Requirements or limitations that must be followed are called __________.

After evaluating tests, engineers often __________ the design to make it better.

The final step of the design process is to __________ the results to others.

Brainstorming works best when no one __________ ideas prematurely.

A design that must meet a certain size, weight, or budget has strict __________.

Civil engineers design and build the __________ that allow communities to function.

Roads, bridges, and power systems are part of a city’s __________.

Ancient Roman __________ carried fresh water into cities using gravity.

A(n) __________ bridge works mainly by using a curved structure under __________ forces.

In a suspension bridge, the main cables carry __________ while the towers handle __________.

A __________ controls water flow and creates reservoirs for storage.

The force that all structures must ultimately resist is __________.

The Roman Empire is known for constructing strong, long-lasting __________ that improved trade.

Transportation systems like highways and railways move people and goods, reducing __________ between locations.

Compression and __________ are the two most important forces acting on bridge structures.

Simple machines help make work easier by multiplying the __________ applied.

This increase in force is called __________ advantage.

A first-class __________ places the fulcrum between the input and output forces.

A Rube Goldberg machine solves a simple task in a very __________ way.

Newton’s First Law states that an object in motion stays in motion unless acted on by an __________ force.

On a roller coaster, the greatest amount of __________ energy is found at the top of the first hill.

When fuel is ignited inside an engine, the expanding gases push the __________ downward.

Heat engines convert differences in __________ into mechanical work.

Mechanical systems lose useful energy due to __________, which opposes motion.

Potential and __________ energy constantly transform during roller coaster movement.

Airplanes experience four main forces: lift, weight, thrust, and __________.

The wing of an airplane produces __________ because air travels faster over the top surface.

The force pulling an aircraft toward Earth is called __________.

Engine power that moves an aircraft forward is known as __________.

Aerodynamics is the study of how __________ moves around solid objects.

__________ is the air resistance that slows an aircraft as it moves through the atmosphere.

The three types of aircraft motion are pitch, __________, and yaw.

Pilots adjust control surfaces to change the aircraft’s __________ in flight.

Lift works opposite of __________, helping keep the aircraft in the air.

Drag increases when the aircraft presents a larger __________ area.

A design built to test an idea is known as a __________.

Bridges must resist the downward pull of __________.

A heat engine performs work using differences in __________.

An arch bridge is strong because it directs forces into the ground through __________.

__________ is the resistance an aircraft faces as it moves through the air.

The force that pushes a plane forward is __________.

The engineering design process encourages engineers to __________ and improve ideas repeatedly.

The Roman __________ system supported travel and trade across the empire.

In a mechanical system, energy can be lost due to __________.

The upward force acting on an airplane wing is called __________.