Unit 1 Flashcards
_____ made observations that provided the clue to mathematically defining planetary movements, all without a telescope.
Tycho Brahe
_____ described the law of universal gravitation and even named the phenomenon.
Isaac Newton
A(n) _____ is an act designed to discover a truth.
experiment
_____ is the attractive force of two objects for each other.
gravitation
A _____ is a smaller body revolving around a larger body.
satellite
Magnitude expresses a _____.
lesser and greater amount
_____ draws an object toward a center.
centripetal force
Sunspots were first described as _____.
blemishes
_____ keeps the Moon in orbit about our planet.
centripetal acceleration
_____ was one Greek thinker who held the heliocentric view.
Heraclides
_____ built the first reflecting telescope.
Isaac Newton
_____ means to spin around an axis.
rotate
_____ is the force that causes rotation.
torque
Inertia _____.
is the resistance to change in motion
The time it takes a planet to orbit its sun varies with the planet’s _____ from it.
distance
Angular momentum measures _____.
the momentum of an object circling about some other object
the science that investigates the characteristics of all objects in space
astronomy
the theory that the Earth is the center of our universe
geocentric
the theory that the Sun is the center of our universe
heliocentric
Gravitation is inversely proportional to the _____ of the distance between any two objects.
square
The formula for calculating amount of force is _____.
force = mass x acceleration
_____ first used the telescope for astronomy, discovering mountains on the Moon.
Galileo Galilei
_____ explores all phenomena of light energy.
optics
_____ is proportional to the mass of any object.
gravitation
_____ divided the sky into degrees, minutes, and seconds to plot sky positions, measures we still use.
sumerians
The mass of one object and the mass of a second object determines the _____ between them.
force of attraction
All forces occur in pairs that are _____ to each other.
equal and opposite
_____ experimental results are valuable to know.
all
Velocity _____.
is the distance and direction traveled by a moving object in a certain period of time
Acceleration is _____.
the rate at which a change in velocity occurs
_____ held the geocentric view, which was accepted as true for over 1,500 years.
ptolemy
The _____ is the view port of a telescope.
eyepiece
_____ established the true shapes of planetary orbits.
johannes kepler
_____ draws objects away from a center.
centrifugal force
_____ means to move in a circular path.
revolve
A(n) _____ is a large, solid body that orbits a star.
planet
A _____ is a gaseous body that shines by its own light.
star
_____ had a calendar that consisted of 365 days and three seasons.
Egyptians
Change in an object’s motion is proportional to the _____ impressed or applied.
force
_____ was the first known person to invent the telescope.
hans lippershey
