# Simple Machines Notes - EVELYN BAUTISTA-PABLO - Can you pop...

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Can you pop a cap off of a bottle of soda by using just your fingers? You probably can’t, especially if the bottle doesn’t have a screw cap! Instead, you use a bottle opener. Similarly, you don’t use the palm of your hand to drive a nail into a block of wood. Instead you use a hammer. These simple machines make doing work easier. What Are Simple Machines? The most basic machines are called simple machines. Other machines are either modifications of simple machines or combinations of several simple machines. Figure 1 shows examples of the six kinds of simple machines. The six types of simple machines are the simple lever, the pulley, the wheel and axle, the simple inclined plane, the wedge, and the screw. Simple machines are divided into two families: the lever family and the inclined plane family. The Lever Family Imagine using a claw hammer to pull out a nail. As you pull on the handle of the hammer, the head of the hammer turns around the point where the hammer meets the wood. The force applied to the handle is transferred to the claw on the other end of the hammer. The claw hammer is a lever. All levers have a rigid arm that turns around a point called the fulcrum. The input force in multiplied or redirected into an output force. Levers are divided into three classes. Levers are divided into three classes depending on the locations of the fulcrum, the input force, and the output force, as Figure 2 shows. First-class levers, such as the claw hammer, are the most common kind of lever. A pair

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of pliers is made of two first-class levers joined together.
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