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Chapter 10- Circular Motion
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Gravity
Terms in this set (35)
Define rotation
motion about an axis located within the body of the object
Define axis
a straight line around which rotation takes place
Define revolution
motion about an axis located outside the body of the object
What best describes Earth's motion around the sun?
revolution
When you ride a bicycle, the bicycle wheels ____ around their axles.
rotate
What are two examples of rotation?
-a Ferris wheel in motion
-an ice skater doing a pirouette
Define linear speed
the distance traveled per unit of time
Define rotational speed
number of rotations per unit of time
Define tangential speed
the speed of something moving along a circular path
What describes the direction of motion associated with tangential speed?
tangent to the circular path
T/F? The terms linear speed and rotational speed can be used interchangeably.
false
T/F? All parts of a spinning merry-go-round have the same angular speed.
true
The abbreviation RPM stands for _________.
revolutions per min
T/F? Tangential speed is directly proportional to rotational speed.
true
What is an action that results in an increase in a circularly moving object's tangential speed?
-moving farther from the axis of rotation
-increasing the rotational speed
What description describes the relationship between tangential speed, radial distance, and rotational speed?
tangential speed ∼ radial distance x rotational speed
T/F? Your tangential speed while standing at the axis of rotational of a spinning platform is zero.
true
As your radial distance from the center of a rotating platform increases, your ___________ speed also increases.
tangential or linear
How does a tray stay on the tracks when going around a curve?
the wheels rotate at the same rate but cover different distances as they roll.
T/F? Any object moving in a circle is constantly accelerating.
true
Centripetal means _____.
"toward the center"
The force directed toward a fixed center that causes an object to follow a circular path is _________.
centripetal force
If centripetal force ceased to act on an object moving in a circular path, the object would _________.
move in a straight line
Explain where the centripetal force that holds a car in a curved path while rounding a corner comes from.
friction between the tires and road
T/F? In a washing machine's spin cycle, water is forced away from the clothes.
false
What identified a factor that affects the amount of centripetal force acting on an object.
tangential speed, mass, radius of curvature
The apparent outward force on a rotating or revolving body is _______ force.
centrifugal
Description of centrifugal.
away from the center
Describe why you are pressed against the door of a car as it rounds a sharp corner.
because no centripetal force acts to hold you in place
T/F? When a can tied to a string is swung in a circle, an outwardly directed force acts on the can.
false
What causes the centrifugal-force effect?
inertia- the tendency of a moving body to continue moving in a straight line
Imagine riding on a fast moving train. Describe your speed from the reference frame of the train and from a reference frame of the ground outside the train
Sitting in the train, you have no speed at all relative to the train. Relative to the stationary ground, you have no appreciable speed
T/F? In a rotating reference frame, both centripetal and centrifugal force act on objects in the rotating system.
true
The centrifugal force experienced in a rotating reference frame is not a ____ force.
true
What is a true force?
nuclear foce, gravitational force, electromagnetic force
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