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PHYS 2010 Chapter Notes - Chapter 5.1-5.6: Circular Motion, Net Force, Centrifugal Force

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amberporcupine279

29 Jul 2017

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Document Summary

Uniform circular motion - when an object moves in a circle at a constant speed. Magnitude of velocity is the same, but direction is constantly changing. Centripetal acceleration, radial acceleration (cid:4666)(cid:4667) - the acceleration of the object because the direction of the velocity is always changing. Circular motion often described in terms of frequency (f), the number of revolutions per second. The period (t) is the time required for one complete revolution. =(cid:3118)(cid:3045) , r = radius of circle. Acceleration and net force are always directed toward the center of the circle. If you swing a ball on a string and let it go, it will go in the direction of the velocity it is at the exact moment you let it go. Centrifugal force - nonexistent, word to describe the feeling of being pushed outside the circle.

Related textbook solutions

Physics: Principles with Applications

7th Edition, 2013

ISBN: 9780321625922

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Related Questions

In a uniform circular motion,

A. the acceleration and the velocity are always parallel.

B. the velocity always points towards the center of the circle.

C. the direction between the velocity and the acceleration will vary as the object moves around the circle.

D. the velocity is always constant in magnitude and direction.

E. the acceleration and the velocity are always perpendicular.

When an object moves in a uniform circular motion, the direction of its acceleration is:

A) In the same direction as its velocity vector.

B) In the opposite direction of its velocity vector

C) Is directed away from the center of its circular path.

D) Is directed toward the center of its circular path.

E) It depends on the speed of the object.

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This experiment involves centripetal force, the force that keeps objects moving in a circular path. This force is perpendicular to the motion and directed towards the center of the circular orbit. By Newton's Second Law when a centripetal force acts on a mass (in a horizontal plane), the force continually changes the direction of the velocity without changing its magnitude, speed. This change in the direction of the velocity accounts for the centripetal acceleration of the mass, whose direction is towards the center. The relationship between the centripetal force, the mass of the orbiting object, and its speed and distance from the center is described by:

EXTENSION QUESTION: When twirling the mass, students found that despite their best efforts, they could not swing the ball so that the cord remained exactly horizontal.

(a) On the diagram of the rotating mass below, draw a force diagram of the forces acting on the mass and identify each force. Do not include any force components in this diagram.

(b) Explain why it is not possible for the ball to swing so that the cord remains exactly horizontal. Write your answer using complete sentence