module 9 Flashcards
What is the science that analyzes weather fronts, winds, humidity, and cloud cover?
meteorology
What is the science concerned with the nature and properties of matter and energy. The subject matter of physics includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms.
physics
The branch of physics that deals with analyzing and understanding objects in motion is called what?
mechanics
If you want to study the motion of an object, the first thing you need to know is what?
You need to know the object’s position.
Position must always be given _____________to something else. That “something else” is usually called the _____________________.
relative; reference point.
What is reference point?
A point against which position is measured.
What is speed?
how fast an object is going.
What is velocity?
that’s speed and direction.
What is a vector quantity?
a physical measurement that contains directional information.
What is scalar quantity?
A physical measurement that does not contain directional information.
Is 125 mph a vector or scalar quantity?
scalar
Is 35 mph due west a vector or scalar quantity?
vector
When objects travel in the same direction, how do you calculate their relative speed?
speed 1 - speed 2= relative speed
When objects travel in the opposite direction, how do you calculate their relative speed?
speed 1 + speed 2= relative speed
What is acceleration?
The time rate of change of an object’s velocity.
Simply put: change in speed or direction.
