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SAT Physics Formulas > Formulas for Physics > Flashcards

Formulas for Physics Flashcards

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1
Q

What are the 3 kinematics formulas?

A

x(final)=x(initial)+v(initial)t+1/2at^2
v(final)^2=v(initial)^2+2a(delta x)
v(final)=v(initial)+a*t

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2
Q

What is the equation for a phase change?

A

Q=m*l
Q= change in heat
l= specific heat of transformation

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3
Q

What is centripetal acceleration?

A

a=v^2/r

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4
Q

What is the formula for weight(W)?

A

W=mg

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5
Q

What is the formula for the force on a wire in a magnetic field?

A 
F= I*L*B*sin theta
F= force on wire
I= current on wire
L= Length of wire
B= external magnetic field
theta= angle between direction of current and magnetic field
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6
Q

What is the formula for kinetic energy?

A

KE=1/2*mv^2

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7
Q

Why is delta UE=-W

A

Because negative work causes KE to decrease which gets converted to UE. (negative work energy theorem means less final KE which)

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8
Q

What is the period of a pendulum?

A

T(pendulum)=2pisqrt(l/g)

l= length of pendulum

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9
Q

What is the definition of Pressue?

A

P=F/A

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10
Q

What is Power?

A

P=W/delta t

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11
Q

What is the formula for electric potential?

A

V=k*q/r

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12
Q

What is Hooke’s Law? Which direction does the spring force point?

A

F(spring)=k(spring constant)*x

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13
Q

What is Work Energy Theorem?

A

W=delta KE

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14
Q

What is the equation for a heat engine?

A

E%=W/Q*100
E=efficiency of the engine
W= work done by engine
Q= heat absorbed by engine

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15
Q

What is the electric field generated by two metal plates?

A

E=V/d

V= voltage of battery

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16
Q

What is Newton’s second law?

A

F=ma

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17
Q

Basic Thermo Equation (Hint MCAT)

A

Q=mc delta T

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18
Q

What is Coulomb’s Law?

A

F=k(q1q2)/r^2

k= a constant

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19
Q

What is the equation for momentum?

A

p=m*v

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20
Q

What is total mechanical energy?

A

E=KE+PE

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21
Q

Resistors in series and in parallel?

A 
Series= R1+R2+R3.......
Parallel= 1/R1+1/R2+1/R3.....
22
Q

How do you find electric potential of two charges at distance r?

A

UE=k(q1q2)/r^2

UE=potential of two charges

23
Q

What is the friction force? (Hint F.U.N equations)

A

f=u(mu)*normal force (N)

24
Q

What is angular momentum?

A

L=mvr

25
Q

What is the mirror equation?

What do a positive/negative di and f mean?

A

1/f=1/do+1/di
f= focal length
do= distance of object
di= distance of image
Positive di and f mean real focal length(concave) and real image.
Negative di and f mean virtual focal length(convex) and virtual image.

26
Q

What is the wave velocity?

A

v=(lambda)*frequency

lambda=wavelength

27
Q

What is the wave particle duality?

A

lambda=h/p
lambda= matter wavelength
h= a constant
p=momentum

28
Q

What is the formula for Work?

A

W=Fdcos theta

W= F(parallel to movement)*distance

29
Q

How are frequency and period related?

A

inversely

30
Q

How do you calculate light going through a medium?

A

v=c/n

n= index of refraction

31
Q

What is velocity for an object in circular motion?

A

v=(2pir)/T(period)

32
Q

What are the three power formulas for a circuit?

A

P=IV
P=V^2/R
P=I^2*R

33
Q

What is the magnification equation?

A

m=-(di/do)
-m=inverted image
|m|>1 means larger image

34
Q

What is the formula for an electric field?

A

E=k*q/r^2

35
Q

What is the ideal Gas Law?

A

PV=T

36
Q

What is the formula for potential energy?

A

PE=mgh

37
Q

What is the period of a spring?

A

T(spring)=2pisqrt(m/k)

38
Q

What is Newton’s Law of Gravitation?

A

F(g)=G(m1m2)/r^2

39
Q

What is impulse?

A

A change in momentum
delta p= p(final)-p(initial)
delta p= force*delta t

40
Q

What is the energy of a photon?

A

E=h*f
E= energy of a photon
h= a constant
f= wave frequency

41
Q

What is the first law of thermodynamics?

A

delta U= Q-W
U= internal energy
Q= heat added
W= work done by system

42
Q

What is torque?

A

t=r*f(perpendicular to axis of rotation)

t=rfsin theta

43
Q

What is the force on a charge as it moves through an electric field?

A

F=qvB*sin theta

theta= angle between direction of motion and magnetic field

44
Q

What is Snell’s Law? Why is it used?

A

n1 sin theta1=n2 sin theta2

It is used to calculate the new angle light travels when changing from one medium to another.

45
Q

What is the formula for a potential difference (V)?

A

delta V= -W/q
delta V= delta UE/q
W= Work done by E field
-W=delta UE

46
Q

What is the force of an electric Field?

A

F=q*E

47
Q

What is Ohm’s Law?

A

V=IR
V= voltage
I= current
R= Resistance

48
Q

Equation for Capacitance?

A

q=CV

C is number specific for capacitors like R for resistors

49
Q

What is centripetal force?

A

F=(m*v^2)/r

50
Q

What is the potential energy for a spring?

A

PE(spring)=1/2kx

x= amount of spring stretch or compression, x=0 is natural spring length

SAT Physics Formulas (1 decks)

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