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Level 90

Kinetic Energy of Rotation


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Rotational Inertia (I)
I=SUM Mi x Ri^2. how difficult it is to get an object to rotate. units=kg x m^2
Kinetic Energy equation
K.E. = 1/2(MM)u^2
hoop: I=MR^2
for continuous objects of uniform density...
Ia=Icom+mh^2
Parallel axis theorem
torque is rotational force
T=magnitude F x magnitude R sin theta (dont forget the sign!)
magnitude/angle
magnitude C=magnitude A x magnitude B sin theta
conservation of mechanical energy
if we are considering gravity, Ki+Ugi=Kf+Ugf
constant torque
means constant acceleration (just like constant force=constant acceleration!)