If someone threw 4 bricks at your face, how bad would you get hurt?

Question

If someone threw 4 bricks at your face, how bad would you get hurt?

Answer 1

potential energy (U) is the stored energy of an object of m mass, relative to its position from the Earth's surface, where g is the acceleration due to gravity, and h is the altitude of the object. If m is expressed in kilograms, g in meters per second squared and h in meters then the potential energy U will be calculated in joules, or

U=mgh

assuming g=10 m/s^2,

m=2.7 kg

h=40 m, then

U=2.7*10*40=1080 J

for four bricks, total energy would be: 4*1080= 4320 Joules!, which is enough to smash a piece of steel!

Answer 2

Home Alone 2 Brick Scene

Answer 3

This Site Might Help You.



RE:

If someone threw 4 bricks at your face, how bad would you get hurt?

I'm doing a physics project where you have to find a scene out of a movie that's bad physics. Im doing a scene from Home Alone 2 where the little kid throws 4 bricks at this guy's face from the top of a building. The bad physics in that is that the guy got barely hurt; he fell down and...

Answer 4

sophisticated task. look on a search engine. just that may help!

Answer 5

I would end up dead before the 3rd brick nobody can survive being hit with bricks more than once.

Answer 6

As Ameer has answered, the bricks would each impart

U=2.7*40*10

U=1080 Joules of energy.



But did he manage to have all four bricks tied together and hit the fellow, or did he try for shotgun effect and only one hit him?



Did he just drop the, off the building, or did he throw them, giving the bricks more momentum?



Where did it hit the robbers? Was it in the top of the head where the hair would provide some give, or was it on the forehead, which is nice and hard?

You see, the energy of an object as it collides is divided by time period over which the collision occurs, determining whether it is a very large amount of force at once or a lower amount over some time. The steel bar Ameer mentioned has very little give, but it might not be so for the person.



Because of all these factors, it would probably be best to go, rather than with physics, experimentation and practical experience.

Answer 7

i think that was just a movie.

when you throw a brick from a good ht ,rather than force , impulse acts which is much many times greater that action of force. it is the product of force and small fraction of time in which it takes place.

so .rather ,collision time between the man and brick would be important , acc to me

Answer 8

well.. think about getting hit by something that is going 22 miles per hour..

Answer 9

could start with having broken bones in the face/nose, the face being lacerated and bloodied and bruised and probably the guy would also have been knocked out from a blunt object hitting him in the face at speed. just a few thoughts.

Answer 10

"Ameer" gave an amazing answer. Kudos to him ! :)



"Peter Griffin" is right too...from that height, broken bones, lacerations,...don't even want to think of it happening to any living being. Also bricks are really not necessarily "blunt objects". The one that hit me was very pointy, very sharp.



and "Kingbow1"...that's a valid point too, the bricks were dropped individually, not fused together as one object...and now beyond physics, practical experience ! A brick fell from 2 feet higher than my face and landed on my upper lip, ripped right through the skin and connective tissue to just inside the inner surface of my mouth, 1 inch left and right plus 1 inch vertical. Blood gushed out and filled the palm of my hand. That's just a short distance for the brick to fall, and I am certainly not a delicate dainty man, I am tall and tough like an NHL hockey player. The doctors who sewed me up in the emergency in hospital said I had very tough connective tissue, toughest they've ever encountered. That brick falling on me was an accident. If anyone throws a brick to hurt someone for any reason it should be considered by the Law as seriously as a gun.



Bricks in northern USA and Canada have compression strength of 6000 - 16000 PSI, so consider this in addition to the momentum, its weight and its speed after falling 40 metres, and some surfaces of the brick are sharp ! A brick falling 40 metres on someone's head would cause fractured skull and fatal physical damage to the brain, maybe also neck injury, lacerations, loss of blood, probably not survivable. Do not try it to find out. Do not do it.

Answer 11

this is a case of impact force. it is complicated to go into detail but lets see the basics.

the time of impact is usually very small say 0.02 seconds . depends on other factors

the brick falls on the man

now the impact force is given by impact force * time of collision = change in momentum

impact force = mv/impact time assuming the man absorbs all the enrgy and the surface of the man is not elastic for the brick to bounce up



so the impact force depends on the velocity of the brick when it hits the man

so if you drop it from a higher building, impact force will be greater since it hits with a higher velocity

similarly a heavier stone will also lead to a greater impact force.

increasing number of bricks will cause 4 different impacts on him and it may cause him more pain



now imagine you throw something which bounces off his head the change in momentum will be higher since it will be mv - (-mv1) since it bounces off the surface in the opposite direction



nowimagine the man and brick do not bounce, but he is moving up with a velocity and brick is falling down with a velocity, again the impact force will be higher. because the relative velocity is higher



the mass of the man will not affect the impact force i think

there is more

hope this helps,