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Gravity
Terms in this set (53)
net force
two or more forces combined
balanced forces are forces that are
equal in size and opposite in direction
unbalanced forces
when two or more forces combine to produce a net force that is not zero
unbalanced forces change
velocity
friction
the force that opposes the sliding motion of two surfaces that are in contact
the size of the frictional force depends on the
materials that the surfaces are made of
static friction
the frictional force that sliding two surfaces in contact from sliding past each other
sliding friction
the force that acts in the opposite direction to the motion of a surface sliding on another surface
air resistance
the frictional force that opposes the motion of the object that moves through the air
air resistance acts in the direction
opposite to the velocity of an object moving in air
the size of the air resistance depends on the
size and shape of an object
motion
change in position
position depends on
a reference point
Displacement
the distance and direction of an objects final position from its initial position
vector
includes both size and direction
speed (d/t)
the distance an object travels per unit of time
instantaneous speed
an objects speed at a single instant of time
average speed
the total distance traveled divided by the total travel time
velocity
the speed of the object and it's direction
velocity is a
vector because it has size and direction
acceleration
the change in velocity divided by the time for that change to happen (Vf-Vi/time)
force
push or pull that one object exerts on another
force is a
vector
the SI unit for force is a
Newton (N)
if a net force on an object is zero
the object remains at rest
if the object is moving
it will continue to move in a straight line with constant speed
if the forces acting on an object are unbalanced
then the velocity of the object does not change
only balanced forces change
velocity
inertia is the
tendency of an object to resist a change in its motion
the greater the mass of an object
the greater it's inertia
the acceleration of an object
is in the same direction as the net force on the object
the formula for acceleration is
force=mass•acceleration (f=ma)
gravity
the attractive force between any two objects
gravity depends on the
masses of the objects and the distance between them
on earth the acceleration of an object in free fall is
9.8 m/s^2
the symbol for gravitational acceleration is
g
since f=ma and the gravitational acceleration is g
we can say that f=mg
weight
the gravitational force exerted on an object
the weight of an object is
equal to the gravitational force so w=mg
weight and mass are
NOT the same
weight is a measure of
force
mass is a measure of
matter
projectiles follow a
curved path
centripetal force
acceleration toward the center of a curved or circular path
the third law of motion describes
action-reaction pairs
for every action
there is an equal and opposite reaction
action and forces do not
cancel
the momentum of an object is a product of its
mass and velocity
momentum's symbol
p
the equation to find momentum
p=mv
if a group of objects exerts forces only on each other
their total momentum doesn't change y
momentum can be
transferred from one object to another
when once object exerts a force on a second object, the second one exerts force on the first object that is
equal is strength and opposite in direction
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