but there is a better ‘unit’ we can use called radians1 radian is defined as the angle subtended at the center of a circle by an arc with length equal to the radius of the circleall round the circle,1 rad = 57.3oAngular velocityDefine an angular velocityas the rate of change of an angleunits are radians/secondwho has the larger angular velocity, the boy or the girl? boygirlAngular accelerationDefine an angular accelerationas the rate of change of the angular velocityunits are radians/second2
has intentionally blurred sections.
Sign up to view the full version.