CAE 210 Midterm: CAE 210 CONCEPTS

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First law (when f=0): an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction if the sum of the forces acting on it are zero. Second law (when f=0, f = ma): object accelerates are not zero if the sum of the forces acting on it. Third law: for every action there is an equal and opposite reaction. The basic units are length, time, and mass which are arbitrarily defined as the meter (m), second (s), and kilogram (kg). The basic units are length, time, and force which are arbitrarily defined as the foot (ft), second (s), and pound (lb). Mass is the derived unit, as slug (lb/ft. sec) Represented by a number-unit combination independent of the reference coordinate system. Vector: quantity described by its magnitude and direction represented by an arrow and a number-unit combination dependent of the reference coordinate system.