tau = Ixalpha for an object rotating about a fixed axis, where \( \tau \) is the net torque acting on it, \( I \) is its rotational inertia, and \( \alpha \) is its angular acceleration. This expression
Correct answer: A. Follows directly from Newton's second law
- A. Follows directly from Newton's second law
- B. Is the definition of angular acceleration
- C. Is the definition of linear acceleration
- D. Is the definition of torque
Explanation
Newton's second law for rotational motion is \( \tau = I\alpha \), where \( \tau \) is the net torque, \( I \) is the rotational inertia, and \( \alpha \) is the angular acceleration
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Newton’s laws explain inertia, the relation between net force and acceleration, and action-reaction pairs. Questions involve free-body diagrams, balanced and unbalanced forces, F = ma, force as the rate of change of momentum, and identifying genuine third-law pairs, which act on different bodies.
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