Chapter Seven, Lesson One: Describing Motion

Question 1

motion

Answer 1

An object is in motion if its position changes relative to another object.

Question 2

reference point

Answer 2

A reference point is a place or object used for comparison to determine if something is in motion.

Question 3

International System of Units

Answer 3

Scientists use a system of measurement called the International System of Units or, in French, Systéme International (SI).

Question 4

distance

Answer 4

Distance is the length of the path between two points.