# General Physics (exam 1)

## Terms

copy deck
T or F
the IS of units provides units of measurements for all purposes
true
What is the basic unit of length?
m
NAME
its basic unit is m
length
NAME
m =
meters
What is the symbol for meters?
m
What is the basic unit for mass?
kg
NAME
its basic unit is kg
mass
What does kg stand for?
kilogram
What is the symbol for kilogram?
kg
What is the basic unit of time?
s
NAME
its basic untit is s
time
What is the basic unit of electric current?
A
NAME
its basic unit is A
electric current
What does A stand for?
ampere
What is the symbol for A?
ampere
What is a mole?
is the amount of a substance
NAME
this refers to the amount of a substance
mole
What is the symbol for mole?
mol
What does mol stand fro?
mol
What does K stand for?
Kelvin
What is the symbol for K?
kelvin
What is the base unit of thermodynamic temperature?
K
NAME
is base unit is K
thermodyanmic temperature
What does the symbol cd stand for?
candela
What is the symbol for candela?
cd
What is the base unit of luminous intensity?
cd
NAME
its base unit is cd
luminous intensity
How do u find speed?
distance/ divided by time
NAME
you find this by distance/time
speed
what is the base unit of speed?
m/s
NAME
its base unit is m/s
speed
How do u find density?
mass/vol
NAME
you can find this by mass/vol
density
What is the base unit for density?
kg/m3
NAME
its base unit is kg/m3
density
What is G's prefix?
giga
NAME
its prefix is giga
G
What is the prefix for M?
mega
NAME
its prefix is mega
M
What is the prefix for k?
kilo
NAME
its prefix is kilo
k
NAME
its prefix is milli
m
What is the prefix for u?
micro
NAME
its prefix is u
micro
What is the prefix for n?
nano
NAME
its prefix is nano
n
What value does G have?
10^+9
NAME
this has a value of 10^+9
G
What value does M have?
10^+6
NAME
this has a value of 10^+6
M
What value does k?
10^+3
NAME
this has a value of 10^+3
k
What value does m?
10^-3
NAME
this has a value of 10^-3
m
What value does u have?
10^-6
NAME
this has a value of 10^-6
u
What value does n have?
10^-9
NAME
this has a value of 10^-9
n
1 m = (1)
100 cm
1 (1)= 100 cm
m
NAME
this is the science of matter and interactions
physics
NAME
are influences that act btwn things
interactions
Where does the word physics come from?
the greek word physis for nature
NAME
this comes from the greek word physis for nature
physics
What do physicists want to do?
know how nature works
T or F
physics can be done w out mathmatics
false
What are (3) steps to doing physics?
(1)seek simplicity (2)do experiments (3)use math
What do interactions involve? (4)
(1)forces (2)feilds (3)energy (4)momentum
What are the (5) great theories?
(1)classical mechanics (2)thermodynamics (3)electromagnistm (4)theory of relativity (5)quantum mehcanics
NAME
these include classical mechanics, thermodynamics, electromangistm, theory of reativity and quanntum mechanics
the great theories of physics
What is the theory of classical mechanics?
is a theory on motion and gravitation
NAME
this is a theory on motion and gravitation
theory of classical mechanics
What is the theory of thermodynamics?
is a theory of thermal phenomena
NAME
this is a theory of thermal phenomena
themodynamics
What is the theory of electromagentism?
is a electromagentic field theory
NAME
this is a electromagenitic field theory
electromagentism
What is the theory of relativity?
is a theory of feilds in space time
NAME
this is a theory of feilds and space-time
theory of relativity
What is the theory of quantum mechanics?
is the theory of fundamental processes
NAME
this is a theory of fundamental processes
quantum mechanics
NAME
plays a role in astronomy, biology, chemistry, and the earth sciences
physics
NAME
this provides support for the other natural sciences
physics
What is kinematics?
is the mathamatical description of motion
NAME
this is the mathmatical description of motion
kinematics
What is the word dynamics used for ?
to explain why a motion occurs
x(t) can also refer to (1)
the x axis
(1) can also refer to the x axis
x(t)
What does x(t)indicate?
the postion of something moving in time
NAME
this indiactes the postion of something moving in time
x(t)
What does x refer to ?
the postion of something
NAME
this refers to the postion of something
x
What does âˆ† mean?
a change in something
NAME
this means a change in something
âˆ†
What is the name of this greek letter âˆ†?
delta
What is the differ quotient?
âˆ†x/âˆ†t
What is postion?
is a function of time
NAME
this is a function of time
postion
What is time?
it can not be explained
NAME
what is time
x means the samething as (1)
x(t)
(1) this means the samething as x(t)
x
A (1) occurs btwn 2 times
change in postion
A change in postion occurs btwn (1)
2 times
What is the time interval?
[t1,t2]
What does the greek letter tau mean?
is the greek letter for t'
NAME
this is the greek letter for t'
tau
What is the duration of a interval?
âˆ† t
NAME
this represents the âˆ† t
the duration of a intervel
what is âˆ† x?
x2-x1 or change in postion
NAME
this refers to the change in postion
âˆ† x
What does a strobe photo do?
exhbits motion as a succession of displacements
NAME
this exhibits motion as e succession of displacements
strobe photo
Draw the (2)differ types of motion and label them
see notes
Draw the most common type of motion
see notes
How do u find âˆ† x? (2)
(1)x2-x1 or (2)[x(t2)-x(t1)]
In what type of motion is the velocity a constant?
motion in striaght lin
What type of motion does not always have a consant motion? Draw picture
movement down a incline such as what galio did (see notes for pic)
(1)and (2)are called infintesimals
dt and dx
dt and dx are called (1)
infintesimals
T or F
v is the same thing as speed
false
are velocity and speed the same thing?
no
NAME
he studied a simple motion w variable velocity
galileo
What did galileo study ?
a simple motion w variable velocity
V(0) can also mean (1)
v0
(1) can also mean V0
V(0)
What is v stand for?
velocity
What is v?
is the rate of change of postion w respect to time
NAME
this is the rate of change of postion w respect to time
v
What is free fall?
refers to when u throw a ball striaght up in the air
NAME
refers to when u throw a ball striaght up in the air
free fall
Draw a pic of free fall including labels
see notes
how do u find the accelration?
a= âˆ† v/âˆ† t
how do u find the a?
a=âˆ† v/âˆ† t
going up has a (1)accelration
postive
going down has a (1)acceleration
negative
What is a?
is the rate of change of v w respect to time
NAME
this is the rate of v w respect to time
a
What does the word accelartion mean in latin?
ac-celera-tion

