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The Coriolis force.

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Presentation on theme: "The Coriolis force."β€” Presentation transcript:

1 The Coriolis force

2 For Visual learners Example using a ball on a carousel: You can try it in the park if you are a Kinematic learner Video from MIT

3 Relative acceleration between frames
π‘Ÿ = 𝑂𝑂′ + π‘Ÿβ€² Calculate the derivative: 𝑑 π‘Ÿ 𝑑𝑑 = 𝑣 , 𝑑 𝑂𝑂′ 𝑑𝑑 = 𝑣 0 𝑑 π‘Ÿβ€² 𝑑𝑑 = 𝑑 𝑑𝑑 π‘Ÿ β€² π‘Ÿ β€² = π‘‘π‘Ÿβ€² 𝑑𝑑 π‘Ÿ β€² + π‘Ÿ β€² 𝑑 π‘Ÿ β€² 𝑑𝑑 The first term is π‘‘π‘Ÿβ€² 𝑑𝑑 π‘Ÿ β€² = 𝑣′ The second term exploits the Poisson formula π‘Ÿ β€² 𝑑 π‘Ÿ β€² 𝑑𝑑 = π‘Ÿ β€² πœ” Γ— π‘Ÿ β€² = πœ” Γ— π‘Ÿβ€² Therefore: 𝑣 = 𝑣 0 + 𝑣′ + πœ” Γ— π‘Ÿβ€² Similarly the acceleration can be derived to be π‘Ž = π‘Ž 0 + π‘Žβ€² + πœ” Γ—( πœ” Γ— π‘Ÿ β€² )+ 𝑑 πœ” 𝑑𝑑 Γ— π‘Ÿβ€² +2( πœ” Γ— 𝑣′ ) P π‘Ÿ O π‘Ÿβ€² O’

4 Camera fixed in the lab, no forces, linear motion
Camera fixed to the rotatory system, fictitious force, parabolic trajectory

5 Coriolis force Pressure Low

6 Credits: NASA/JPL/Space Science Institute


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