APT Glossary 3.3

Work

A change in position caused by a force.

Viscosity

The ability of a fluid to resist forces.

Terminal velocity

A point at which the force exerted by gravity on a falling object is equaled by the
resistance to force of a fluid.

Static friction

The friction that holds two objects in place when in contact with each other

Solvent

A liquid capable of dissolving other substances.

Solution

A homogeneous mixture, typically liquids.

Solute

A dissolved substance.

Shear force

A type of force when two objects slide parallel to one another

Liquid

Matter that has a definite volume, but no definite shape.

Kinetic friction

- Friction that occurs when two bodies are in motion in respect to each other

Hydrodynamics

- The study of liquids when they are in motion

Heat

The flow of energy from a substance of higher temperature to a substance of a lower temperature.

Gas

Matter that has neither defined volume nor defined shape.

Friction

Resistance of relative motion between two bodies.

Freezing point

Temperature at which a liquid freezes.

Force

An influence that changes the motion of an object, or produces motion of a stationary object.

Fluid

- A substance that changes shape at a steady rate when acted on by a force. Can be a liquid or a gas.

Density

The amount of matter per unit volume.

Convection

- Heat transfer when heat is transferred by currents in a fluid.

Conduction

Heat transfer from atom to atom when materials come in direct contact with each other.

Cohesion

The molecular attraction between surfaces of similar bodies

Bernoulli's Principle

- A principle in which air flowing through a narrow portion of a tube increases in velocity
and decreases in pressure.

Atomizer

An apparatus for reducing liquids to a fine spray

Atomized

To reduce to fine particles or spray

Antifreeze

- An ethylene glycol chemical mixture used with water to lower the freezing point of engine coolant

Airfoil

Any surface designed to aid in lifting or controlling an aircraft by making use of air currents

Aerodynamics

The study of air when in motion

Adhesion

The molecular attraction between the surfaces of unlike bodies.