ac= means more
celera= latin means "celeritas" or celerity meaning faster
NAME
part of this word comes from the latin word "celeritas" or celerity meaning faster and ac for more
aceleration
How do u find energy?
E=mc62
How do u find V(t)?
V(t)=dâˆ† x/dâˆ† t or lim âˆ† x/âˆ†t
âˆ† t-0
NOTE: the derivative we already be given in the problem but it will not tell u that it is the derivative
How do u find a?
a=âˆ† v/âˆ† t
what is the speed of light?
c= 3 *10^8
Draw a graph showing the differ parts from t1 to t2.

Be sure to label
see notes
How do u find âˆ† tau?
âˆ†t/n
How do u find âˆ† v?
<a>âˆ† t
what do the symbols <> mean?
the sum of what is it in
Most cars have a (1)acceleration
smooth or constant
you have a (1)accelration when u brake
negative
When driving your care, you have a negative accelration when you (1)
brake
What does each symbol mean for the following formula?

V=Vo +<a>t
V=veliocity
Vo=inital veliocity
<a>=average acceleration
t=time
How do u find velocity?
V= vo +
What does x stand for?
a postion in time
How do u find x?
x=xo+<v>t
What do the following symbols mean?

x=xo+<v>t
x= postion in time
x0= inital x
<v>=average veliocity
t=time
What are (2)MAIN forumlas u can use only when the acceleration is constant?
(1)v=v0+at
(2)x=xo+1/2(vo+v)t
What dedication can you make about the <v> if there are the same amount of numbers, meaning the accerlation is constant? (2)
that <v> can equal the number in the middle or the midpoint
<v>= vo+v/2

(2)
Therefore x=vo + at1+a2t2/2
or x=vo+ 1/2(vo+v)
NOTE: the same applies for anything else such as tau
When can <v>=1/2(vo+v)t or <v>=vo+a1t1+at2/2?
when the are the same number of intervals then the average number is hte middle number or a constant accerlation
When there are equal amounts of numbers being equal distance from each other , meaning hte accerlation is constant then (1)
the average is the midpoint or middle number
if u have two different times and the numbers where equal, how would u find the <v>?
a(t)1=v

