M3-4: Scalar & Vector Quantities and Motion Flashcards
The sum of two or more vectors is called
resultant vector
is defined as a change in position with respect to a frame of reference.
motion
An object is _________ if its position relative to a fixed point is changing. Even things that appear to be at rest move.
moving
is usually described as the total path length
Distance
is usually described as the total path length
Distance
It is a scalar quantity, which means that distance is expressed as magnitude only.
Distance
on the other hand, is the measure of how far an object has moved in a particular direction from its original position.
Displacement
Distance
Displacement
is a vector quantity. This means that displacement is expressed as magnitude with the corresponding direction.
Displacement
is how fast an object is moving.
speed
is speed in a given direction.
velocity
Constant velocity means both constant s_____ and constant d______
constant speed and constant direction
Constant direction is a _________- line, so constant velocity means motion in a straight line at constant speed
straight
If either the speed or the direction (or both) is changing, then the velocity is
changing velocity
the rate at which the velocity is changing
acceleration
applies to decreasing or increasing velocity.
acceleration
is negative acceleration
deceleration
The following should be noted when analyzing acceleration problems:
When the object starts from rest, its initial velocity is z____.
When the object comes to stop, its final velocity is z_____.
When the object starts from rest and moves, its acceleration is p_____.
When the object is already moving then stops, it acceleration is n_______.
The following should be noted when analyzing acceleration problems:
When the object starts from rest, its initial velocity is zero.
When the object comes to stop, its final velocity is zero.
When the object starts from rest and moves, its acceleration is positive.
When the object is already moving then stops, it acceleration is negative.
always refers to acceleration in the direction opposite to the direction of the velocity.
Deceleration
always reduces speed.
Deceleration
, is acceleration in the negative direction in the chosen coordinate system
negative acceleration
occurs when an object’s velocity changes by an equal amount in every equal time.
Constant acceleration
