Work, Machines, and Energy
Two conditions must be met in order for work to be done:
The object moves
A force must act on the object in the direction the object moves.
In this lesson we look at the concepts required to do work. Additionally we look
at simple and complex machines, and forms of energy.
the movement of an object in a direction.
the the rate ate which work is done.
Work is made easier by machine. There are
complex machines. Compound machines are made up of two or more simple machines.
The number of times a machine multiplies an effort force is its
Mechanical efficiency (ME) of
a machine compares its work output with its work input.
The formula for mechanical efficiency is:
ME = work output/work input x 100%
Energy is the ability to do work.
Turn it in or e-mail it to your teacher.
Compound Machine Design
Create a poster (drawing) of a compound machine that will demolish houses.
The machine will be movable. Use more than one simple machine. The
machine must be able to be 'reused'.
Write a one paragraph essay describing the compound and how the simple machines
Scan the picture and attach the essay. Turn the drawing in or e-mail the
poster to your teacher.
Find pictures of simple machines and create a collage using PowerPoint.