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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