BY JOSEPH KELLY

TWO INCLINED PLANES PUT TOGETHER WITH A SHARP THIN TIP

TWO MORE EXAMPLES ARE A KIFE OR ALSO A PICK AXE

A CYLINDER WITH AN INCLINED PLANE WRAPPED AROUND IT

TWO MORE EXAMPLES OF A SCREW ARE JAR LIDS OR A BOLT

TWO MORE EXAMPLES OF A SCREW ARE JAR LIDS OR A BOLT

A WHEEL WITH A GROOVED RIM SO A ROPE OR CORD CAN GO THROUGH

TWO MORE EXAMPLES ARE AN ELEVATOR AND A FLAG POLE

THEY TURN TOGETHER ACTING LIKE A COLLECTION OF TURNING LEVERS

TWO MORE EXAMPLES WOULD BE A SCREW DRIVER OR A STEERING WHEEL

A SOLID BAR THAT PIVETS ON A FULCRUM POINT

TWO MORE EXAMPLES OF A LEVER ARE A BALANCE SCALE OR FISHING ROD

A SLOPING SURFACE MAKING IT EASIER TO LIFT ITEMS

TWO MORE EXAMPLES WOULD BE A BOARD OR RAMP