This clip demonstrates the effects of the Coriolis and Centrifugal forces, by viewing various scenes from both rotating and stationary cameras. (The Coriolis force is also known as the Coriolis eff...
This clip demonstrates the effects of the Coriolis and Centrifugal forces, by viewing various scenes from both rotating and stationary cameras. (The Coriolis force is also known as the Coriolis effect).
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The first example shows a cannon fixed to a rotating disc. The cannonballs fly in straight lines since once shot no force acts on them. When this scene is viewed from the disc's frame of reference (i.e., as would be seen by a viewer that stands on the disc) the cannonballs seem to fly in a curved path. This demonstrates that in a rotating frame of reference one must take into account the Coriolis and Centrifugal forces. (Read more about them in Wikipedia: http://en.wikipedia.org/wiki/Centrifu..., http://en.wikipedia.org/wiki/Coriolis...
The second example shows a pendulum swinging over a rotating disc. A pendulum swinging through a small angle approximates what is called "harmonic motion" in which the ball is pulled to the center by a force proportional to its distance to the center. In the pendulum, the string exerts a force whose vertical component balances gravity and the horizontal component (shown in the clip) causes the harmonic motion (approximately). The disc and the pendulum has the same period, meaning both complete a cycle at the same time.
When viewed from the disc's frame of reference the centrifugal and Coriolis forces appear yet again. This time the centrifugal force balances the string's horizontal component. This is because the centrifugal force is also proportional to the distance from the center but pushing outward instead of inward. The equal periods make the factor of proportion the same for both. This leaves the Coriolis force alone to act on the ball. Since it is always perpendicular to the object's path, this creates a perfectly circular path.
Finally, we decrease the pendulum's period to be 2/3 of the disc's period. Now the centrifugal force no longer balances that of the string and the motion becomes more complicated.
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Im still not clear on what centrifugal force is, i need a simple explanation. Im doing a 10th grade science fair project,and im thinking about testing the effects of centrifugal force on seed germination of seeds. Just if someone could explain it, it would be a great help! :D
The centrifugal force like Coriolis force is an imaginary force. If you anaylze a system from a rotating frame of reference the usual physicals with its real forces such as the centripetal force will not suffice to explain what you see. Adding these two imaginary forces will fix that.
(Or maybe I was just stupid. What I just described was the "ball with effect" as so called in Brazilian soccer, which shifts to one side. However, a ball "dipping down" is simply -- gravity. Is it?)
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this is very helpful.
Im doing a 10th grade science fair project,and im thinking about testing the effects of centrifugal force on seed germination of seeds. Just if someone could explain it, it would be a great help! :D