angular motion l.
Skip this Video
Loading SlideShow in 5 Seconds..
Angular Motion PowerPoint Presentation
Download Presentation
Angular Motion

Loading in 2 Seconds...

play fullscreen
1 / 9

Angular Motion - PowerPoint PPT Presentation

  • Uploaded on

Angular Motion. We use degrees to measure position around the circle. There are 2 p radians in the circle. This matches 360 ° The distance around a circle is s = r q , where q is in radians. Measuring a Circle. Dq. q. r. The angular displacement is Dq. Angular Velocity.

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

Angular Motion

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
measuring a circle
We use degrees to measure position around the circle.

There are 2p radians in the circle.

This matches 360°

The distance around a circle is s = rq, where q is in radians.

Measuring a Circle




The angular displacement is Dq

angular velocity
Angular Velocity
  • For circular motion, only the time rate of change of the angle matters.
  • The time rate of change of the angle is called the angular velocity.
    • Symbol (w)
    • Units (rad/s or 1/s = s-1)
velocity and angular velocity
Velocity and Angular Velocity
  • Velocity has an angular equivalent.
    • Linear velocity (v)
    • Angular velocity (w)
  • They are related, since the displacement is related to the angle.
cycles or radians
Frequency is measured in cycles per second.

There is one cycle per period.

Frequency is the inverse of the period, f =1/T.

Angular velocity is measured in radians per second.

There are 2p radians per period.

Angular velocity, w = 2p/T.

Angular velocity, w = 2pf.

Cycles or Radians
direction of angular velocity
Direction of Angular Velocity
  • Angular velocity can be clockwise or counterclockwise around the axis of rotation.
  • It has magnitude and direction – it must be a vector.
    • Only two directions are possible for a fixed axis
right hand rule
Right-hand Rule
  • Along the axis of rotation there are two directions.
  • The angular velocity can point either way along the axis of rotation.
  • By convention the direction follows the thumb if the rotation follows the curve of the right hand.
angular acceleration
Angular Acceleration
  • In uniform circular motion there is a constant radial acceleration.
    • ar = v2 / r = rw2
  • If the angular velocity changes there is acceleration tangent to the circle as well as radially.

The angular acceleration is a

angular acceleration vector
Angular Acceleration Vector
  • The angular acceleration vector is the time derivative of the angular velocity vector.
    • Along the axis if the angular velocity only changes magnitude
    • In other directions if the axis changes direction