Phys205A_Lecture15

# Physics for Scientists & Engineers with Modern Physics (4th Edition)

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Chapter 6 Motion in Accelerated Frames Lecture 15

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Motion in Accelerated Frames z A fictitious force results from an accelerated frame of reference z A fictitious force appears to act on an object in the same way as a real force, but you cannot identify a second object for the fictitious force z Remember that real forces are always interactions between two objects
Fictitious Forces in Linear Systems z The inertial observer (a) at rest sees z The noninertial observer (b) sees z These are equivalent if F fictiitous = ma sin cos 0 x y FT m a m g θ == =− = 's i n 'c o s 0 x fictitious y F m a m g =−= =

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Example: 591 391
A) “Centrifugal” Force z From the frame of the passenger (b), a force appears to push her toward the door z From the frame of the Earth, the car applies a leftward force on the passenger z The outward force is often called a centrifugal force z It is a fictitious force due to the centripetal acceleration associated with the car’s change in direction z In actuality, friction supplies the force

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## This document was uploaded on 09/27/2011.

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Phys205A_Lecture15 - Lecture 15 Chapter 6 Motion in...

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