Mechanical Comprehension – Test 1

The doorknob is an example of the machine called wheel and axle.

Physics is the science concerned with describing the interactions of energy, matter, space, and time; especially interested in what fundamental mechanisms underlie every phenomenon

Base Quantity is a physical quantity chosen by convention and practical considerations such that all other physical quantities can be expressed as algebraic combinations of them

Inertia is the ability of an object to resist changes in its motion.

A lever's three basic parts are the fulcrum, force (or effort), and resistance.

A law is a description, using concise language or a mathematical formula, of a generalized pattern in nature supported by scientific evidence and repeated experiments

The pivotal point of a lever is the fulcrum.

Dynamics is the study of how forces affect the motion of objects and systems

A newton is the SI unit of force needed to accelerate an object with a mass of 1 kg at a rate of 1 m/s²

order of magnitude is the size of a quantity as it relates to a power of 10

English units are a system of measurement used in the United States; includes units of measure such as feet, gallons, and pounds

Model means a representation of something often too difficult (or impossible) to display directly

The simplest machine is a lever.

Conversion factor is a ratio that expresses how many of one unit are equal to another unit

Multiplying force is a main benefit of machines.

The two basic principles in machines are lever and inclined plane.