| A | B |
|---|
| Lever | bar or plank that pivots |
| 1st Class lever | Fulcrum is in center |
| 2nd Class lever | Load is in center |
| 3rd Class lever | Effort force is in center |
| Wedge | two slopes that push to the sides |
| Inclined plane (ramp) | simple machine that does not move |
| Screw | Inclined plane wrapped around a post |
| Work | Force causes something to move |
| Wheel & axle | post set in the center of a wheel |
| Pulley | wheels with ropes |
| Block and Tackle | Several pulleys together |
| Mechanical advantage | number of times a machine multiplies force |
| Joule | SI unit of work and energy |
| Simple machine | Machine that multiplies force in one movement |
| Compound machine | Two or more simple machines |
| Efficiency | Force out, minus friction |