<v>= vo+ (v1-v0+v2-v0)/2
v=vo+at is similar to the (1) algerbraic theory when graphing
y=b+mx
(1)is similar to the y=b+mx theory when graphing
v=vo+at
What are the (4) formulas that can used if the accerlation is constant? (including the 2 that are dervied from the main 2).
(1)v=vo+at (2)x=xo+1/2(vo+v)t
(3)x=x0+v0+t1/2at^2
(4)V^2=v^20+2a(x-xo)
How formula do you use to find the v if no time is given?
v^2=v^2+2a(x-x0)
What forumla to find the <v> can u use w any form of motion?
âˆ† x/âˆ† t
T or F
<v>=âˆ† x/âˆ† t can be used to find <v> for any type of motion
true
Can <v>=âˆ† x/âˆ† t be used to find <v> for any type of motion?
yes
How would u graph the accerlation?
see notes
How would u graph the accerlation w x?
see notes
When working do not forget to put the (1)
untis and work out the math for the units by mulptying them out as well
If a is zero then (1)
the v is constant
if a is (1) then the v is constnat
0
1/2At^2-Vw+d=0 is similar to the (1)algerbaric expression and can be solved using the (2)formula
What is the critcal case?
refers to when something min amount a object can reach a certain point in time
What is the discrimint?
NAME
this always has a physical signficance
discrimint
The (1)can be used to find the critical case
discrimint
the discrimint can be used to find the (1)
critical case
How do u find the critical case?
critcal v= v = B^2-4AC
If u throw something up in the air, would a be postive or negative? Why?
negative bc u are going against gravity
If a ball is falling from a building, would its a be postive or negative? Why?
postive bc gravity is centered toward the middle of the earth
What is g on earth?
9.8 m/s^2
When throwing a ball vertically or striaght up into the air, when the max height is reached, what is the v?
0
When throwing a ball striaght up into the air or vertically, what when will the v equal zero?
when the ball reaches its max height
What is the slope of a graph?
Î” t/ Î” v
What did Galieo say about free falling objects?
he said any object at free fall w out air resistance near earth's gravity has a constant accerlation
Any object at free fall w out air resistance near earth's gravity has a (1)
constant accerlation
Why do two objects such as a peice of paper (not crumbled up) and a rock dropped do not land on the ground at the same time?
bc of air resistance
What does y1 stand for?
the max hieght of a free falling object
NAME
this represnts the max height of a free falling object
y1
T or F
A car can only have a constant a
false
What is scalar quanity?
is ordinary number
NAME
this refers to a ordinary number
scalar quanity
What is a vector?
is a directed quanty of numbers
NAME
this is a directed quanity of numbers
vector
What is the main differ btwn a vector and scalar?
a vector has a directional space where as a scalar does not
NAME
the main differ btwn a scalar and this is that it has a directional space and a scalar does not
vector
What are some examples of scalars? (2)
(1)mass (unassigned numbers) (2)charges (signed numbers
NAME
examples of these include mass (unassigned numbers) and charges (signed numbers)
scalars
T or F
scalars do not always have to have signs
true
Do scalars always have to have signs?
no
Does mass have signed or unsigned numbers?
unsigned
Does charges have signed or unsigned numbers?
signed
What are some examples of vectors? (2)
(1)displacement (2)force
NAME
some examples of these are displacement and force
vectors
What is displacement?
refers to a change in postion
NAME
this refers to a change in postion
displacement
NAME
this is simplest vector
displacement
Displacement is the (1)vecotor
simplest
What is force?
refers to a push or pull
NAME
this refers to a push or pull
force
What notation represents a vector?
â†’
A or â†’
What does the symbol mean?

â†’
A
that A is a vector
â†’
A can indicate the (1)
mangintude
(1) can indicate the mangintude
â†’
A or vector
What does the following symbol stand for?

â†’
a
acceleration vector
What does the following symbol stand for?
â†’
v
instantious velocity vector
The (1) of a vector is the scalar
mangintude
The magintidue of the vector is the (1)
scalar
Vector lie in (1) and (2) diminesions
1D and 2D
What is a right triangle?
a triangle w a 90 degree
When you have a right traingle, u can use what formula?
a^2+b^2=c^2
What is a line segment triangle? (2)
refers to when 2 vectors are going in the same direction (2)therefore, the â†’ â†’ â†’
C = A + B
NAME TRiANGLE
Because this traingle has 2 vectors that are facing the same directions, â†’ â†’ â†’
C = A + B
a line segment traingle
Can u add two differ types of vectors?
no
T or F
u can add two different types of vectors
false
How do u find the v of a free falling object?
v=v0+|g|t
How do u find y for a free falling object?
y= v0 + t- 1/2gt^2
T or F
u can have a negative gravity
false
Can u have a negative gravity?
no
If you are not giving the time of a free falling object, how do u find the v?
v^2=v^2-2gy
Use Graph A,
â†’ â†’
(1)what is the A + B?
Use Graph C,
â†’ â†’
(1)What is the sum of A + B?
see answer key for graph C
Vectors obey the (1)law
the parrelogram
â†’
What does S stand for?
the sum of two vectors
T or F
the order of the sum of the vectors matters
false
Does the sum of the vectors depend on the order they are in?
no
Vectors that are (1)from each other equal
adjacent or across from each other
Vectors that are ajacent from each are (1)
equal
T or F
adjacent or vectors across from each other have equal displacements
true
â†’ â†’
A - B = (1)
â†’ â†’
A+(-B)
â†’
What does D stand for?
the difference btwn two vectors
T or F
can have a negative value for a vector
false bc vectors are unsigned numbers
Can you have a negative value for a vector?
no
Why can you not have a negative number for a vector?
bc vectors are unsigned numbers
â†’ â†’
A+(-B) = (1)
â†’ â†’
A - B

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