# 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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