Physics Chapter 1
scalars - correct answer ✔quantities that have magnitude only (e.g. speed
and mass)
vectors - correct answer ✔quantities that have both magnitude and direction;
represented by arrows; the length of the arrow represents the magnitude and
the arrow points in the direction
kinematics - correct answer ✔how things move
dynamics - correct answer ✔why things move
distance - correct answer ✔the scalar length of an object's path during an
interval of time; denoted by x
displacement - correct answer ✔the vector distance and direction from an
object's initial position to its final position during an interval of time; denoted by
Δx
speed - correct answer ✔scalar that describes how fast; it is always positive
velocity - correct answer ✔the rate of change of position; it is the vector that
describes how fast and in what direction; it can be positive or negative
average velocity - correct answer ✔total displacement divided by total time
, average speed - correct answer ✔equals the total distance traveled divided
by the total time
instantaneous velocity - correct answer ✔how fast an object is moving at a
specific time
acceleration - correct answer ✔the rate of change of velocity; vector
deceleration - correct answer ✔when an object traveling in one direction
accelerates in the other direction, it slows down; negative acceleration
free fall - correct answer ✔when an object falls without any force on it but
gravity
projectile - correct answer ✔an object that is given some initial motion and
afterward acted on by the force of gravity alone
trajectory - correct answer ✔the path of the projectile
newton's first law of motion - correct answer ✔an object at rest stays at rest
and an object in motion stays in uniform motion in a straight line unless acted
upon by an unbalanced force; an unbalanced force is not canceled out by
another opposing force
mechanical equilibrium - correct answer ✔when the net force on an object is
0 N, it does not change its state of motion
scalars - correct answer ✔quantities that have magnitude only (e.g. speed
and mass)
vectors - correct answer ✔quantities that have both magnitude and direction;
represented by arrows; the length of the arrow represents the magnitude and
the arrow points in the direction
kinematics - correct answer ✔how things move
dynamics - correct answer ✔why things move
distance - correct answer ✔the scalar length of an object's path during an
interval of time; denoted by x
displacement - correct answer ✔the vector distance and direction from an
object's initial position to its final position during an interval of time; denoted by
Δx
speed - correct answer ✔scalar that describes how fast; it is always positive
velocity - correct answer ✔the rate of change of position; it is the vector that
describes how fast and in what direction; it can be positive or negative
average velocity - correct answer ✔total displacement divided by total time
, average speed - correct answer ✔equals the total distance traveled divided
by the total time
instantaneous velocity - correct answer ✔how fast an object is moving at a
specific time
acceleration - correct answer ✔the rate of change of velocity; vector
deceleration - correct answer ✔when an object traveling in one direction
accelerates in the other direction, it slows down; negative acceleration
free fall - correct answer ✔when an object falls without any force on it but
gravity
projectile - correct answer ✔an object that is given some initial motion and
afterward acted on by the force of gravity alone
trajectory - correct answer ✔the path of the projectile
newton's first law of motion - correct answer ✔an object at rest stays at rest
and an object in motion stays in uniform motion in a straight line unless acted
upon by an unbalanced force; an unbalanced force is not canceled out by
another opposing force
mechanical equilibrium - correct answer ✔when the net force on an object is
0 N, it does not change its state of motion
