The+Good,+The+Bad,+and+The+Ugly

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(1:10-1:25) The scene in the movie Speed where the bus jumps a bridge that is out, is a gross example of ugly physics. Not only, would a bus completely fall apart after executing such a huge jump there is no way it could even get that far. During the clip the bus is in the air for approximately 8 seconds. Since all objects light or heavy fall at the same rate we can use the equation y=v*t+(1/2)a*t^2 to find out how far the bus would have dropped. V=0m/s t=8s a=-9.8m/s^2 y=0*8+(1/2)*-9.8*8^2 y=-627.2m Obviously the highway isn't 200 stories above the ground so this movie clip is extremely flawed.

__﻿Bad Physics__
media type="youtube" key="UtlMgwCsPTg" height="349" width="425" (1:10-1:11) This clip of the move Last Man Standing demonstrates bad movie physics when Bruce Willis's character shoots the man and he flys back through the window. This scene demonstrates bad conservation of momentum because a bullet wouldnt have enough momentum to send a man flying six feet backwards and through a window. Suppose the bullet, a .45 ACP in this case, weighs 10 grams (.01kg) and has a velocity of 259.1 m/s which is typical of the gun shown in the clip. The barrel of the gun in the scene measures to about 10 cm (.1m) using the equation t=v/d we find the time it takes for the bullet to exit the barrel to be 0.00038 s.If we divide the velocity by the amount of time the bullet takes to exit the barrel we can find the acceleration of the bullet. We find the acceleration to be 4025.6m/s^2. If we assume all of the momentum is transferred from the bullet to the man getting shot, which is highly unlikely, we can use the conservation of momentum equation to find how fast the man would accelerate backwards after getting hit. If we assume the man's mass to be 70kg we can set up the equation M1A1=M2A2. We know the mass of the bullet, M1, to be 0.01 kg and the acceleration of the bullet, A1, to be 4225.6m/s^2. Since we know M2 to be 70 kg we can rearrange the equation to find A2 to be, A2=M1A1/M2. Once we plug in the numbers and do our calculations we find A2=0.575m/s^2. This would mean that in the best conditions possible the man getting shot would fly back 0.5 meters, hardly enough to put a man through a glass window.

__﻿Good Physics__
media type="youtube" key="Sv1niwxQgoY" height="349" width="560" Now the movie Pearl Harbor isn't know for being historically accurate but the physics that are shown after the first torpedo is dropped are good. You can see the plane traveling very fast as it drops the bomb. When the bomb enters the water it experiences a greater coefficient of fricition than it had in the air so the torpedo slows down. Right before the torpedo hits the ship you can see it traveling a lot slower than it had when the it was released from the plane.