Raising a Bag of Toys: Pulley vs. Inclined Plane (First Step Nonfiction ― Simple Machines to the Rescue)

Is it easier to lift a bag full of toys with an inclined plane or a pulley? Readers will see how a group of kids compares two simple machines and decides which one does a better job at lifting the bag. This book supports engineering design standards for primary grades in the Next Generation Science Standards.