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MCAT > physics > Flashcards

physics Flashcards

1
Q

prefixes??? start with 10^-12 to 10^9

A 
pico -12
nano -9 
micro -6
milli -3
centi -2
kilo +3
mega +6
giga 10+9
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2
Q

mks system

A

same as the SI system

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3
Q

the big 5 equations for uniformal acceleration?

A 
d =  1/2  (Vi + Vf) t  (no a)
Vf =  Vi + at    (no d)
d = Vi (t) + 1/2 (a) (t)^2
d = Vf (t) - 1/2 (a) t^2
Vf^2 = Vi^2 + 2ad
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4
Q

The slope of a position - time graph gives _________

A

velocity

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5
Q

The slope of velocity - time graph gives the ________

A

acceleration

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6
Q

the area under velocity - time graph gives the _________

A

displacement

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7
Q

what is the value (Decimal) of
sin0/30/45/60/90
cos0/30/45/60/90

A 
sin= 0 / 0.5 / 0.7 / 0.9 / 1
cos = 1 / 0.9 / 0.7 / 0.5 / 0
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8
Q

Newton’s first law?
2nd law?
3rd law?

A

object moving = stays moving. object at rest = stays at rest unless there is Fnet acting on it.
2nd = Fnet = ma
3rd = Faction = Freaction

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9
Q

equation for Newton’s law of gravitation

Equation for g?

A 
Fg = G(Mm/r^2)
gm = G(Mm/r^2)
g = G(M/r^2)
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10
Q

static and kinetic friction equations?

A 
Fk = uk (Fn)
Fs = us (Fn)
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11
Q

center of mass equation?

A

(m1x1 + m2x2 + m3x3…) / (m1+m2+m3…)

you will need to decide on a point that is x = 0

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12
Q

uniform in physics mean?

A

constant

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13
Q

what does uniform circular motion denotes?

A

constant speed and constant redius (also a is constant and only effect direction of velocity)

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14
Q

where does the acceleration point in a circular path?

A

toward the center of the circle

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15
Q

acceleration in a circular motion is called? equation?

A

centripetal accelerartion. directed toward the center. always perpendicular to v

ac = v^2 / r

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16
Q

Equation for centripetal acceleration?

A

ac = v^2 / r

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17
Q

magnitude of centripetal force equation?

A

Fc = (m)(ac) = mv^2 / r

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18
Q

what is the fulcrum? other name?

A

other name is pivot point. the point that the system spin or rotate around. the point that doesn’t move while the object rotates.

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19
Q

torque equation?

A

rFsin(o)

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20
Q

torque unit?

A

N.m

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21
Q

other equation for torque using lever arm?

A

t = L F (where l is the lever arm. or the shortest line that connect the pivot point with the force line to form a 90 degree angel).

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22
Q

equiliberium in physics mean

A

zero acceleration

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23
Q

static equiliberium mean? (in physics)

A

zero velocity

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24
Q

translational equilibruim?

A

F net is zero. and translational acceleration is zero

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25
Q

rotational equilibrium?

A

net torque is zero.

26
Q

if equilibrium was mentioned without mentioing the exact type then its assumed?

A

its both rotational equilibrium and translational equilibrium

27
Q

other name for rotational inertia?

A

moment of inertia

28
Q

what is the moment of inertia? equation?

A

how resistent an object is to rotational acceleration.
torque (net) = I (alpha)
I = moment of inertia and
alpha = rotational acceleration

29
Q

if the mass is closer to the center of rotation, then the moment of interia would be?

A

smaller.

30
Q

if the mass is further to the center of rotation, then the moment of interia would be?

A

bigger

31
Q

a sphere or a hollow ball, which have a larger moment of interia?

A

hallow ball

32
Q

bigger moment of inertia means? _______ rotational acceleration

A

harder to rotate = smaller rotational acceleration (t =Ia)

33
Q

which direction loosen? which direction of rotation tighten?

A

right tighty left loosey

34
Q

intensive property?

A

unrelated to the amount of the substance. like color

35
Q

extensive property

A

related to the amount of the substance, like thermal energy

36
Q

what is the equation from the 1st law of thermo?

A

dalta E = Q - W

37
Q

Dalta E = Q - W
where W is work done (by/on) the system
and Q is heat (into/out of) the system

A

heat into the system and work by the system

38
Q

isochoric process?

A

constant volume

39
Q

isobaric process? what happens?

A

constant pressure means Change in P is zero

40
Q

isothermal process? what does it mean?

A

constant temp which mean constant KE avg which means constant E in dalta E = Q -W which means Q = W

41
Q

adiabatic process?

A

no heat transfer (Q = 0)

42
Q

What is a new equation that happens in isobaric processes? derivied from 1st law of thermo

A

Dalta E = Q - P Dalta V

W = F dalta h = PA dalta h = P dalta V

43
Q

what is the new equation for an isochoric process? Dervied from the 1st law of thermo.

A

dalta E = Q (since Dalta V = 0 then W = 0 thus E = Q)

44
Q

what is the new equation for an isothermic process? how did we get this equation?

A

since temp is constant. then based on P = nRT/ V there is an inverse relationship between V and P. and any work done on/by the system will result in heat out/into the system and to keep Temp constant = KE constant = Dalta E = 0 and thus Q = W

45
Q

how does the four thermo process appear on a P-V diagram? isobar, isochore, isothermal, and adiabat.

A
46
Q

density equation?

A

p = m/V

47
Q

density S.I unit

A

kg/ m^3

48
Q

fluid weight equation

A

w = pVg

49
Q

what is specific gravity? equation?

A

the density of something relative to water. ratio.

d/ dwater

50
Q

density of water?

A

1000 kg/m^3

51
Q

equation of P gauge, and how we got it? equation for total pressure?

A 
P = F/A
= W/A
= mg/A
= pVg/A
=pAdg/A
=pdg
Ptotal = Pgauge + P surface.
52
Q

how to know how much of an object will submerge under water? equation?

A

same ration as the two densities.

pobject/pfluid = Vsubmerged / Total

53
Q

flow rate equation?

A

f=Av

54
Q

requirements for an ideal fluid flow?

A

incompressible
negligible viscosity
laminar (Streamline) flow
flow rate is steady

55
Q

as the pressure of an ideal fluid goes up, the speed of the fluid __________

A

goes down

56
Q

what is Bernoulli equation? When can it be applied? When can we eliminate P? When can we eliminate pgy?

A

with ideal fluid flow.
P + pgy1 + 1/2 pv^2 = ……

pgy is constant when its the same height.
P is constant and equal to Patm when exposed to the atmoshpere.

57
Q

Why the two vehicles get toward each other? Explain.

A

Because the path between the two cars is narrower than on the outside, based on f=Av, this cuases the air to flow faster between the cars. Based on Branulli equation, this cuases an increase in 1/2pv^2 which causes the P to drop between the cars. Then the high P on the outside cuases the two cars to push toward each other.

58
Q

electric force equation?

A

k Q q / r^2

59
Q

electric potential equation

A

kQ/r

60
Q

electric potential energy

A

E = kQ/r^2

61
Q

electric potential energy (2 equations!)

A

kQq/r
or
qV

62
Q

equation for the work done by an electric field?

A

change in electric potential energy.

MCAT (6 decks)

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