ROTATIONAL MOTION

less area, less friction

rolling requires static friction

                        less energy lost to friction

sliding requires kinetic energy - more energy lost to friction

ANGULAR VELOCITY - how fast something spins or rotate

w=0/t

ANGULAR ACCELERATION - how fast or slow the spinning is changing

TANGENTAL - The linear velocity turning around the center

• how fast a point in the edge is

TANGENTAL VELOCITY - vt= wr

• m/s

TANGENTIAL ACCELERATION - at=ac r

• m/s²

at = tangential acceleration

r = raidus

ac = angular acceleration

meters to radian: rad = length/ raidus

KINEMATICS

1. ANGULAR POSITION

2. ANGULAR DISPLACEMENT

3. ANGULAR VELOCITY

ANGULAR POSITION 0 - orientation of an object undergoes rotational motion

Position - how far an obeject is rotated from a reference point

• measured in degree

• ex. fan blade

ANGULAR DISPLACEMENT - change in position

• how far a object is rotating from where its placed

• measured in radius or degrees

• 0= 0f- 0i