## Glossary of General Physics (exam 1)

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- 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 ∆ mean?
- a change in something

- NAME

this means a change in something - ∆

- What is the name of this greek letter ∆?
- delta

- What is the differ quotient?
- ∆x/∆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

this question canot be answered - 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?
- ∆ t

- NAME

this represents the ∆ t - the duration of a intervel

- what is ∆ x?
- x2-x1 or change in postion

- NAME

this refers to the change in postion - ∆ 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 ∆ 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= ∆ v/∆ t

- how do u find the a?
- a=∆ v/∆ 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)=d∆ x/d∆ t or lim ∆ x/∆t

∆ 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=∆ v/∆ 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 ∆ tau?
- ∆t/n

- How do u find ∆ v?
- <a>∆ 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?
- ∆ x/∆ t

- T or F

<v>=∆ x/∆ t can be used to find <v> for any type of motion - true

- Can <v>=∆ x/∆ 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
- (1)Ax^2+Bx+C (2)quad

- What is the critcal case?
- refers to when something min amount a object can reach a certain point in time

- What is the discrimint?
- B^2-4AC of the quad formula

- 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?
- Δ t/ Δ 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?
- →

A or →

- What does the symbol mean?

→

A - that A is a vector

- →

A can indicate the (1) - mangintude

- (1) can indicate the mangintude
- →

A or vector

- What does the following symbol stand for?

→

a - acceleration vector

- What does the following symbol stand for?

→

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 → → →

C = A + B

- NAME TRiANGLE

Because this traingle has 2 vectors that are facing the same directions, → → →

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,

→ →

(1)what is the A + B? - See answer key

- Use Graph C,

→ →

(1)What is the sum of A + B? - see answer key for graph C

- Vectors obey the (1)law
- the parrelogram

- →

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

- → →

A - B = (1) - → →

A+(-B)

- →

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

- → →

A+(-B) = (1) - → →

A - B