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27 Cards in this Set
- Front
- Back
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Force |
A push or a pull on an object |
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Contact Force |
a push or a pull on one object by another that istouching it
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Non contact Force |
A force that one object can apply to another object withouttouching
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Gravity |
an attractive force that exists between allobjects that have mass
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Mass |
the amount of matter in an object
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The Law of Universal Gravitation |
all objects areattracted to each other by a gravitational force. The strengthof the force depends on the mass of each object and thedistance between them
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Gravitational Force and Mass
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When themass of one or both objects increases, the gravitational forcebetween them also increases.
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Gravitational Force and Distance
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The attraction betweenobjects decreases as the distance between the objects increases.
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Weight |
the gravitational force exerted on an object.
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Friction |
a force that resists the motion of two surfaces that aretouching.
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Static Friction |
prevents surfaces from sliding past eachother
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Sliding Friction |
opposes the motion of surfaces slidingpast each other
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Fluid Friction |
is friction between a surface and any material that flows.
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Net Force |
The combination ofall the forces acting on an object
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Balanced Forces |
Forces acting on an object that combine and form a net force ofzero
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Unbalanced Forces |
Forces acting on an object that combine and form a netforce that is not zero
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Newton's First Law of Motion |
if thenet force on an object is zero, the motion of the object does not change.
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Inertia |
The tendency of anobject to resist a change in its motion
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Newton's Second Law of Motion |
theacceleration of an object is equal to the net force acting on the objectdivided by the object’s mass.
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Circular Motion |
any motion in which an object is movingalong a curved path.
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Centripetal Force |
a force that acts perpendicular to thedirection of motion, toward the center of the curve
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Newton's Third Law of Motion |
when one object exerts a force on asecond object, the second object exerts a force of the same size but in theopposite direction on the first object
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Force Pair |
the forces two objects apply to each other
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Momentum |
ameasure of how hard it is to stop a moving object.
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Momentum Equation |
(in kg •m/s) = mass (in kg) × velocity (in m/s) p = m × v |
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Momentum and Mass |
The more mass an object has, the harder it is to stop |
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Law of Conservation of Momentum |
the totalmomentum of a group of objects stays the same unless outside forcesact on the objects
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