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Physics-Chapter 3-Test

Terms in this set (59)

magnitude
a number, and a amount and value
scalar quantity
these are quantities that only include or have magnitude (number amount)
vector quantity
these quantities include or have magnitude and direction
distance
the length of a path from the start point to end point
displacement
the length of a straight line from start to finish with direction
speed
a ratio of the distance to the time
is distance a scalar or vector quantity
scalar
is displacement a scalar or vector quantity
vector
is speed a vector or scalar quantity
scalar
is average speed a vector or scalar quantity
scalar
is instantaneous speed a scalar or vector quantity
scalar
is velocity a vector or scalar quantity
vector
why is distance a scalar quantity
because it only tells you what the number amount is, it doesn't tells you the direction its going
why is speed a scalar quantity
because it only tells you what the number amount is, it doesn't tells you the direction its going
why is average speed a scalar quantity
because it only tells you what the number amount is, it doesn't tells you the direction its going
why is instantaneous speed a scalar quantity
because it only tells you what the number amount is, it doesn't tells you the direction its going
why is displacement a vector quantity
because it shows the number amount (magnitude) and the direction the object is moving or traveling
why is velocity a vector quantity
because it shows the number amount (magnitude) and the direction the object is moving or traveling
what is the formula for finding speed
speed=distance/time
what is the formula for finding average speed
average speed=td/tt
ratio
a statement of how two numbers compare
direct porportion
a relationship in which the ratio of two variables is constant
what is this an example of . . .
a. when the manipulated (E-M-I) variable increases too
b. when the manipulated variable decreases the responding (R-D) variable decreases too
direct proportion
inverse porportion
as the manipulated (E-M-I) variable increases the responding variable decreases etc. The proportion is opposite
what are examples of relationships
direct and inverse proportions
how do you do determine if motion is occurring
In order to determine if something is moving you must compare it to a frame of reference
frame of reference
a system of objects that are not moving with respect to one another
what are three things necessary to describe motion
1. the direction of the object
2.how fast the object is moving
3. the location of the object
revelation motion
the movement in respect to a frame of a reference
is it possible to examine different properties or types of motion, or time etc. and place these into categories based on certain criteria
yes
what is the physical property classification based on
if it can be measured or observed without changing the atoms of which it is composed it is a physical property
what are 2 types of quantities
scalar and vector
what is the vector quantity represented by
is represented by an arrow whose length represents the magnitude of a quantity and whose direction represents the direction of the quantity
in the vector quantity what does the length of the arrow represent
the magnitude of the vector
how do you solve a vector quantity when the vectors combine by vector addition, vectors that are in the same direction
you add the magnitudes
when solving a vector quantity what do you do when vectors that are in opposite directions
you subtract the magnitudes
rate
a quantity measured with respect to another quantity
what is a ratio in which the two variables are different quantities with different units
rate
what usually in physics rates are anything over time
rate
what can be used to denote frequency
rate
linear motion
a motion in a straight line
what do you need to know to find the speed of the motion
the time the object took and the distance it covered.
when does motion occur
when a FORCE of some kind is being applied
instantaneous speed
the speed at the moment, the RATE at which an object is moving at a given moment in time
what is an example of instantaneous speed
the speed on a speedometer
average speed
is the total distance traveled divided by the total time. It is the speed computed for the entire duration of the trip
whats a good way to display motion
a distance tim graph
on a distance time graph what is used to record the speed
a slope of a line
what is the formula for slope
rise/run or y/x
on a distance time graph whats on the y axis
distance
on a distance time graph whats on the x axis
time
velocity
it is the speed with direction
resultant vector
it is the sum of two or more vectors
linear motion
motion in a straight line
what are two words that are interchangeable
velocity and speedd
what is an object doing always doing when its moving
speeding in some direction (velocity)
what if the direction is not included in our description of the object what do we describe it as
we just describe it as the speed of an object.
what is the formula for distance
speed x time
what is the formula for time
distance/time
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