# How does torque affect rotational motion?

Torque plays the same role in rotational motion that force plays in linear motion. Through Newton'a Second Law you know that force $F$ acting on a body of mass $m$ produces (linear) acceleration $a$ according to:
$F = m a$
In the same way a net torque $\tau$ acting on a body of moment of inertia $I$ causes it to undergo the angular acceleration $\alpha$ as:
$\tau = I \alpha$