The forehand drive is the most fundamental and powerful shot in squash, involving a sequential kinetic chain that maximizes racket head velocity. 

The Kinetic Chain: Shoulder → Elbow → Wrist 
Force generated from the lower body transfers through trunk rotation to the shoulder, then elbow, then wrist. Each joint accelerates sequentially, and the racket head velocity is the sum of all these rotational contributions. This is the physics behind the coaching cue 'use your arm like a whip.' 

Energy Transfer 
The racket-ball collision is never perfectly elastic. Some kinetic energy is inevitably lost to ball deformation, sound, and heat. Both translational kinetic energy (from the racket's linear speed) and rotational kinetic energy (from the wrist snap) contribute. Striking at the sweet spot with proper face angle minimizes these losses. 

The Sweet Spot: Center of Percussion The sweet spot is where the impulsive reaction force at the grip vanishes upon impact. At the Center of Percussion, the ball's impact produces pure rotation about the hand with no translational jolt transmitted to the grip. Its distance from the grip depends on the racket's moment of inertia, total mass, and center of mass location.