unit 2

3. A machine made up of two or more simple machines.
4. A first-class lever that has an axle attached to a supporting structure and changes the direction of force.
6. A mechanism that changes the direction or magnitude of a force.
7. The greatness of size or amount.
10. is the energy transferred when a force F is applied to an object moving through a distance d.
11. Impeding effect exerted by one material object on another.
12. Fixed and movable pulleys in combination that provide mechanical advantage and a change of direction for effort force.
13. A machine made up of two or more simple machines.
14. An external force applied to an object.

1. A representation of a real-world situation or system using mathematical concepts and language.
2. The ratio of the force produced by a machine to the force applied to it, used in assessing the performance of a machine.
5. A systems approach for analyzing the physical interaction of the human worker with his/her work environment to maximize productivity, quality, usability, safety, health, and comfort.
6. Understanding a system by examining the connections between the parts that compose the entirety of the system.
8. A visual representation of an idea. A conceptual model can be a sketch, concept map, schematic, flow chart, or any other visual representation.
9. A pulley with an axle in a movable block that is supported by two parts of the same rope. In a movable pulley, force directions stay constant.