High speed crashes

[Tedronai]

Given that a weapon:5 attack is substantially more deadly than a fragmentation grenade, I really don't think that making collisions significantly more deadly would contribute to their consistency with the rest of the system.

[ARedthorn]

mmm... you might have a point. That said- Weapon:5 still seems a bit light for a 2+ ton truck at 60mph, even if it is comparable to a frag grenade (yes, yes, a normal person is pudding either way- but we have to worry about a lot more than normal people in this system, so degrees of pudding matter). Maybe solvable with something more along the lines of aspects... the frag grenade affects a whole zone, the mack truck gets a "Squish" aspect or summat.
Now, a regular car hitting someone at 60mph... that I could agree with for Weapon:5, using the frag as a benchmark for comparison.

[Tedronai]

A frag grenade is weapon:4.  It can easily shred handfuls of normal humans (aka 'mooks' without the plot armour of Consequences), even those wearing modest armour.  Weapon:5 is substantially more deadly than even that, and might be something of a stretch for a 'regular car' at anything short of absurd speeds.  This is the territory of anti-material rifles, 'claymore' mines, and shaped charges.

[ARedthorn]

Whereas I can't get over the raw amount of energy involved. I'm a physicist, and regardless of anything else- my brain stops working once I've done the math on a ton of steel moving at 60 mph.
Would you rather get hit by a ping-pong ball moving at the speed of sound, or a 8lb bowling ball moving at 21mph?
Unless you have a preference in bruise sizes (best case scenario) or between broken bones and holes (worst case), it really doesn't matter.
Speed matters a lot more than mass, but mass still does the trick just fine.