| A | B |
|---|
| arm | The beam or bar of a lever. |
| axle | A shaft on which a wheel revolves. |
| driven gear | The gear receiving the force. |
| driving gear | The gear transmitting the force. |
| effort | The force needed to move a load. |
| force | A push or pull on an object; measured in newtons. |
| friction | A force that resists motion whenever the surfaces of two objects rub against each other. |
| fulcrum | The pivot point on a lever. |
| gear | A wheel with teeth. |
| gear ratio | The ratio of the number of rotations of the driving gear to the driven gear. |
| inclined plane | A simple machine consisting of a flat surface that is slanted. |
| joule | A measurement for a unit of work. |
| lever | A simple machine consisting of a rigid bar that is free to pivot on a fulcrum. |
| load | An object that requires force to be moved over a distance. |
| lubricant | A substance used to reduce friction. |
| machine | A mechanical device that helps people do work with less force. |
| mechanical advantage | The benefit created by using machine that allows people to do work while using less force. |
| mobile | An assembly of delicately balanced levers suspended from above by a thread. |
| newton | The international unit of force. |
| pulley | A simple machine that is a wheel with a grooved rim in which a rope can run to change the
direction of the force that lifts a load. |
| ramp | An inclined plane. |
| screw | A simple machine consisting of an inclined plane wrapped around a cylinder. |
| simple machine | A machine that requires only the force of a human to perform work. There are six types. |
| thread | The inclined plane that is wrapped around and protrudes from the shaft of a screw. |
| traction | The amount of friction between two surfaces that allows one surface to travel across another. |
| wedge | A simple machine that consists of two or more inclined planes positioned to form a thin edge. |
| wheel | A disk that turns around an axis. |
| work | The result of a force moving an object over a distance. |
| distance | How far something moves. |
| inertia | The tendency of a moving object to stay in motion or a resting object to stay resting. |
| energy | The ability to do work. |
| potential energy | Stored energy. |
| kinetic energy | Energy of motion. |
| wheel & axle | A simple machine that consists of a large wheel fixed to a smaller wheel or shaft called an axle. |
