Rotational Motion Flashcards
What is arc length?
s = r thetha
What is angular displacement?
delta thetha = final - initial
What is angular velocity?
w = delta thetha / delta t
What is angular acceleration?
a = delta w / delta t
What is same for object rotating on fixed axis?
Angular velocity and acceleration.
Formulas for constant a?
w = wi + at
w2 = wi2 + 2a delta thetha
delta thetha = wit + 1/2at2
What is tangential velocity?
v = rw
What is tangential acceleration?
a = ra
What is centripetal acceleration?
a = v2/r = rw2
What is total acceleration?
Square root tangential acceleration2 + centripetal acceleration2
Convert revolution to rad.
1 revolution = 2 pi rad
What is torque?
T = rF = rF sin thetha
T = mr2a
If force applied counterclockwise, T is?
Positive
What are some facts about torque?
Increases angular acceleration
Not necessary to have physical rotation axis.
Value depends on chosen axis of rotation.
What is when object is in equilibrium?
Net external force = 0
Net external torque = 0
