How many simple machines do you use every day? Probably more than you realize Machines make work easier-- helping break things apart, lift heavy objects, and change the power and direction of force applied to them. In this accessible picture book, celebrated...
How many simple machines do you use every day? Probably more than you realize Machines make work easier-- helping break things apart, lift heavy objects, and change the power and direction of force applied to them. In this accessible picture book, celebrated...