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### 45 Cards in this Set

• Front
• Back
 Acceleration The time rate of change of velocity; a vector quantity. Centripetal Acceleration The acceleration that results in the uniform motion of an object in a circular path; a vector quantity directed toward the center of curvature. Centripetal Force The force needed to keep an object moving in a circular path; a vector quantity directed toward the center of curvature. Closed System A group of objects, not acted upon by any external force. Coefficent of Friction The ratio of the frictional force to the normal force. Displacement The change in position of an object described by the vectore that begins at the initial position of the object and ends at its final position. Distance The total length of the path that an object travels; a scalar quantity. Equilibrium State of an object when the net force acting on it is zero. Free Fall The ideal falling motion of an object acted upon by the force of gravity. Free-body Diagram A sketch, or scale drawing, that shows all the forces acting concurrently on an object. Friction The force that opposes the relative motion of two objects in contact; a vector quantity. Gravitational Field A region in space where a test particle would experience a gravitational force. Gravitational Field Strength The force per unit mass at a given point in a gravitational field; a vector quantity. Gravitational Force The attractive force between two objects due to their masses; a vector quantity. Gravity The force between the mass of Earth and the mass of any object in the vicinity of Earth; a vector quantity. Horizontal Component A component velocity vector whose direction is parallel to the horizon. Impulse The product of the average force applied to an object and the time during which the force acts; a vector quantity. Inertia The resistance of an object to a change in its motion; directly proportional to object's mass. Instantaneous Velocity The velocity of an object at any particular instant in time; a vector quantity. Kinetic Friction The friction of motion between objects in contact; a vector quantity. Kilogram The fundamental SI unit of mass. Law of Conservation of Momentum States that energy can be neither created nor destroyed. Linear Motion An object's change of position along a straight line. Mechanics The branch of physics that deals with forces and their effects in producing and changing motion. Meter The fundamental SI unit of length. Momentum The product of an object's mass and velocity; a vector quantity. Net Force The vector sum of the concurrent forces acting oin an object. Newton The force that imparts an acceleration of one meter per second squared to a one kilogram mass. Normal Force The force pressing two contracting surfaces together; on a horizontal surface, the normal force is equal in magnitude but opposite in direction to the weight of an object resting on the surface; a vector quantity. Pendulum A mass (bob) attached to one end of a string or wire that is attached at the other end to a pivot point. Period (of a Pendulum) The time required for a displaced pendulum to complete one cycle of motion; a scalar quantity. Resolution of forces The process of determining the magnitude and direction of the components of a force. Resultant The single vector that is equivalent to the combined effect of two or more vectors. Second The fundamental SI unit of time. Speed The distance that an object moves in a unit of time; a scalar quantity. Static Friction The force that opposes the start of motion; a vector quantity. Tangent A line on a graph whick passes through a point and has a slope equal of the curve at that point. Unbalanced Force A nonzero net force acting on an object; a vector quantity. Uniform Circular Motion The motion of an object traveling in a circular path at constant speed. Uniform Motion The motion of an object moving at constant speed. Vacuum A region of empty space. Vector Component (of a force) The two or more concurrent forces whosee vector sum is the acting force. Velocity The time rate of change of an object's displacement; a vector quantity. Vertical Component (of velocity) A component velocity vector whose direction is at right angles to the horizon. Weight The gravitational force with which a planet attracts a mass; a vector quantity.