Heat is the movement of molecules within a material. The greater the rate of movement, the greater the heat.

sides and angles are interdependent: a change cannot be made to an angle without altering the length of at least one side, and vice versa. By comparison, a square can be deformed into a parallelogram without changing a side.

Most engineered systems rely on negative feedback. In some instances, such as when momentum is desired, a positive feedback loop may be sought.

The integrity of their relationship will be maintained only if the system is designed to perform

The center of gravity of an object is the average position of the particles that comprise it—the point on which it will balance.

Buoyant uplift force on an object equals the weight of the water that the object displaces. If a building’s

In practice, however, faster work produces more confusion, errors, substandard quality, and overtime pay, driving up costs. An extremely long work period also increases total costs, particularly indirect costs. Optimal project duration minimizes the combination of indirect and direct costs.

remain stationary, move, or

White water is potable (consumable) water from a natural source such as a spring, or that has been treated by a municipal or similar purification system.