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physical science wei wei test 2
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Gravity
Key Concepts:
Terms in this set (71)
pascals principle
change in pressure at any point in an enclosed fluid at rest.
principle of floatation
displaced fluid has equal weight to the weight of an object
archimedes principle
immersed body is buoyed up by force equal to weight of the fluid
each principle can be applied to
liquid and gas
weight of the earths pressure
atmospheric pressure is caused by
atomspheric pressure is
different at different altitudes
force
hydraulic press can multiply
atmospheric pressure
two people can drink from a straw because of
volume of fluid
a submerged object always displaces its
more
when submerged the buoyant force is
volume and weight of water
a fish displaces what
less
when you float in salt water, the volume of the water is.
120- tons
the buoyant force on a 120- ton ship is
alluminum
buoyant force is greatest on a submerged 1-kg block of.
iron, lead, and aluminum
buoyant force is greatest on a submerged 1-cubic centimeter of all
greater
pressure is ___________ in salt water.
true
there is no atmospheric pressure on the moon
true
buoyancy is always an upward direction
true
a hydraulic press is not a good way to multiply energy
true
pressure is not always a downward direction
density
solid, liquid, gas -how much mass an object occupies
mass
g or kg
volume
cm3 or g/cm3
more
salt water is ------- dense than fresh water
pressure
force per unit area that one object exerts on another. (Pascals)
buoyancy
loss of weight of a submerged object
boyles law
pressure and volume for ideal gases
.8
1.25
atmosphere
ocean of the air
barometer
determines atmospheric pressure
aneroid barometer
portable atmospheric pressure
constant
if satelite is in eliptical orbit, its total energy remains ________
escape speed
critical starting speed that permits a perjectile to escape earth
mass of the planet it escapes from , and the radius
escape speed depends on
less
your weight on a very tall lader would be
increase
if a radius shrunk, your weight on the shrunken surface would
acceleration of g in a downward direction
projectile motion
free falling
satelite in circular orbit
true about g
g is different at different places
g decreases as it goes higher
g is less @ the moon
90 meters from you
baseball with a speed of 45 m/s, after 2 seconds it's
45 degrees
a baseball would reach the max range when the tossing angle is horizontal at
projectile motion
constant acceleration in verticle direction
constant speed in vertical direction
constant acceleration of g
motion of satelite
a projectile motion
gravity force
the satelite orbits around the earth because of
if the satelite is in circular orbit
- kinetic energy remains constant
- potential energy remains constant
- gravity forvce is perpendicular to direction of motion
8000 m/s
to follow earth, a satelite must have a speed of ____ in horizontal direction
quadruples
if distance decreases to half, force between the two ______
grip of earths gravity
when an astrounout is weightless it is in.
universal
newton discovered that gravity is
newton gravitational law
every mass pulls on every other mass
newtons most celebrated sythensis is
earthly and heavenly laws
inverse square law-
intensity of an effect to the inverse square of the distance from the cause
greater distance
less gravitational force
G
universal gravitational constant
weight
force exerted against a supporting table of weighing scale
weightlessness
no support force
projectile
object that moves through the air under influence of gravity
parabola
curved path of the projectile
projectile motion
horizontal and vertical
on projectiles with air resistance
range and altitude are decreased
satelite
any projectile moving fast enough to fall continually around the earth
curvature
earths _______ drops 5m every 8000 m
ellipse
oval path followed by a satelite
elliptical orbit
speed of satelite varies
8m/s
if an elliptical orbit exceeds _______ it overshoots a circle
escape velocity
escape speed when direction is involved
pioneer 10
first probe to escape earths solar system in 1972
the iss
circles 360 km above earth
kinetic energy
energy object has due to mass and velocity ( moving object)
potential energy
energy an object has due to position
joules
energy
KE + PE
_________ is constant along an elliptical orbit
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