Round
and
Round
with wheels and axles

Going to faraway places or just stepping in and out, ease of motion is what this simple machine is all about.

By Glen Phelan

Before you read
Wheel and Axle

Simple  
Machines

Explorer magazine’s six‑part series

Simple Machines

Explorer magazine’s six‑part series

lever
inclined plane
Wedge
screw
wheel and axle

This edition

pulley

Human Journey

Physical Science

Before you do the science activity at the end of this article, think about how you will record the results.