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Conceptual Physics - Chapter 10: Circular Motion
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Flash card set for chapter 10 of Conceptual Physics by Hewitt
Terms in this set (14)
Centripetal force
The force that keeps an object in circular motion. The force directed toward a fixed center that causes an object to follow a circular path.
Axis
The straight line around which rotation takes place.
What are two types of circular motion?
Rotation and Revolution.
Rotation
When an object turns about an internal axis (an axis located within the body of an object),also called spin.
Revolution
When an object turns about an external axis.
Linear speed
Distance traveled per unit time.
Tangential speed
The speed of an object moving along a circular path. Can be used interchangeably with linear speed for circular motion.
Rotational speed
The number of rotations per unit time. Commonly expressed as RPM or revolutions per minute.
What is the relationship between tangential speed, rotational speed, and radial distance.
Tangential speed is directly proportional to the rotational speed and radial distance. v∼ rw
Why does a moving freight train stay on the tracks?
The wheel rims are slightly tapered which causes them to re-center themselves if they get off of center.
What factors affect the centripetal force acting on an object?
It depends on the objects mass, tangential speed, the radius of its circular path. F = mv²/r
Centrifugal force
An apparent outward force on a rotating or revolving body.
What causes the "centrifugal-force effect"?
The "centrifugal−force effect" is attributed not to any real force but to inertia − the tendency of the moving body to follow a straight−line path.
Why is centrifugal force not considered a true force?
Centrifugal force is an effect of rotation. It is not part of an interaction and therefore it cannot be a true force.
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