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Collisions

Across
Activity involving mental or physical effort done in order to achieve a purpose or result
A first, typical or preliminary model of something, especially a machine, from which other forms are developed or copied
Any of the basic mechanical devices for applying a force, such as an inclined plane, wedge, or lever
An instance of one moving object or person striking violently against another
A wheel with a grooved rim around which a cord passes, used especially to increasse speed or power.
A series of steps that engineers follow to come up with a solution to a problem
Relating to or resulting from motion
Down
A principle or standard by which something may be judged or decided
Strength or energy as an attribute of physical action or movement
The strength and vitality required for sustained physical or mental activity
A sloping ramp up which heavy loads can be raised by ropes or chains
A projecting arm or handle that is moved to operate a mechanism
A limitation or constriction
An encounter between two bodies in which the total kinetic energy of the two bodies after the encounter is equal to their total kinetic energy before the encounter
One in which part of the kinetic energy is changed to some other form of energy
The quantity determining the energy of mass in a gravitational field or of charge in an electric field
A person who designs, builds, or maintains engines, machines, or public works