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### 85 Cards in this Set

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 Acceleration The rate at which an object increases in speed. Air Resistance Friction that results when an object is in free fall. Average Speed The average of all the speeds of an object. Average Velocity The average of all the instantaneous velocities. Deceleration The rate at which an object decreases in speed. Displacement The amount of space between an object's original location and the object's current placement. Distance The amount an object has traveled. Frame of Reference The center of what you are concerned with. Free Fall The state of an object in motion that is only under the influence of gravity. Gravitational Acceleration Acceleration that is caused by a gravitational force. Instantaneous Velocity The speed of an object at one instant. Linear Motion Motion in one demension. Meter The unit of distance in the metric system. Meter/second The unit of Velocity in the metric system. Meter/second2 The unit of acceleration in the metric system. Odometer A device that measures distance, most commonly in a car. Projectile Motion The motion of an object acted on by gravity. Rate The speed at which something happens. Revolution (Earth's) The movement of the Earth around the sun. Rotation (Earth's) The movement of the Earth on its axis. Speed How fast something is moving. Speedometer A device that measures instantaneous speed, usually on a car. Velocity The speed of an object. BTU British Thermal Unit Calories A unit of energy. Chemical Energy Energy associated with chemical bonds. Coal A form of solar energy Conservation of Energy The principle that energy is never destroyed or created, and is just transferred into another form. Derived Unit A unit that is created out of base units. Elastic Potential Energy Stored Energy associated with objects that have the ability to return to their original form. Electromagnetic Energy Energy associated with the electromagnetic spectrum. Energy The property of an object that enables it to do work. Fundamental Units Base units in a system. Geothermal Energy Energy associated with the world's heat. Heat Energy Energy associated with heat. Horsepower English unit of power. Infrared Radiation Heatwaves. Joules The unit of energy and work. Kinetic Energy Energy associated with the movement of an object. Mechanical Energy Energy associated with mechanics. Nuclear Energy Energy associated with nuclear power. Potential Energy Stored energy. Power The rate at which work is done over time. Photosynthesis Plants absorbing sunlight. Reference level The level at which you measure from. Simple Harmonic Motion Any sort of back-and-forth motion, such as a pedulum. Watts The unit of power. Work When a force move an object. Work-Energy Theorem The theorem that the energy used is equal to the work done. Abrasive Material that increases friction. Action-Reaction Pair Two equal and opposite forces. Balenced Forces When forces acting on an object in the same direction are equal, and so the object is in equilibrium. Contact Friction Friction that takes place when objects make contact. Drag Air resistance on a car. Dynamics The study of objects in equilibrium. Fluid A liquid or gas. Fluid Friction Friction that takes place when a solid object moves through a liquid or gas. Force A push or pull. Friction A force that works against an object's motion. Geocentric (motion) Motion that is thought of considering that the Earth is the center of the universe. gravity The pull of a planet on masses. Heliocentric (motion) Motion that is thought of considering the sun as the center of the universe. Inertia The amount of resistance an object has to forces acting upon it. Kilogram A unit of mass in the metric system. Kinematics The study of motion. Kinetic friction Friction that takes place when an object is in motion. Lubricant A material that decreases friction. Magnitude the quantity of something. Mass The amount of mattar an object has. Newton A unit of weight in the metric system. Normal (force) A vertical force that supports an object and puts the object in equilibrium. Net Force The total of all the forces. Rolling Friction Friction associated with rolling objects. Scalar magnitude only. Sigma net Three Body Diagram A diagram that shows the forces acting on an object. Spring Scale A device that measures weight. Static rest Static Friction Friction that takes place when an object is at rest. Tension The act of stretching or straining. Triple Beam Balence A device used to measure mass. Unbalenced forces When the forces in one dimension are not equal and so the object is not in equilibrium. Vector Direction and magnitude. Viscosity The thickness of a fluid. Weight The amount that the earth pulls of masses because of gravity.