Simple MachinesBook - 2015
Machines help make work easier, like when you need to lift something heavy or reach way up high. There are six simple machines: the lever, the wheel and axle, the pulley, the ramp, the wedge, and the screw. Can you adjust a seesaw to lift an elephant? What happens when you combine two or more simple machines? Read and find out!
Publisher: New York, NY : Harper, an imprint of HarperCollins Publishers, 
Edition: First edition
Copyright Date: ©2015
Characteristics: 37 pages : color illustrations ; 21 cm