
69
B
rainstorming
B
rainstorming
A Newton’s cradle is a device which consists
of five identically-sized steel balls suspended on
a metal frame. The steel balls are touching each
other at rest. This limits the movement of the steel
balls in a one-dimensional elastic collision. Therefore, if you
were to lift up the right-end ball and release it freely, it will strike
the second ball beside it. Because every steel ball’s mass is the
same, the first ball stops and transmits its energy to the second one. Now the
second ball has the same speed that the first ball had before striking. Because
the second ball touches the third ball, the same elastic collision as before
happens again. When the energy transmits to the left-end ball, the ball swings
upward. When the left-end ball strikes back, the same sequence happens
again. Only the end-balls swing. The balls in the middle stay still.
Can you feel the impact from the other side of the wall?
Daily
Application
Daily
Application
After school, Tony and his friends went to play billiards together. This was
Tony’s first time playing. After seeing his friends continuously knocking balls
into the corner pockets, Tony felt like a loser. It seemed that he couldn’t get the
technique down right.
Tony’s friend told Tony that in order to hit the a ball into one of the pockets,
you have to imagine the hit-point of the cue ball first. Then, you must predict
the trajectory of the target ball after it
gets hit by the cue ball. Basically, you
can assume a two-dimensional strike; the
striking angle and force of the cue ball will
decide the direction and distance the target
ball will travel. After their explanation, Tony
finally understood the trick behind playing
billiards.
Kids, now that you understand the
principles of elastic collision, try building a
buffer track and test it by colliding balls!
18
Buffer Track
Scientific
Application
Elastic Collision
Содержание 1249R
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Страница 8: ...7 7 9 8 1 1 Skyscraper Done...
Страница 11: ...10 1 5 2 6 4 3 Parts List 12 x1 28 x1 39 x6 43 x10 35 x2 3 x1 27 x1 22 x1 2...
Страница 12: ...11 Model Operation Video 7 2 Rotating Tower Done...
Страница 15: ...14 3 2 4 1 Parts List 36 x8 41 x2 40 x4 39 x6 43 x6 35 x1 2...
Страница 16: ...15 5 3 6 U Shaped Track Model Operation Video Done...
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Страница 20: ...19 Model Operation Video 7 9 8 4 Rising Dominos Done...
Страница 23: ...Winner 22 Design Concept My Artwork 2 1 3 Model Design Model Creation Winner Evaluation...
Страница 25: ...24 1 5 3 2 4 Parts List 150mm 26 x1 22 x2 x4 1 2 x8 16 x3 19 x2 4 x2 11 x1 12 x2 13 x2 39 x3 41 x1 43 x4 35 x1...
Страница 29: ...28 1 5 3 2 6 4 Parts List 2 x5 16 x4 24 x1 31 x1 30 x1 17 x2 13 x6 15 x1 36 x8 38 x4 29 x4 35 x2 Back view 4...
Страница 30: ...29 7 9 8 10 7 70m m Pitching Machine Model Operation Video Done...
Страница 33: ...32 70mm Parts List 28 x5 39 x7 43 x6 35 x1 5 3 7 2 6 x2 1 16 x2 24 x1 11 x1 12 x4 13 x1 4 x1 9 x1 4 1 6 2...
Страница 34: ...33 8 8 Pendulum Pitching Machine Model Operation Video Done...
Страница 38: ...37 9 11 12 10 Pinball Model Operation Video Done...
Страница 41: ...Winner 40 Design Concept My Artwork 2 1 3 Model Design Model Creation Winner Evaluation...
Страница 44: ...43 11 7 8 100mm Gravity Pick Machine Model Operation Video Done...
Страница 47: ...46 Parts List 42 x4 43 x9 17 x4 36 x8 37 x1 39 x7 41 x6 35 x4 40 x6 5 3 2 6 1 44 x3 2 4 3...
Страница 48: ...47 12 9 10 7 8 Spiral Roller 3...
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Страница 50: ...49 12 13 Spiral Roller Model Operation Video Done...
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Страница 54: ...53 13 5 7 6 Bifurcated Track Model Operation Video Done...
Страница 61: ...Winner 60 Design Concept My Artwork 2 1 3 Model Design Model Creation Winner Evaluation...
Страница 68: ...67 17 9 8 Going Through the Wall Model Operation Video Done...
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Страница 72: ...71 18 7 8 Buffer Track Model Operation Video Done...
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Страница 76: ...75 19 7 8 Peacock Model Operation Video Done...
Страница 79: ...Winner 78 Design Concept My Artwork 2 1 3 Model Design Model Creation Winner Evaluation...
Страница 80: ...79 MADE IN TAIWAN 2018 Genius Toy Taiwan Co Ltd ALL RIGHTS RESERVED R21 1249R...