Re:Tesla footage of braking before crash ahead [video]
by sytelus on Wednesday December 28, 2016 @09:14PM
(#13275253)
I was wondering how did SUV rolled because for that to happen you need force getting applied on car that is on Y axis (the +X axis being the forward direction) which will ultimately produce the torque causing the roll. After looking at video at low speed, here's how we got that force vector:
1. Hatchback hits on tangent producing torque and spinning SUV by 90-degree.
2. SUV collides with barrier which produces force vector that is normal to collision surfaces and slightly off forward direction.
3. The driver now seems to have pressed on breaks really hard which produces another force vector. But this vector is now quite off original forward direction because car had been rotating.
So the moral of the story is that if SUV is rotating and you press on breaks really hard, you will get roll. This is purely because SUV has higher clearance and so even small force can produce enough torque that will cause roll. It looks to me if driver hadn't pressed on breaks really hard, the rolls could possibly been avoided or reduced.
1. Hatchback hits on tangent producing torque and spinning SUV by 90-degree.
2. SUV collides with barrier which produces force vector that is normal to collision surfaces and slightly off forward direction.
3. The driver now seems to have pressed on breaks really hard which produces another force vector. But this vector is now quite off original forward direction because car had been rotating.
So the moral of the story is that if SUV is rotating and you press on breaks really hard, you will get roll. This is purely because SUV has higher clearance and so even small force can produce enough torque that will cause roll. It looks to me if driver hadn't pressed on breaks really hard, the rolls could possibly been avoided or reduced.