Answer:
I is the moment of inertia which is a scalar
w is the angular velocity
Explanation:
Kinetic energy has the Formula
K = ½ m v²
if the system is rotating, the linear velocity is related to the angular velocity
v = wr
we substitute
K = ½ m w² r²
K = ½ (m r²) w²
If we consider the body as punctual
I = m r²
we substitute
K = ½ I w²
we can see that
I is the moment of inertia which is a scalar
w is the angular velocity
K is called the rotational kinetic energy
