Newton Rotational IThe rotational principle of inertia: In the absence of a net applied torque, the angular velocity remains unchanged.
Newton Rotational IIτ = I αThis is not as general a relationship as the linear one because the moment of inertia, I, is not strictly a scalar quantity. The rotational equation is limited to rotation about a single principal axis, which in simple cases is an axis of symmetry.
Newton Rotational III For every applied torque, there is an equal and opposite reaction torque. (A result of Newton's 3rd law of linear motion.)
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