Lecture 16 friday october 3
Download
1 / 18

Lecture 16 Friday, October 3 - PowerPoint PPT Presentation


  • 45 Views
  • Uploaded on

Lecture 16 Friday, October 3. Chapter 6: Circular Motion. Review Example. Macie pulls a 40 kg rolling trunk by a strap angled at 30° from the horizontal. She pulls with a force of 40 N, and there is a 30 N rolling friction force acting on trunk. What is the trunk’s acceleration?. Slide 5-17.

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 ' Lecture 16 Friday, October 3' - rhett


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
Lecture 16 friday october 3

Lecture 16Friday, October 3

Chapter 6:

Circular Motion


Review Example

Macie pulls a 40 kg rolling trunk by a strap angled at 30° from the horizontal. She pulls with a force of 40 N, and there is a 30 N rolling friction force acting on trunk. What is the trunk’s acceleration?

Slide 5-17


For uniform circular motion the acceleration
For uniform circular motion, the acceleration

  • Is parallel to the velocity

  • Is directed towards the center of the circle

  • is larger for a larger orbit at the same speed


Problem interacting bodies
Problem, interacting bodies

Glider on a air track

Massless, frictionless pulley

m1

m2


Special assignment
Special Assignment

  • Special assignment to be handed in Monday: Workbook pages 4-5 and 4-6, exercises 17-22 and page 5-5, exercises 13-15.


Chapter 6

Circular Motion, Orbits and Gravity

Topics:

  • The kinematics of uniform circular motion

  • The dynamics of uniform circular motion

  • Circular orbits of satellites

  • Newton’s law of gravity

Sample question:

The motorcyclist in the “Globe of Death” rides in a vertical loop upside down over the top of a spherical cage. There is a minimum speed at which he can ride this loop. How slow can he go?

Slide 6-1


Uniform circular motion
Uniform Circular Motion

  • Uniform magnitude of velocity (speed) is constant


Circular motion
Circular Motion

  • Note similarity to the equations for one-dimensional linear motion



Ucm continued
UCM continued

  • Travelling at constant speed v around circle

  • Period is time one around circle = T


Ucm cont
UCM cont

  • s is distance travelled around circumference and the definition of the radian tell us


Uniform circular motion1
Uniform Circular Motion

  • Uniform magnitude of velocity (speed) ω, is constant

  • But α is not zero because direction of velocity is changing.



Newton s second law
Newton’s Second Law

  • Net force must point towards center of circle


Example

A level curve on a country road has a radius of 150 m. What is the maximum speed at which this curve can be safely negotiated on a rainy day when the coefficient of friction between the tires on a car and the road is 0.40?

Slide 6-24



Checking Understanding

When a ball on the end of a string is swung in a vertical circle:

  • What is the direction of the acceleration of the ball?

    • Tangent to the circle, in the direction of the ball’s motion

    • Toward the center of the circle

Slide 6-11


Problems due today
Problems due today

  • 5: 24, 25, 29, 30, 31, 35, 36, 37, 39


ad