Unit 1

Question 1

astronomy

Answer 1

a combination of a number of scientific disciplines that attempt to understand the universe and the objects in it

Question 2

heliocentric

Answer 2

the idea that the planets, including the Earth, revolve around the Sun

Question 3

geocentric

Answer 3

the idea that the planets and the Sun revolve around the Earth

Question 4

science

Answer 4

the body of knowledge and a method of how we learned that knowledge

Question 5

Kepler’s First Law

Answer 5

The orbit of a planet about the Sun is an ellipse with the sun at one focus.

Question 6

Kepler’s Second Law

Answer 6

A line joining a planet and the Sun sweeps out equal areas in equal intervals of time.

Question 7

Kepler’s Third Law

Answer 7

The square of a planet’s sidereal period around the Sun is directly proportional to the cube of the length of its orbit’s semi-major axis.

Question 8

gravity

Answer 8

the force of attraction between all objects that have mass

Question 9

Newton’s First Law of Motion

Answer 9

an object will move at the same velocity unless an outside force acts upon it

Question 10

Newton’s Second Law of Motion

Answer 10

the force acting on an object is equal to the object’s mass times the acceleration it undergoes

Question 11

Newton’s Third Law of Motion

Answer 11

for every action, there is an equal and opposite reaction.

Question 12

scientific notation

Answer 12

mathematical expression used to represent a decimal number between 1 and 10 multiplied by ten, so you can write large numbers using less digits