Power Back: Contact Balance & Tackle Break Lab

Rusher Physics & Defensive Box

Play Scenario & Matchup PRESET

Back Weight (Mass) 247 lbs (112 kg)

Heavy backs preserve linear momentum through glancing contact.

Center of Gravity / Pad Level Low Leverage (0.34m)

Lower shoulder height wins the collision lever against upright tacklers.

Leg Drive & Contact Balance 96 / 100

Determines recovery velocity after absorbing shoestring & arm wrap attempts.

Defensive Box Pursuit Aggression 8 Men (High Angle Flow)

Number of pursuit defenders scraping toward the ball carrier.

1ST & GOAL • GB 4 YD LINE

CONTROLS: [CLICK / DRAG] OR [ARROWS] TRUCK: [SPACE / TRUCK]

Yards After Contact 0.0 YDS First Hit: -- YD

Tackles Shed / Broken 0 DEF 0 Trucks • 0 Arm Breaks

Peak Collision Force 0 N Momentum: 0 kg·m/s

Play Result READY TO SNAP Expected EPA: +0.00

Select a back build, steer the runner across the goal line, and use Truck Stick to power through defenders.

The Newtonian Physics of "Nobody Was Stopping Him"

1. Conservation of Linear Momentum ($p = m \cdot v$) A 247-pound running back traveling at 7.8 m/s carries ~873 kg·m/s of forward momentum. When a 198-lb defensive back attacks at an angle, the collision impulse requires massive eccentric neck and core deceleration to halt forward progress.

2. Pad Level & Angular Torque Lever By dropping pad level to 0.34 meters off the turf, the ball carrier minimizes the moment arm available to tacklers. High tackles transfer negligible rotational torque to the runner's center of mass, converting tackle attempts into glancing blows.

3. Continuous Ground Force Application Tackle resistance is not a static collision—it is work performed over distance ($W = \int F \, dx$). Elite contact balance backs never stop driving cleats into the turf, continuously exerting 1,800+ Newtons of ground reaction force throughout contact.