1.1 The Language Of Motion Flashcards
What is kinematics?
A branch of physics that describes motion
Kinematics focuses on the motion of objects without considering the forces that cause the motion.
What is the significance of using clearly defined terms in kinematics?
It ensures accurate communication of motion concepts
Clear definitions help avoid confusion in scientific discussions.
Fill in the blank: Kinematics is the branch of physics that describes _______.
[motion]
What is the origin in the context of motion?
A reference point
How is position defined?
The straight-line distance between the origin and an object’s location; includes magnitude and direction
What is a scalar quantity?
A measurement that has magnitude only
What is a vector quantity?
A measurement that has both magnitude and direction
If a player is located 5.0 m from the origin heading East, how is this position expressed?
5.0 m (E)
What does the arrow over the variable in the position expression indicate?
That the variable is a vector quantity
What is the term for the number and unit associated with a vector?
Magnitude of the vector
What is distance classified as in terms of quantity?
A scalar quantity
True or False: Position is an example of a scalar quantity.
False
What is distance?
The length of the path taken to move from one position to another
Distance does not consider direction.
Define displacement.
The change in position; a straight line between initial and final positions, including magnitude and direction
Displacement is typically denoted as Δd–>.
How is displacement written in notation?
Δd–> = 20.0 m (E)
‘Δd’ represents the change in position.
How do you calculate the change in a quantity?
By subtracting the initial quantity from the final quantity
In algebraic notation, ∆x = xf - xI.
Calculate the player’s displacement given the final and initial positions, respectively: 25.0 m [E] and 5.0 m [E].
20.0 m [E]
Displacement is calculated as ∆d–> = 25.0 m [E] - 5.0 m [E].
What do graphs and equations describe in motion?
Motion in one dimension
This is fundamental to understanding kinematics.
What are radar vectors used for?
Instructions to fly in a particular direction, including altitude and speed restrictions
Pilots commonly use radar vectors during landing.
What method will you be using for all subsequent problems in this book?
Plus and minus signs to indicate direction
What is speed?
The rate at which an object moves
Is speed a scalar or vector quantity?
Scalar quantity
What is an example of speed?
v = 50 km/h
What is velocity?
A vector quantity that has both magnitude and direction
If you are traveling south at 50 km/h, how is your velocity written?
v–> = 50 km/h [S]
If south is designated as negative, how is the velocity expressed?
v–> = -50 km/h
What is acceleration?
A vector quantity that represents the rate of change of velocity
