Here are some examples of simple machines:
* Lever: A rigid bar that pivots on a fixed point called a fulcrum. Examples: seesaw, crowbar, bottle opener.
* Wheel and axle: A wheel attached to a central rod (axle) that rotates with it. Examples: bicycle wheel, doorknob, car steering wheel.
* Pulley: A wheel with a groove that supports a rope or cable. Examples: crane, elevator, window blinds.
* Inclined plane: A flat surface tilted at an angle to the horizontal. Examples: ramp, slide, stairs.
* Wedge: A triangular tool used to split or separate objects. Examples: axe, chisel, knife.
* Screw: An inclined plane wrapped around a cylinder. Examples: screw, jar lid, drill bit.
Simple machines reduce the effort needed to perform work by changing the direction of force, increasing the distance over which the force is applied, or both.
