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### 41 Cards in this Set

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 What is a force? It is a push or pull that can cause a change in the motion of an object. What is impulse? It is the product of the amount of force on an object and the time during which the force is applied. What does the impulse-momentum theorem state? It states that an impulse causes a change in momentum. What kind of relationship do values when they are inversely proportional? They have a relationship in which one value increases while the other decreases. What is an isolated system? It is a collection of matter that doesn't interact with anything else in the universe. What is mass? It is the quantity of matter in an object? What is momentum? It is the product of mass and velocity. What does Newton's Third Law of Motion state? It states that when an object exerts a force on a second object, the second object exerts back on the first that is equal to, and opposite in direction from, the original force. What does rebound mean? It means to bounce off. What is a vector? It is a quantity that has both magnitude and direction. What is velocity? It is an object's displacement divided by the time it takes to move that amount. What is a compound machine? It is two more simple machines combined into a single device. What is efficiency? It is the ratio of a machine's output work to its input work, expressed as a percentage. What is horsepower? It is power equivalent to that of one horse, or 746 watts. What is an inclined plane? It is a flat surface, at an angle to the horizontal. What is input force? It is the force applied to the machine by its user. What is a lever? It is a bar, beam, or road that pivots around a fixed position. What is mechanical advantage? It is the ratio of a machine's output force to its input force. What is output force? It is the force applied by the machine. What is a pulley? It is a wheel with a grooved edge for holding a rope, a chain, or a cable. What is a scalar? It is a quantity that has a magnitude but no direction. What is a screw? It is an inclined plane wrapped around a cylindrical post. What is a watt? It is the standard unit of power, equivalent to doing one Joule of work each second. What is weight? It is the force of gravity acting on an object. What is a wheel and axle? It is a lever that rotates around a center point, or fulcrum. What is work? It is the product of a force on an object and the object's resulting displacement. What is chemical energy? It is energy stored in the bonds between atoms in molecules. What is a conservative force? It is a force whose effects are the same regardless of the path the object takes. What is electrical energy? It is energy that can be carried by moving electrons in an electric conductor. What is energy? It is the capacity to do work. What is kinetic energy? It is energy an object possesses because of its motion. What does the Law of Conservation of Energy state? It states that energy cannot be created or destroyed, though it may be transformed from one form to another. What does the Law of Conservation of Momentum state? It states that, in an isolated system, the total momentum before a collision equals the total momentum after a collision. What is mechanical energy? It is energy an object possesses because of its motion or position. What is a nonconservative force? It is a force whose effects depend on the path taken by the object. What is nuclear energy? It is energy released when the nuclei of atoms are changed. What is potential energy? It is stored energy that can be converted to other forms. What is radiant energy? It is energy that is released by atoms that absorb energy from an outside source. What is speed? It is the rate of change of distance? What is thermal energy? It is the energy of moving or vibrating molecules. What does the work-energy theorem state? It states that when a net force does work on an object, the object's kinetic energy changes.