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Flashcards in Physics Deck (58):
1

Kinematic Equations

v= v0 + at
x= v0t + 1/2at^2
v^2 = v0t^2 + 2ax

2

Force Units

Newton’s (N)

3

Velocity Units

m/s

4

First Law of Motion

Inertia

Forces are balanced

5

Second Law of Motion

F=ma

acceleration must occur

6

Third Law of Motion

every action has an equal and opposite reaction

7

The Law of Gravitation

Fg = Gmm / r^2

8

Circular Motion

F = points toward the center
a = points toward the center

9

Tangenital Acceleration

a = ∆speed/∆t

10

Centripetal Acceleration

a = v^2/r

11

Torque

τ = rFsin⁡θ

12

Frequency

f = 1/T
units (1/s or Hz)

13

Torque Equilibrium

static: τnet = 0 and Fnet = 0
translational: Fnet = 0
rotational: τnet = 0

14

Bernoulli's Equation

constant = P + 1/2pv^2 + pgh

15

Archimede's Principle

Buoyant Force = pgV

16

Pascal's Principle

conservation of pressure
F1/A1 = F2/A2

17

Coulomb's Law

F=kqq/r^2

18

Ohm's Law

V=IR

19

Current

I=Q/∆t

unit: Amps

20

Potential Difference (Voltage)

∆V = W/q = kQ/r or V=Ed

unit: J/c

21

Capacitance

C=Q/V

22

Energy in Capacitors

U = 1/2QV = 1/2CV^2 = 1/2(Q^2/C)

23

Electric Potential Energy

U = q∆V = qEd = kQq/r

24

Electric Field

E=F/q = kQ/r^2

units: N/C or V/m

25

Refraction

n=c/v

26

Power

P=w/t

unit: J/s

27

Pressure

P=F/A

28

Ramp Forces

FN=mgcosø
downward force=mgsinø

Fnet=downward force-FN

29

Continuity Equation

A1V1=A2V2

30

Falling Question Equations

PE=KE

mgh=1/2mv^2

31

Energy produced from atoms

E=mc^2

32

Centripetal Force

F = mv^2/r

33

First Law of Thermodynamics

∆U = Q - W

34

Static Pressure

P = pgz

35

Absolute Pressure

P = P0 + pgz

36

Gauge Pressure

Pg = P - Patm

37

Electric Dipole

p = qd

38

Resistance

R = pL/A

units: Ohms

39

Power from Resistors

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

40

Wave formula

f= 1/T and v=fλ

41

Open Pipes and Strings

λ = 2L/n --> use this to find L
f = nv/2L

42

Closed Pipes

λ = 4L/n
f = nv/4L

43

Intensity

I = P/A

units: W/m^2

44

Sound Level

10log (I/Io)

unit: dB

45

Doppler Effect

f' = f (v ± vD)/ (v ± vS)

46

Speed of Light (c)

3 X 10^8 m/s

47

Diffraction

asinø = nλ

48

Optics Equation

1/o + 1/i = 1/f = 2/r

49

Convex Mirror

only produces virtual upright images

50

Concave

object inside focal length is behind, enlarged, and virtual

51

Converging Lenses

object beyond = real and inverted
object inside = virtual, upright, and enlarged
object at focal point = no image

52

Magnification

m = -i/o

53

Photoelectric Effect

E = hf = hc/λ
K = hf - W

54

Half Life

n = ne^-λt

55

log trick

log (n X 10^m) = m + 0.n

56

FINER Method

feasible, interesting, novel, ethical, relevant

57

Hill's criteria

only temporality is necessary

58

Error Sources

- small sample size
- defects in precision and accuracy
- bias (selection, deteciton, Hawthorne-randomization)
- confounding