Science Buddies: "Ask an Expert"

The problem was
Which can help you pull a wagon full of books?
a Lever
b screw
c fulcrum
d wheel and axle

The Ask an Expert forums are for students (and families) working on hands-on science projects.

If you have questions about these terms, this resource on simple machines may be useful.

https://www.sciencebuddies.org/science- ... background

Amy
Science Buddies