V. Sample Machines

• Lever is a rigid bar resting on a pivot, used to move a heavy or firmly fixed load with one end when pressure is applied to the other
• 1st class lever: fulcrum is between resistance and effort
• 2nd class lever: resistance is between fulcrum & effort
• 3rd class: effort is between resistance & fulcrum
• Inclined plane is a ramp consists of sloping surface to raise heavy bodies
• Pulley is used to lift or lower heavy object tied on one end of the rope
• Wedge is a simple machine used to separate, lift, or hold an object.
• Wheel and axle is a simple machine that consist of a round disk with a rod
• Screw has a twisted inclined plane wrapped around a cylinder