Transcript Circular Motion- Centripetal Force

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Linear Speed increases when the distance from
the center of the axis increases. Linear Speed
increases when the rotational speed increases.
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http://www.youtube.com/watch?v=qsqpuRI
wxoY
Pull inward
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A force is required to
maintain circular
motion
Any force that causes
an object to follow a
circular path is called
a centripetal force.
Centripetal means
“center-seeking”
Gravitational force
that holds the moon
in orbit is a
centripetal force
Electrical forces
holding the electrons
in orbit around the
nucleus are
centripetal forces

When a car rounds a
corner, the _____and
_____ provide the
centripetal force


tires
road


If the tires are worn
smooth, if the car is
going very fast or
the road is icy or
oily, this friction
force will not be
available.
The car will not be
able to move in a
circle, it will try to
go in a straight line
and possibly go off
the road.
• Draw the direction it would travel if released
at 1 and 2
1
2
1
2
• The object would travel tangent to the circle in a
straight line
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1) The ___ rotates at
high speed during the
spin cycle
2) The tub’s _______
exert force on the
clothes, but the holes
prevent the tub exerting
the same force on the
______.
3) _____ allows the
water to escape in a
straight line.
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http://jalopnik.com/5415082/fifth-gearbrings-hot-wheels-to-life-sets-real+lifeloop+the+loop-record

“Centrifugal force” is a fictitious force - it is
not an interaction between 2 objects, and
therefore not a real force.

Nothing pulls an object away from the
center of the circle.

What is erroneously attributed to
“centrifugal force” is actually the action of
the object’s inertia - whatever velocity it
has (speed + direction) it wants to keep.

http://www.youtube.com/watch?v=dls_cBm
Ut7Q