Physics - Chapter 4 Vocabualry
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Flashcardsforce
a push or pull exerted on an object
system
object or objects of interest that can interact with each other and the external world
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21 Terms
force
a push or pull exerted on an object
system
object or objects of interest that can interact with each other and the external world
net force
the vector sum of all the forces on an object
weight
the gravitational force experienced by an object
gravitational field
a vector quantity that relates the mass of an object to the gravitational force it experiences at a given location
apparent weight
the support force acting on an object
Newton's third law
all forces come in pairs and that the two focuses in a pair act on different objects, are equal in strength, and are opposite in direction
tension
the specific name for the force exerted by a rope or a string
normal force
the perpendicular contact force exerted by a surface on an object
acceleration
the rate at which the velocity of an object changes
free-body diagram
a physical model that represents the forces acting on a system
Newton's second law
the acceleration of an object is proportional to the net force and inversely proportional to the mass of the object being accelerated
Newton's first law
an object at rest will remain at rest and a moving object will continue moving in a straight line with a constant speed, if and only if the net force acting on that object is zero
inertia
the tendency of an object to resist changes in velocity
equilibrium
the condition in which the net force on an object is zero
viscosity
a fluid's resistance to flowing
weightlessness
an object's apparent weight of zero that results when there are no forces supporting the object
drag force
exerted by a fluid on an object that opposes the object's motion through the fluid
terminal velocity
the constant velocity of an object that is reached when the drag force equals the force of gravity
symmetry
corresponding of parts on opposite sides of a dividing line
interaction pair
a pair of forces that are equal in strength but opposite in direction and act on different objects