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26 Cards in this Set

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  • Back
equilibrium rule
∑F=0
(sigma 'f'equals zero)
force
a push or a pull
inertia
the tendency of things to remain at rest if at rest, and in motion if in motion
net force
the combination of all forces that act act on an object
Newton
the scientific unit of force
Newton's first law
Every object continues in a state of rest or a state of motion in a straight line at a constant speed, unless it is compelled to change that state by forces exerted upon it.
speed
the distance traveled per time
support force
the force that supports an object against gravity
vector quantity
a quantity that specifies direction as well as magnitude
velocity
the speed of an object and specification of its direction of motion
acceleration
the rate at which velocity changes with time; the change may be in magnitude, direction or both
air drag
frictonal resistance due to motion through air
free fall
motion under the influence of gravitational pull only
friction
the resistive force that opposes the motion or attempted motion of an object past another with which it is in contact, or through a fluid
inversely
When two values change in opposite directions, so that if one increases and the other decreases by the same amount, they are said to be inversely proportional to each other.
kilogram
the fundamental SI unit of mass; one kilogram (symbol:kg) is the mass of 1 liter(l) of water at 4°C.
Newton's second law
The acceleration produced by a net force on an object is directly proportional to the net force, is in the same direction as the net force, and is inversely proportional to the mass of the object.
mass
the quantity of matter in an object; more specifically, it is the measure of the inertia or sluggishness that an object exhibits in response to any effort made to start it, stop it, deflect it, or change in any way its state of motion.
terminal speed
the speed at which the accerleration of a falling object terminates because air resistance balances its weight
terminal velocity
terminal speed with directon of motion (down for falling objects)
volume
the quantity of space an object occupies
weight
the force due to gravity on an object
inertia
the tendency of things to resist change in motion
force pair
the action and reaction pair of forces that occur in an interaction
interaction
mutual action between objects where each object exerts an equal and opposite force on the other
Newton's third law
Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first, or put another way, "to every action, there is always an opposed equal reaction"