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Physics Crossword

velocity
rate of motion in a particular direction

motion
movement of an object

acceleration
increase in speed

inertia
state of rest, or motion in a straight line

Galilei Galileo
Italian physicist and astronomer, 1564-1642; found all objects fell at the same rate of speed in a vacuum

Sir Isaac Newton
English physicist, mathematician, and philosopher, 1642-1727; his synthesis is said to be “the first revolution of physics”; showed the moon is held in its orbit by the Earth’s gravity

mathematics
major tool of physics

Nicolaus Copernicus
astronomer who concluded the sun was the center of the universe; Polish astronomer, 1473-1543

Third Law of Motion
for every action there is an equal and opposite reaction

Aristotle
ancient Greek philosopher, 384-322 BC

calculus
type of mathematics developed by Newton and others

Albert Einstein
German-American physicist, 1879-1955; his theory showed that gravity affects light

mass
total quantity of an object’s matter

gravity
universal force of the attraction of all objects

friction
resistance to the motion of an object

First Law of Motion
called the “principle of inertia”

force
to a physicist the only forces in nature are gravity, electromagnetism, and the weak and strong nuclear force. Einstein and others believed these were different aspects of the same force

four-dimensional universe
Einstein showed that the universe had length, width, height, and time

Johannes Kepler
German astronomer and mathematician, 1571-1630

rate of acceleration
the change in the velocity of the motion of an object

Second Law of Motion
describes how an object changes direction when a force is applied to it. The formula that expresses it is: F=ma (applied force equals mass times acceleration)

space-time
Einstein showed that space and time were similar and that both were influenced by gravity

Three Laws of Motion
laws that govern the movement of all objects, at all times, and in all circumstances. These laws were formulated by Newton

vector analysis
the analysis of different forces on an object resulting in the calculation of net force

velocity
the rate of motion in a particular direction. The formula that expresses it is: v=gt (velocity equals acceleration multiplied by time)

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