Projectile Human
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The first scene of bad physics that will be analyzed occurs shortly after Captain Sparrow makes his escape from Norrington and his troops at the dock. After stealthily getting past patrols, Jack finds himself in a blacksmith shop, owned by Will Turner’s master, Mr. Brown. Once inside Captain Sparrow is tasked with the problem of breaking free of his handcuffs, put on him by Norrington. Following a variety of techniques and tools, Jack finally breaks the chain, but it is at this moment Will steps into the shop. Captain Sparrow quickly darts for the shadows to hide from him. While walking around the shop Will notices something odd about the setting. Tools have been misplaced and a hat which he’s never seen before is sitting on an anvil. Captain Sparrow decides to show himself to Will only to be challenged to a duel. Many sword clashes later the men find themselves teetering on a cart in the shop (3:10).
Jack then wraps what remains of the chain on his cuffs around one of Will’s swords, Will in response jams the wrapped sword into a rafter above Jack’s head. Jack then steps on a lose board on the cart throwing Will off balance and causing him to fall. As Will is getting up, Jack attempts to get the sword out of the rafter by inverting himself and pulling on the sword.
As Will steps on to the cart the sword is made free of the rafter and Jack begins to fall. Once he hits the cart, Will, who is on the other end is pushed up by Jack’s momentum into the rafters above where the fight continues (motion can be viewed at 3:35 to 3:42). When examined, Will’s motion is impossible as he does not have enough velocity to travel the distance to the rafters above, making this scene incorrect or “bad physics”.
When measured it is noted that the distance from Will’s feet on the cart to the rafters is 4.3m or 169 inches, a considerably great height given the situation and motion. The time it takes Will to reach the rafter above his head is measured to be 0.4 seconds. Will also leaves the cart with an initial vertical velocity of 8.27 m/s and immediately starts slowing down as the force of gravity is acting against him, causing his acceleration to be -9.8m/s^2. In order to find the maximum distance Will can travel given the following statistics, a calculation must be made. In this case we will be using the equation d=1/2at^2+Vit.
dphoto=4.3m dmax(y)=1/2at^2+Viyt
dmax(y)=? = ½(-9.8)(0.4)^2+(8.27)(0.4)
t=0.4s dmax(y)= 2.52m
Viy=8.27m/s
a=-9.8m/s^2
From the following calculation it can be determined that from the forces Jack applies on the other end of the cart are only enough to supply Will with enough vertical velocity to travel 2.52m into the air, causing him to be 1.78 meters short of the rafter. Therefore, it can be assumed that Orlando Bloom or his stunt double is being hoisted up by a wire in order to reach the rafter. In reality Will would travel the 2.52 meters into the air, only to fall back the 2.52 meters to the ground as he would not have the momentum to carry him the distance the movie suggests.
Jack then wraps what remains of the chain on his cuffs around one of Will’s swords, Will in response jams the wrapped sword into a rafter above Jack’s head. Jack then steps on a lose board on the cart throwing Will off balance and causing him to fall. As Will is getting up, Jack attempts to get the sword out of the rafter by inverting himself and pulling on the sword.
As Will steps on to the cart the sword is made free of the rafter and Jack begins to fall. Once he hits the cart, Will, who is on the other end is pushed up by Jack’s momentum into the rafters above where the fight continues (motion can be viewed at 3:35 to 3:42). When examined, Will’s motion is impossible as he does not have enough velocity to travel the distance to the rafters above, making this scene incorrect or “bad physics”.
When measured it is noted that the distance from Will’s feet on the cart to the rafters is 4.3m or 169 inches, a considerably great height given the situation and motion. The time it takes Will to reach the rafter above his head is measured to be 0.4 seconds. Will also leaves the cart with an initial vertical velocity of 8.27 m/s and immediately starts slowing down as the force of gravity is acting against him, causing his acceleration to be -9.8m/s^2. In order to find the maximum distance Will can travel given the following statistics, a calculation must be made. In this case we will be using the equation d=1/2at^2+Vit.
dphoto=4.3m dmax(y)=1/2at^2+Viyt
dmax(y)=? = ½(-9.8)(0.4)^2+(8.27)(0.4)
t=0.4s dmax(y)= 2.52m
Viy=8.27m/s
a=-9.8m/s^2
From the following calculation it can be determined that from the forces Jack applies on the other end of the cart are only enough to supply Will with enough vertical velocity to travel 2.52m into the air, causing him to be 1.78 meters short of the rafter. Therefore, it can be assumed that Orlando Bloom or his stunt double is being hoisted up by a wire in order to reach the rafter. In reality Will would travel the 2.52 meters into the air, only to fall back the 2.52 meters to the ground as he would not have the momentum to carry him the distance the movie suggests.