# Coriolis Force on a Rotating and Inclined Plane

## Homework Statement

I'm having a lot of trouble figuring this one out:

Study the trajectory of a free particle of mass M released from a state of rest on a
rotating, sloping, rigid plane. The angular rotation rate is Omega, and the
angle formed by the plane with the horizontal is alpha . Friction and the centrifugal force
are negligible. What is the maximum speed acquired by the particle, and what is its
maximum downhill displacement?

I attached a figure which shows what's going on, for clarification.

## Homework Equations

The relation between absolute and relative velocities is as follows:

U = u - OMEGA*y
V = v + OMEGA*x

where U and V are the absolute velocities in the absolute X and Y directions, respectively; u and v denote the velocities in the rotating x and y frames. For unforced motion, the above simplify to:

u - OMEGA*y = 0
v + OMEGA*x = 0

## The Attempt at a Solution

I'm having a lot of trouble accounting for the fact that the y-axis is not orthogonal to either the x axis or the axis of rotation. I've tried accounting for that by defining a new y-axis, y' which is orthogonal, but the math is blowing up. The motion should be forced only by gravity, but I'm having no luck with the following:

-M*g*sin(alpha) = M*du/dt - fv

It works out via system of linear ordinary equations (by my math) to:

d^2v/dt^2 + f^2v +g*f*sin(alpha) = 0

Which seems far more complicated that it should at this level. Thanks in advance for any help!

## The Attempt at a Solution

#### Attachments

• CoriolisFigure.png
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