simple machines

1. pulley

1.1. a wheel with a grooved rim around which a cord passes. It acts to change the direction of a force applied to the cord and is chiefly used (typically in combination) to raise heavy weights.

2. power

2.1. the ability to do something or act in a particular way, especially as a faculty or quality. the capacity or ability to direct or influence the behavior of others or the course of events.

3. work

3.1. activity involving mental or physical effort done in order to achieve a purpose or result.

4. mechanicla advantge

4.1. the ratio of the force produced by a machine to the force applied to it, used in assessing the performance of a machine.

5. wedge

5.1. a piece of wood, metal, or some other material having one thick end and tapering to a thin edge, that is driven between two objects or parts of an object to secure or separate them.

6. screw

6.1. a short, slender, sharp-pointed metal pin with a raised helical thread running around it and a slotted head, used to join things together by being rotated so that it pierces wood or other material and is held tightly in place.

7. wheel and axle

7.1. a simple lifting machine consisting of a rope that unwinds from a wheel onto a cylindrical drum or shaft joined to the wheel to provide mechanical advantage.

8. 2nd class levers

8.1. A lever in which the load lies between the fulcrum and the effort. A wheelbarrow is an example of a second-class lever. see saw. A long, narrow board equally balanced in the middle on a fulcrum.

9. incline planes

9.1. An inclined plane, also known as a ramp, is a flat supporting surface tilted at an angle, with one end higher than the other, used as an aid for raising or lowering a load.

10. 3rd class levers

10.1. third-class lever. A lever in which the effort is placed between the fulcrum and the load. A baseball bat is an example of a third-class lever.

11. 1st class levers

11.1. This allows the identification of three classes of levers by the relative locations of the fulcrum, the resistance and the effort: Class 1: Fulcrum in the middle: the effort is applied on one side of the fulcrum and the resistance on the other side, for example, a seesaw, a crowbar or a pair of scissors.