Curious readers will discover how screwdrivers tighten screws using different kinds of tips. A back matter spread explains how screws are simple machines used to fasten objects together.
Beginning readers will explore how hammers pound in and pull out nails. A back matter spread explains how hammers are one kind of simple machine: a lever.
Learners will understand how saws have sharp teeth that cut through wood. A back matter spread explains how saws are a kind of simple machine: a wedge.