Simple Machines

The Physics Hypertextbook™
© 1998-2008 by Glenn Elert -- A Work in Progress
All Rights Reserved -- Fair Use Encouraged

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Discussion

Is this topic even worth teaching anymore?

mechanical advantage, ho hum

M.A. =	Feffort
	Fload

velocity ratio, hum ho.

V.R. =	vload
	veffort

efficiency, Well, I like this part.

η =	Wout
	Win

except for the stupid eta symbol.

The human body is exceptionally efficient at extracting energy from food. Feces retain only about 5% of the chemical energy originally present in the food consumed.

Whad'ya think of that?

Summary

• bullet

Problems

practice

1. Write something.
   • Answer it.
2. Write something else.
   • Answer it.
3. Write something different.
   • Answer it.
4. Write something completely different.
   • Answer it.

numerical

1. problems

Resources

• general
  • Secrets of Lost Empires, Public Broadcasting Service
  • Work is Simple with Simple Machines, Simple machines and their influence in everyday life

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