DISPROVED BY: ELAINE KOONTZ
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Transcript of DISPROVED BY: ELAINE KOONTZ
DISPROVED BY:ELAINE KOONTZ
Video Explanation• The Baudelaire’s are sitting in a car
on the railroad tracks• Their goal is to create a device to
reach and switch the tracks• They use a bobble head, conical
spring, and car seat material• The device springs the bobble head
around the switcher and, with enough force, switches the tracks
Physics Explanation
• Estimate distance for bobble head to travel
• Use Conservation of Energy formula to find velocity of spring launching bobble head
• Plug in velocity to find actual distance for bobble head to travel
• Reveal that the bobble head can not travel the distance with that mass and velocity
CalculationsEstimated distance from car window to
track switcher: d = 22.74 ft/ 6.9 mAverage time of bobble head to track
switcher: t = 1.65 secondsAverage/ estimated velocity of bobble
head:d = vt
6.9 = v(1.65)v= 4.18m/s
22.74 feet/ 6.9 meters
9 inches 12 inches9 inches x 13 ties + 12 inches x 13 gaps
CalculationsConservation of Energy Equation:
PEe + KEe = PEf + KEf
½ kx2 = ½ mv2
kx2 = mv2
Constant of spring (k):k = 25 lbs./in(1in./.254m)(.4536N)k = 446.5 N/m
Mass of bobble head: m = 12 oz./ .34 kg
CalculationsCompressed distance of spring (x):
x = 6 inches – 3 inches = 3 in./ .08 mActual velocity of bobble head:
kx2 = mv2
446.5(.08)2 = .34(v)2
2.86 = .34(v)2
√8.41 = (v)2
v = 2.9 m/s
6 inches
3 inchesx = 6 inches – 3 inches = 3 inch compression
m = 12 ounces
CalculationsActual distance bobble head would
launch:d = 2.9 m/s (1.65 sec.)
d = 4.8 metersDifference between actual and estimated:
estimated – actual = difference6.9 – 4.8 = 2.1 meters/ 6.9 feet
15.75 feet/ 4.8 meters
22.74 feet/ 6.9 meters
22.74 feet/ 6.9 meters
12 ounces
4.18 meters per second2.9 meters per second
References
• Railroad Ties: www.discoverlivesteam.com/magazine/69.html
• Spring: www.springteam.com/design.htm• Movie:
“A Series of Unfortunate Events” Paramount Pictures 2004
• Pounds to Force:Physics book, page 958
ConclusionIf the 12 ounce bobble head were to
be launched 6.9 meters, the head would have to be traveling at 4.18 meters per second. However, the head is only traveling at the rate of 2.9 meters per second. With a time of 1.65 seconds, the bobble head would reach 4.8 meters. Clearly, the bobble head would not reach the track switcher, subsequently disproving the movie.