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in science a theory is
a synthesis of a large body of well tested knowledge
technology is
mainly a tool of science
galileo relied on
experiment
galileoâs demonstration at the leaning tower of pisa
refuted aristotleâs teachings
according to galileo inertia is
property of all matter
1 kg block of iron weighs about
10 N
kilogram is
unit of mass
compared with the mass of an apple on earth, the mass of the same apple on the moon is
the same
your weight is
the gravitational attraction between you and earth
the net force on an object is
the combination of all forces acting on it
the equilibrium rule ÎŁF = 0 applies to
both objects at rest and object in uniform motion in a straight line
a parachutist falling at a constant velocity is in a state of
dynamic equilibrium
the friction forces between one object and another act
in opposite directions
a glance at your speedometer on your vehicle will tell you your
instantaneous speed
acceleration and velocity are
very different from each other
when a ball increases in speed by the same amount each second its acceleration
is constant
as an object freely falls its
velocity increases
the speed of a vertically thrown ball at the top of its path is
zero
inertia is defined as
property of matter
if gravity between the sun and earth suddenly vanished, earth would move in
a straight line path
the net force on any object moving at constant velocity
zero
youâre in a fast moving train traveling at a constant velocity. if you just straight up you land
at your original position
newtonâs second law focuses on
acceleration
a given net force propels an object along a straight line path. if the mass were doubled, its acceleration would
be half
a heavy rock and a light rock in free fall have the same acceleration because of the
ration of force to mass is the same
how many forces act on an upwardly tossed coin when it gets to the top of its path
one - the force due to gravity
when a falling object has reached its terminal velocity, its acceleration is
zero
action and reaction forces are parts of
a single interaction
the distinction between impulse and force involves the
time the force acts
whereas impulse involves the time that a force acts, work involves the
distance that a force acts
an object that has kinetic energy must be
moving
power is defined as the
work done divided by the time to do the work
a ball rolling down an incline has its maximum potential energy
at the top
a ball rolling down an incline has its maximum kinetic energy
at the bottom
according to newton, the greater the masses of interacting objects
the greater the gravitational force between them
if your mass doubles you weight
also doubles
an object is placed exactly halfway between the earth and the moon, the object will fall towards the
earth
inside a freely falling elevator your
weight is zero
air resistance on a high speed projectile shortens its
both range and maximum height
what holds earth satellites up so they donât crash into earth
nothing, they continually fall fast enough around earth not to crash
Note 
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