References

Home Screws Wheels/Axles Wedges Inclined Planes Pulley/Lever Games Standards About Us References Work

 

Auch, Alison. Cool Tools. Minneapolis: Compass Point Books, 2002.

 

Frost, Helen. What Are Levers?. Mankato: Capstone Press, 2001.

 

Frost, Helen. What Are Pulleys?. Mankato: Capstone Press, 2001.

 

Frost, Helen. What Are Screws?. Mankato: Capstone Press, 2001.

 

Frost, Helen. What Are Wedges?. Mankato: Capstone Press, 2001.

 

Frost, Helen. What Are Wheels and Axles?. Mankato: Capstone Press, 2001.

 

Simple Machines. 2 Feb. 2005. <www.askjeeves.com>.

 

Simple Machines. 25 Feb. 2005 <www.smartown.com/sp2000/machines2000/main>.