Fictitious force | Wikipedia audio article
Channel: wikipedia tts
Date: 2018-12-25

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Fictitious_force


00:02:08 1 Background
00:03:05 2 Fictitious forces on Earth
00:04:14 3 Detection of non-inertial reference frame
00:05:39 4 Examples of fictitious forces
00:05:50 4.1 Acceleration in a straight line
00:08:55 4.2 Circular motion
00:12:30 4.3 Fictitious forces and work
00:13:27 5 Gravity as a fictitious force
00:14:23 6 Mathematical derivation of fictitious forces
00:14:35 6.1 General derivation
00:29:02 6.2 Rotating coordinate systems
00:40:27 6.3 Orbiting coordinate systems
00:42:12 6.4 Orbiting and rotating
00:49:11 6.5 Crossing a carousel
00:57:46 6.5.1 Inertial observer
00:59:20 6.5.2 Rotating observer
01:00:14 6.6 Observation
01:08:20 7 See also
01:13:36 8 Notes
01:14:26 9 Further reading
01:14:35 10 External links
01:14:44 Further reading
01:15:50 External links



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SUMMARY
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A fictitious force (also called a pseudo force, d'Alembert force, or inertial force) is an apparent force that acts on all masses whose motion is described using a non-inertial frame of reference, such as a rotating reference frame. Examples are the forces that act on passengers in an accelerating or braking automobile, and the force that pushes objects toward the rim of a centrifuge.
The fictitious force F is due to an object's inertia when the reference frame does not move inertially, and thus begins to accelerate relative to the free object. The fictitious force thus does not arise from any physical interaction between two objects (that is, it is not a "contact force"), but rather from the acceleration a of the non-inertial reference frame itself, which from the viewpoint of the frame now appears to be an acceleration of the object instead, requiring a "force" to make this happen. As stated by Iro:
Such an additional force due to nonuniform relative motion of two reference frames is called a pseudo-force.

Assuming Newton's second law in the form F = ma, fictitious forces are always proportional to the mass m.
The fictitious force on an object arises as an imaginary influence, when the frame of reference used to describe the object's motion is accelerating compared to a non-accelerating frame. The fictitious force "explains," using Newton's mechanics, why an object does not follow Newton's laws and "floats freely" as if weightless. As a frame can accelerate in any arbitrary way, so can fictitious forces be as arbitrary (but only in direct response to the acceleration of the frame).  However, four fictitious forces are defined for frames accelerated in commonly occurring ways: one caused by any relative acceleration of the origin in a straight line (rectilinear acceleration); two involving rotation: centrifugal force and Coriolis force; and a fourth, called the Euler force, caused by a variable rate of rotation, should that occur. 
Gravitational force would also be a fictitious force based upon a field model in which particles distort spacetime due to their mass, such as General Relativity.