statics
Download
Skip this Video
Download Presentation
Statics

Loading in 2 Seconds...

play fullscreen
1 / 9

Statics - PowerPoint PPT Presentation


  • 91 Views
  • Uploaded on

Statics. Static Equilibrium. There are three conditions for static equilibrium. The object is at rest There is no net force There is no net torque. With no motion, forces must sum to zero. Each component is treated separately. Find the tension in the ropes. T is the tension to the left

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 ' Statics' - connley-bogue


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
static equilibrium
Static Equilibrium
  • There are three conditions for static equilibrium.
    • The object is at rest
    • There is no net force
    • There is no net torque
static forces
With no motion, forces must sum to zero.

Each component is treated separately

Find the tension in the ropes.

T is the tension to the left

S is the tension to the right

W is the weight downward

Vertical equality

T sinq = W = mg

T = mg / sinq = 3.9 x 103 N

Horizontal equality

S = T cosq = 3.4 x 103 N

Static Forces

q = 30º

m = 200 kg

offset forces
Offset Forces
  • Balanced forces do not insure static equilibrium.
  • The center of mass is stationary, but the object rotates.

F

-F

static torques
With no rotation, torques must sum to zero.

A ladder leans against a wall with friction against the floor.

Length l

Angle q

Coefficient of static friction m

The sum of torques gives

Static Torques

FNW

FNF = mg

Ffrmmg

-mg

q

pivot point
The calculation of torques is independent of the pivot point.

Select the wall for the pivot.

Pivot Point

FNW

FNF = mg

Ffrmmg

-mg

q

the lever
The lever is a simple machine that increases force.

The downward force is multiplied by the lever arm of the stick to become a torque.

The torque on the rock matches the torque from the person.

The Lever
human lever
Human Lever
  • The elbow joint is a pivot point for a lever.
    • Assume all forces are vertical.
    • Levers may not reduce force.
stability
Stability
  • When is an object in static equilibrium?
    • Check the forces and torques
    • If the torques are from gravity, find the center of mass

next

ad