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The Nature of Forces

Forces

DefinitionTerm
founder of modern physics isaac newton
a push or pull force
anything that can change the motion of a body force
newton is the unit for force
if a body begins to move a force has acted
if a body slows down a force has acted
if a body changes direction a force has acted
to find the total force when two forces are acting in the same direction add the forces
to find the total force when two forces are acting in the oppoite direction subtract the smaller force from the larger force
forces that are in opposite direction and equal in size are called balanced forces
can not change the motion of a body balanced forces
can change the motion of a body unbalanced forces
the force that opposes the motion of a body friction
type of surface one factor determing amount of friction
weight of body on a surface one factor determing amount of friction
friction produced by objects such as wheels or ball bearings is called rolling friction
friction produced by objects moving across each other is called sliding friction
friction produced by an object moving through the air or through water is called fluid friction
the tendency of objects to remain in motion or stay at rest inertia
an object at rest will remain at rest and an object in motion will remain in motion at constant velocity unless acted upon by an unbalanced force newton's first law of motion
an object moving in a straight line will continue moving in a straight line because of inertia
an unbalanced force acting on a body will cause it to accelerate
the greater the force acting upon a body, the _____ the acceleration larger
under a given force, the greater the mass of an object, the _______ the acceleration smaller
unit for acceleration m/s^2 (meters per second squared)
for every action, there is an equal and opposite reaction newton's third law of motion
all objects in the universe attract all other objects newton's law of universal gravitation
the greater the distance between two bodies, the ______ the attraction between them smaller
the greater the mass of two object, the ______ the attractive force between them greater
rate of acceleration of gravity on earth 9.8 m/s^2 (meters per second squared)
when a falling body no longer accelerates, it has reached its terminal velocity
when the force of gravity and the air resistance are equal termingal velocity will occur
a measure of the force of gravity on an object weight
amount of matter in a body mass
increasing the mass of a body causes the weight to ______ increase
increasing the acceleration of gravity, causes the body's weight to _____ increase
the weight of a body can change, but the mass is _________ constant
the formula for calculating weight is w = mg
_______ is constant; _______ can change mass, weight
force is a push; a pull; the ability to change motion
forces that are opposite and equal are called balanced
the force that opposes motion of an object is called friction
the type of friction that exists for a shark swimming in the ocean is fluid
the property of matter that resists a change in motion is inertia
according to newton's second law of motion, force equals mass X acceleration
the force of attraction that exists etween all objects in the universe is gravity
a change in the force of gravity pullin on you will change your weight
"slippery"substances such as oil, wax, and greases that reduce friction are called lubricants
in a vacuum, a heavier object will fall to earth _______ than a lighter object faster than
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