The TRUTH About Cybertruck Frame / Hitch Snapping In Half! (Bearded Tesla rebuts WhistlinDiesel)

[TyPope]

F = ma. g = 32 ft/s^2. How high up was he again? LOL

Call it 4 feet.
Going about 16 miles per hour or 7.15 meters per second.

3,000 pounds hitting something at 16 miles per hour exerts 9,730 pounds of force.

Calculations are all over the place depending on how high, how much weight is in the rear, etc.
Here, I assumed 3,000 lbs falling 4 feet.

Sponsored

 

[mongo]

F = ma. g = 32 ft/s^2. How high up was he again? LOL

Potential energy = mass*height*gravity
Impact force = energy/impulseDistance
Distance = rate*time so 1/10 the distance is 1/10 the time is 10x the acceleration to return to zero velocity.

If the impact duration is one tenth of the drop time, the force required is 10 times gravity i.e. 10x vehicle weight (really 11x to also offset gravity). If 1/20th the time, then 20x.

Compare catching a baseball vs holding your hand against a brick wall and having the ball thrown at it.

 

[REM]

Potential energy = mass*height*gravity
Impact force = energy/impulseDistance
Distance = rate*time so 1/10 the distance is 1/10 the time is 10x the acceleration to return to zero velocity.

If the impact duration is one tenth of the drop time, the force required is 10 times gravity i.e. 10x vehicle weight (really 11x to also offset gravity). If 1/20th the time, then 20x.

Compare catching a baseball vs holding your hand against a brick wall and having the ball thrown at it.

Your armchair internet engineer comment was spot on lmao. I don't understand why physics is such a mystery to most people.

 

[igs]

Call it 4 feet.
Going about 16 miles per hour or 7.15 meters per second.

3,000 pounds hitting something at 16 miles per hour exerts 9,730 pounds of force.

Calculations are all over the place depending on how high, how much weight is in the rear, etc.
Here, I assumed 3,000 lbs falling 4 feet.

3x is nowhere near the "more than that" 100x the internet engineer @HaulingAss thinks it is.

 

[mongo]

Call it 4 feet.
Going about 16 miles per hour or 7.15 meters per second.

3,000 pounds hitting something at 16 miles per hour exerts 9,730 pounds of force.

Calculations are all over the place depending on how high, how much weight is in the rear, etc.
Here, I assumed 3,000 lbs falling 4 feet.

That's not right
4 feet =1.2192m
H=1/2*a*t² +v*t
a=9.8m/s², v=0
t=sqrt(2*1.2192/9.8) = 0.5 seconds
0.5 s * 9.8 m/s² = 4.9 m/s
4.9 m/s = 11 MPH
Kinetic energy = 1/2*m*v²
m = 1500kg
Ke = 1/2*1500*4.9² = 18kJ
Which is the save as the inital potential energy
Pe= h*m*g = 1.1292*1500*9.8 = 18kJ

Now the critical part, how much force to stop it?
A Joule is 0.7376 foot*pounds
18kJ = 13277 lb*ft
So stopping it evenly over a distance of 1 foot requires over 13 thousand pounds of force
Over two inches requires 80 thousand pounds of force.
The block didn't move...

As a check, stopping it over 4 feet requires 3319 pounds which is the original weight (ignoring rounding errors). Note, we need to counter gravity also, so it really takes double the weight to stop it in four feet.

 

[CyberGus]

Is there a quiz on this later? I sorta skimmed all the maths

 

[igs]

The block didn't move...

According to your logic that requires infinite force.

 

[Outdoors]

If I need the math/physics wizards on the compound in the end days I know where to look. Here.....this thread.

 

[CyberGus]

According to your logic that requires infinite force.

 

[Gundo]

Maths > FUD

Thank you.

If the casting and hitch are truly weak links, we’d have many examples of failure already. We have none. The CT fleet has many miles driven with trailers.

And yes, we are taking the bait. Does anyone realistically think the parts of his video on the digital cutting room floor don’t tell a different story?

Those outtakes and cuts tell a story that favors the CT all day long. I mean the windows on the F150 cracked when the doors were slammed. Wtf.

 

[igs]

I dropped my pencil on an immovable concrete block. Infinite force to stop it! ?

 

[HaulingAss]

I dropped my pencil on an immovable concrete block. Infinite force to stop it! ?

You should refrain from commenting on things you know nothing about. It's like you are participating just to stir the pot and show off your ignorance.

 

[mongo]

According to your logic that requires infinite force.

Yep, if the block didn't move and the frame didn't bend and both materials were completely incompressible, infinite force would be required.
Thankfully this was not the case and the impact only had high force loads versus compressing matter into a singularity which would then have consumed the Earth followed by the Solar System, Milky Way, and the rest of the known universe.

Block not moving was meant to clue the reader to the concept that the displacement was at the sub inch level and thus 100k pounds was not an impossible value.

See also: sonoluminescence

 

[CarMan ElecTruck]

I would chalk it up to a fluke… somewhat.. we can all see the tail hitting the concrete tubes and other abuse to the rear. (Which the F150 also experienced, maybe) but the spike when the F150s front tires snagged the ditch when being pulled by the CT.. this is not an uncommon occurrence when towing… it happens..

however, I would hope Tesla looks closer at the design holistically for any potential ‘overlooked’ stress risers local to the area where the separation happened.. clean cut all the way across uniformly..

$0.02

Sponsored