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### 31 Cards in this Set

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 What is kinematics? how objects move What is dynamics? the study of why obects move as they do Newton's laws of motion The connection between acceleration and its cause What is a force? a push or a pull What are the four forces generally accepted by physicists? gravitational, electromagnetic, strong nuclear, and weak forces Newton's First Law an objects with no force acting on it with constant velocity (if there is no net force on an object there is no acceleration, constant velocity) What is a gravitional force? an attractive force that exists between all objects What is an electromagnetic force? the forces that give materials their strength, their ability to bend, squeeze, stretch, or shatter What is a strong nuclear force? holds the particles in the nucleus together What is a weak force? a form of electromagentic force, and is involved in the radioactive decay of some muclei. What is Grand Unification Theories (GUTs) and Supersymmetric Theories could prove that all forces are different aspects of a single force. Newton's Second Law the acceleration of a body is directly proportional to the net force on it and inversly proportional to its mass Newton's Second law Summarized acceleration=net force/mass a=F/m or F=ma Newtons 3rd Law when one object exerts a force ona second object, the second object exerts a force on the first that is equal in magnitude but opposite in direction. The magnitudes of a ______ is always equal. action-reaction force The weight of an object is proportional to its mass. True or False True Weight is electromagnetic force of an object. False, gravitational force What is Inertial mass? the ratio of the net force exerted on the object and its acceleration (mass=net force/acceleration or m=F/a) What are the two kinds of masses? Inertial mass and Forces always appair by themselves. True or False? False, in pairs Forces are vectors. True or False? True What is weight? the gravitational force exerted by a large body, usually Earth Friction is (perpendicular/ parallel) to the surface and (opposes/ concurs with) the slipping of the two objects. parallel, opposes What is Static Friction? the force that opposes the start of motion (if the twoobjects are not in motion) What is Sliding Friction? The force between surfaces in relative motion. Sliding Friciton>Static Friction False, < What is F sub A? applied force (the force you exert) What is F? Net Force (the total force) What is F sub f? Frictional Force (the force of friction) What is a mu? the coefficient of friction (a constant that depents on the two surfaces in contact. What is F sub N? The normal force (the force perpendicular to its surface).