The physical force is driving the clash behind the barrier. Having high base strength is very important.
Imagine two cars with an inflatable highly durable pressurised baloons in the front of it, going at 30mph clashing against each other
then imagine one gets 500kg loaded but have the speed/acceleration stay the same,
or one drives at 100mph,
or one gets more torque in the engine
Also Creating a bigger arm creates a bigger adv CoC barrier.
Imagine two cars with an inflatable highly durable pressurised baloons in the front of it, going at 30mph clashing against each other
then imagine one gets 500kg loaded but have the speed/acceleration stay the same,
or one drives at 100mph,
or one gets more torque in the engine
Also Creating a bigger arm creates a bigger adv CoC barrier.