A simple machine is a device that uses a single applied force to do work against a single load force. Simple machines do not involve the use of electricity or combustion, and are typically used to amplify or change the direction of applied forces.
The six types of simple machines are:
Lever: A bar that pivots around a fixed point, or fulcrum, to amplify or change the direction of applied forces.
Pulley: A grooved wheel with a rope or cable passing over it, used to change the direction of an applied force.
Inclined Plane: A flat surface that is angled, used to reduce the amount of force needed to lift an object.
Wedge: A triangular shape with one sloping side, used to split or lift objects by applying force at the sloping angle.
Screw: A spiral groove that helps convert rotational motion into linear motion.
Wheel and Axle: A cylinder that rotates around a central point (the axle), used to reduce the amount of force needed to move an object.