Would you rather be hit by a 300lb heavy bag, or a Mini Cooper going 5mph?

http://espn.go.com/video/clip?id=5116722

 

Is the bag only 5mph as well or is there something missing from the equation. If they're moving the same speed then of course the bag would be less damaging but get that bag moving and wow that could easily hurt.
F=M*A

 

The bag must be moving faster 'cause they say the momentum of the bag is equivalent to a MINI moving at 5 mph.

 

Yeah, looks like they are right--- if the MINI is 2500 lbs, then the bag at 300 lbs has to be moving at ~ 40 mph to have the same momentum as the MINI at 5 mph.

The bag had about 1.5 secs to fall, which means it was traveling at around 15 meters/sec or around 40 mph.

 

Well then, assuming the same total impact force, the bag would hurt much more because it's probably smaller than the mini so the force would be delivered on a smaller surface area. I can't see the video so I may be stating things already in the video.

 

OMG, I'd rather get hit by the bag AND a MINI versus Bruce Campbell.

 

I'm with silhouette88, I don't want anything to do with Bruce Campbell, the MINI and the bag don't have lethal forearm to scramble your brains. He scared me.

 

Dang, I was really hoping to see him stop the MINI...

 

It was a really good video and thanks for sharing it. I would not want to run into Bruce Campbell with a Mack Truck let alone my JCW Mini Cooper.

 

In the video, Campbell is using his hands/arms to stop the bag, which he would presumably use to stop the MINI. So, same surface area (hands or arms) in either case.

 

but the bag has 8 times the kinetic energy. Go with the car. (proof is left as a excersize for the "students"!)

Matt

 

Nice video!!! Don't worry about Bruce Campbell people. Remember, it's Chuck Norris who'll kill you!!!!

 

Good point doc. For the MINI to have the same kinetic energy as the bag it would have to be moving at around 14 mph. Damn, makes Campbell's feat even more impressive.