Chapter 2
zero
A car traveling with negative velocity slows to a stop. Its acceleration is
negative
A car traveling with negative velocity speeds up. Its acceleration is
zero
A car traveling with positive velocity slows to a stop. Its acceleration is
positive
A car traveling with positive velocity speeds up. Its acceleration is
either speed and direction or both
A change in velocity means a change in
rate
Any change over time is called a _____
dividing total distance traveled by the total time
Average speed is found by __________.
List knowns and unknowns State formula Solve algebraically for unknown (if necessary) Plug in values State answer in correct units
Calculating Velocity: Steps:
no
Can the size of an object's displacement ever be greater than the distance the object travels?
yes
Can the size of an object's displacement ever be less than the distance the object travels?
vector
Displacement is a ____ quantity; does include direction.
scalar
Distance is a ________ quantity; does not include direction.
increases
If the acceleration is in the same direction as the velocity, the speed _________.
constant slope
If the object is moving with constant speed it is represented by a line with a
constant speed
If the object neither slows down nor speeds up, the object is traveling at a
decreases
If the speed _______, the acceleration is the in opposite direction from the velocity.
slope
If the speed of an object changes, its ______ will change as well.
no
If the speedometer on a car indicates a constant speed, can you be sure the car is not accelerating?
positive
If the velocity is negative, ________ acceleration will decrease the object's velocity.
increase
If the velocity is positive, positive acceleration will ______ the object's velocity
acceleration
Just as speed is the rate of change of position, ______ is the rate of change of velocity.
position
Motion occurs when an object changes its __________.
speed time distance
Scalar:
meter
The SI unit of distance is the __________.
meter (m)
The SI unit of length or distance is the ___.
position
The distance between an object and a reference point is the object's __________.
displacement
The distance between the final position and the starting position is the __________.
distance-time graph
The motion of an object over a period of time can be shown on a _______.
Distance
describes how far an object has moved
frame of reference
is a coordinate system in which the position of the objects is measured.
reference point
is needed to determine the position of an object.
Velocity
is the change in position (which is displacement) per unit of time.
Speed
is the distance an object travels per unit of time.
displacement
is the distance and direction of the object's change in position from the starting point
Instantaneous Speed
is the speed at a given point in time.
Average Speed
is the total distance traveled divided by the total time of travel.
displacement acceleration velocity
vector
horizontal, vertical
Time is plotted along the _______ axis and distance traveled is plotted on the _________ axis.
velocity
When an object changes direction, its _____ (not necessarily its speed) changes.
changing
When something is speeding up or slowing down, its instantaneous speed is _____
speedometer
Which of the following devices is used to indicate instantaneous speed?
v=d/t
Which of the following equations is used for calculating speed?
m/s2 k/m2
Which of the following is a proper unit of acceleration? Choose all that apply.
m/s k/m
Which of the following is a proper unit of velocity
speed
___ is the rate at which distance is traveled
Speed
__________ is the distance an object travels per unit of time.
Instantaneous Speed
__________ is the speed of an object at any instant of time.