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.