D_TEXTBLOCK_TEXT A device used to help do <HL Topic=Work.tpc>WORK</HL> is called a machine. With a machine, a <HL Topic=Force.tpc>FORCE</HL> (the <HL Topic=Effort.tpc>EFFORT</HL>) applied at one part of the machine overcomes another force (the <HL Topic=Load.tpc>LOAD</HL> or <HL Topic=Resistance.tpc>RESISTANCE</HL>) at a different part of the machine. A machine can also change the direction of a force. Examples of simple machines are: <HL Topic=Incline.tpc>INCLINED PLANES</HL>, <HL Topic=Lever.tpc>LEVERS</HL>, <HL Topic=Pulley.tpc>PULLEYS</HL>, <HL Topic=Screw.tpc>SCREWS</HL>, <HL Topic=Wedge.tpc>WEDGES</HL>, and <HL Topic=Wheel.tpc>WHEELS AND AXLES</HL>.