The Physics of Rugby Tackling: Torque, Momentum, and the Art of Sam Underhill

Rugby tackling is an art, and when executed by athletes like Sam Underhill, it becomes a fascinating study of physics. Tackling involves a combination of torque, momentum, and precise biomechanical application. Let’s break this down and solve an actual problem that showcases how Underhill’s technique leverages the principles of physics to perfection.

Understanding Torque in Tackling

Torque (\tau) is the rotational force applied on an object. In rugby, when a tackler wraps their arms around an opponent, torque comes into play to destabilize the opponent’s center of gravity. The equation for torque is:

\tau = r \cdot F \cdot \sin(\theta)

where:

• r = the distance from the pivot point (center of gravity of the tackled player),

• F = the force applied,

• \theta = the angle at which the force is applied.

For effective tackles, torque is maximized by:

1. Hitting low: Tackling closer to the opponent’s legs increases the lever arm (r).

2. Driving through: Maximizing the force (F) applied.

3. Angle precision: Ensuring the force direction destabilizes the opponent’s balance.

Sam Underhill’s Signature Tackles

Underhill is renowned for his textbook-low tackles that bring down opponents…