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31 Cards in this Set
- Front
- Back
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What is kinematics?
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how objects move
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What is dynamics?
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the study of why obects move as they do
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Newton's laws of motion
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The connection between acceleration and its cause
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What is a force?
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a push or a pull
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What are the four forces generally accepted by physicists?
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gravitational, electromagnetic, strong nuclear, and weak forces
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Newton's First Law
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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) |
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What is a gravitional force?
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an attractive force that exists between all objects
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What is an electromagnetic force?
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the forces that give materials their strength, their ability to bend, squeeze, stretch, or shatter
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What is a strong nuclear force?
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holds the particles in the nucleus together
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What is a weak force?
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a form of electromagentic force, and is involved in the radioactive decay of some muclei.
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What is Grand Unification Theories (GUTs) and Supersymmetric Theories
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could prove that all forces are different aspects of a single force.
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Newton's Second Law
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the acceleration of a body is directly proportional to the net force on it and inversly proportional to its mass
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Newton's Second law Summarized
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acceleration=net force/mass
a=F/m or F=ma |
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Newtons 3rd Law
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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.
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The magnitudes of a ______ is always equal.
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action-reaction force
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The weight of an object is proportional to its mass. True or False
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True
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Weight is electromagnetic force of an object.
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False, gravitational force
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What is Inertial mass?
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the ratio of the net force exerted on the object and its acceleration (mass=net force/acceleration or m=F/a)
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What are the two kinds of masses?
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Inertial mass and
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Forces always appair by themselves.
True or False? |
False, in pairs
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Forces are vectors.
True or False? |
True
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What is weight?
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the gravitational force exerted by a large body, usually Earth
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Friction is (perpendicular/ parallel) to the surface and (opposes/ concurs with) the slipping of the two objects.
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parallel, opposes
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What is Static Friction?
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the force that opposes the start of motion (if the twoobjects are not in motion)
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What is Sliding Friction?
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The force between surfaces in relative motion.
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Sliding Friciton>Static Friction
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False, <
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What is F sub A?
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applied force (the force you exert)
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What is F?
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Net Force (the total force)
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What is F sub f?
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Frictional Force (the force of friction)
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What is a mu?
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the coefficient of friction (a constant that depents on the two surfaces in contact.
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What is F sub N?
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The normal force (the force perpendicular to its surface).
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