chapter 9 circular motion
Download
Skip this Video
Download Presentation
Chapter 9: Circular Motion

Loading in 2 Seconds...

play fullscreen
1 / 12

Chapter 9: Circular Motion - PowerPoint PPT Presentation


  • 83 Views
  • Uploaded on

Chapter 9: Circular Motion. Axis. An axis is the straight line around which rotation takes place. Rotation. When an object turns about an internal axis. An axis located within the body of the object The motion is also called spin. Earth Rotates about its axis once every 24 hours.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Chapter 9: Circular Motion' - trina


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide2
Axis
  • An axis is the straight line around which rotation takes place
rotation
Rotation
  • When an object turns about an internal axis.
    • An axis located within the body of the object
  • The motion is also called spin.
    • Earth Rotates about its axis once every 24 hours.
revolution
Revolution
  • When an object turns about an external axis.
    • Earth Revolves around the sun once every 365¼ days.
linear speed
Linear Speed
  • What we simply called speed in Chapter 2.
    • A distance moved per unit time.
    • Linear speed varies based on radius of a circle.
    • On the Merry-Go-Round, the horses on the outermost ring have to travel faster to keep up with the horses that are closer to the center axis.
tangential speed
Tangential Speed
  • The speed of something moving along a circular path.
  • We call it tangential motion because the speed is always tangent to the circle.
  • We can use tangential speed and linear speed as the same thing for circular motion.
rotational speed
Rotational Speed
  • The number of rotations per unit of time. Symbol (ω-omega)
  • Sometimes called angular speed.
  • All parts of the merry-go-round rotate about their axis in the same amount of time.
    • Units for Rotational Speed = Rev. / second or Rev. / min.
  • The record player rotates with a rotational speed of 72,000RPM.
  • Tangential Speed = Radial dist x Rotational Speed

v= r ω

centripetal force
Centripetal Force
  • Any force that causes an object to follow a circular path.
    • Centripetal means “center seeking” or “toward the center.”
    • The force that holds the occupants in a rotating ride.
centrifugal force
Centrifugal Force
  • The Physics curse word!!!
  • Very commonly misused.
  • Means “center-fleeing” or “away from the center.”
  • Misconception that centrifugal force pulls you outward during circular motion.
    • Actual force is just the inertia of the body traveling tangent to the circle.
slide10
As a ball is whirled above the head, it is the inertia of the ball that wants to continue moving in a straight line. Instead, the ball is forced inward to change its direction (Centripetal Force-supplied by string).
simulated gravity
Simulated Gravity
  • When a wheel or apparatus is spun at just the right speed so that the acceleration feels like the gravity they are accustomed to.
equations to note
Equations to Note:
  • ac= v2/r
  • Fc = (mv2)/r
  • Vrotational = r ω = (2π r)/t
ad