Levers

A Lever is a Rigid body free to move about a single point which may cause a load to move with an applied force

The Moment of a Force is a measure of its turning effect.

If you push a door from near its hinges, it takes more effort, than it does if like every other normal person you close / open a door from the side furthest the hinges.

The Moment of a Force is calculated by the product of the Applied Force x the perpendicular distance from the Fulcrum

Where we have stationary bodies due to the balancing of forces, a body can rotate unless the Moments one direction equal the moments in the other direction.

Sum of moments Fendt demo

  1. all the masses are the same

  2. You may only Remove masses

  3. start on the right hand side

  4. how can we balance the meter stick,

  5. what happens next

So we did this in the virtual world, where does it happen in real life ?

List examples of 'levers' the simplest machines.

follow on here

http://sites.google.com/site/giantscience/science/physics/forces


The Fulcrum center Lever

Sciscors

The Load center Lever

Nutcracker wheelbarrow

The Effort center Lever