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11 Cards in this Set

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Galileo
Questioned laws of nature work
Built own telescope

Observations that supported heliocentric model:
-moon not perfect (mt and valley)
-Jupiter has own moons
-Sun has sunspots so sun is less than perfect, rotates about its axis
-Venus has phases and changes in angular size
Newtons first law
(Law of Inertia)
every object continues in state of rest, or uniform motion in straight line, unless it is compelled to change by forces impressed on it.
Mass
quantity of matter in an object.
weight
force upon an object due to gravity
Newton's second law
acceleration of an object is directly proportional to net force acting on the object, is in direction of the net force, and is inversely proportional to the mass of the object

F=ma

as F inc, a inc
as m inc, a dec

more mass, push w/ greater force
Newton's third law
whenever 1 object exerts a force on second object, 2nd object exerts an equal and opposite force on the first
Newton's law of universal gravitation
Gravity causes acceleration, which causes gravitational force
Force depends on mass of both objects

force that is proportional to product of masses and inversely proportional to square of the distance b/w them
Tides due to...
differences in gravitational forces across Earth.
Water on surface free to bulge with tides
High vs. Low Tides
High tide every 12 hours
Low tide every quarter turn (in b/w high tides)
Spring tides
during new moon and full moon, sun and moon exert tidal forces in same direction.
Highest high tides and lowest low tides
Neap tides
Moon is in first and last quarter, when sun and moon exert tide forces in opposite directions, work against each other.
Lowest high tides and highest low tides