Swinging momentum balls

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Center of Aerodynamic Pressure. The point on a rocket where stability-restoring forces due to airflow against the back part of the rocket fins, etc. The location of this point depends on the rocket's orientation at the time of measurement. If it is at a very small angle to the "local wind" line of flight , the fins' restoring contribution will be large, while the nose's disturbing contribution will be small, resulting in a CP that is way back. The CP in this case can be located using the Barrowman Equations. If the rocket is nearly sideways, the CP will be much more forward.

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Newton's cradle

Swinging Desk Balls | Design Gallery

Research the relationship among the centripetal force, frequency and radius of uniform circular motion. Use a 15 cm length of glass, inner diameter 1 cm. Burn its end over Bunsen burner into round and smooth. Twine two layers plastic adhesive tape or list on the surface of the glass to prevent the glass slip from your hand.

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Swinging Desk Balls

When the fifth ball begins accelerating, it is receiving momentum and energy from the third and fourth balls through the spring action of their compressed surfaces. For identical elastic balls of any type with initially touching balls the action is the same for the first strike, except the time to complete a collision increases in softer materials. This separates the balls, but they come back together just before as the fifth ball returns. This is due to the pendulum phenomenon of different small angle disturbances having approximately the same time to return to the center. When balls are "touching" in subsequent collisions is complex, but still determinable by this method, especially if friction losses is included and the pendulum timing is calculated exactly instead of relying on the small angle approximation.

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