physics ch 8

axis of rotation

points on a rigid object move on circular path

angular displacement

the angle through which the object rotates, is positive if it is counterclockwise and negative if it is clockwise, in radians

angular displacement equation

change in angular displacement= final angular displacement - initial angular displacement

something equation

average angular velocity equation and units

w= angular displacement/ time, units are radian per second

angular acceleration

occurs when angular velocity is changed

avg angular acceleration equation

a= change in angular velocity/ time, units are radian per second squared

equation to find final angular velocity

w= w0 +at

equation to find angular displacement with no acceleration

ang displacement= ½ (w0 +w)t

equation to find final angular velocity with no time

w²= w0² +2a x s

equation to find angular displacement with no final velcity

s= w0t +1/2 at²

tangential speed equation

Vt= r x w, in rad/s

tangenital accleration

At= r x a, units are rad/s²

Centripetal accleration equation

Ac= r x w², units are rad/s