Physics Equations

Question 1

Average acceleration

Answer 1

(∆V)/(∆t)

Question 2

Vf, Vo, a, t

Answer 2

Vf=vo+at

Question 3

X, Vo, a, t

Answer 3

X = Xo+Vo t+(1/2)at^2

Question 4

Vf, Vo, a, X

Answer 4

Vf^2=Vo^2+2aX

Question 5

Vavg, Vo, Vf

Answer 5

Vavg=(Vf+Vo)/2

Question 6

2nd Law

Answer 6

F=ma

Question 7

Force due to gravity

Answer 7

F=G (m1m2)/r^2

Where r is dist between center of gravities

Question 8

Incline Plane: force down plane

Answer 8

F = mgsinØ

Question 9

Incline Plane: normal force

Answer 9

F = mgcosØ

Question 10

Centripetal Acceleration

Answer 10

a=v^2/r

Question 11

Centripetal Force

Answer 11

F=mv^2/r

Question 12

Hooke’s Law: Force

Answer 12

F = -kx = ma

Question 13

Hooke’s Law: Elastic PE

Answer 13

U = PE = (1/2)kx^2

Question 14

Period (spring)

Answer 14

T = 2pisqrt(m/k)

Question 15

Period (pendulum)

Answer 15

T = 2pisqrt(L/g) where L is length of pendulum

Question 16

Torque

Answer 16

t = Fl = FrsinØ

Question 17

Kinetic Energy

Answer 17

KE = (1/2)mv^2

Question 18

Elastic Potential Energy

Answer 18

U = PE = (1/2)kx^2

Question 19

Gravitational Potential Energy

Answer 19

U= PE = mgh

Question 20

Work: By force (no friction)

Answer 20

W = FdcosØ

Question 21

Work: energies

Answer 21

W = KE + PE + E (internal)

Question 22

Work: energy + heat

Answer 22

W = ∆E - q where q is heat and E is total energy of system

Question 23

Conservation of energy

Answer 23

KE1 + PE1 = KE2 + PE2

Question 24

Power (work and energy)

Answer 24

P = ∆E/t = W/t

Question 25

Instantaneous power by force

Answer 25

P = FvcosØ where Ø is angle between Force and v

Question 26

Momentum

Answer 26

p = mv

Question 27

Impulse

Answer 27

I = ∆p = ∆mv = Favg∆t

Question 28

Rest mass energy

Answer 28

E = mc^2 where m=mass created/destroyed, c=speed of light(3*10^8m/s)

Question 29

Density

Answer 29

p = m/V

Question 30

Specific gravity (equation)

Answer 30

SG = p(substance)/p(water) where p = density

Question 31

Specific gravity (water)

Answer 31

1 g/cm^3 = 1000 kg/m^3

Question 32

Pressure (general equation)

Answer 32

P = F/A

Question 33

Pressure (at rest in a sealed container)

Answer 33

P = pgy where y=depth of fluid from top

Question 34

Pressure (at rest in open container)

Answer 34

P = Patm + pgy where Patm = 101kPa (if in meters and kg), p=density, y=dist from top of fluid

Question 35

Pressure (absolute)

Answer 35

Pabs = Patm + Pgauge

Question 36

Hydrolic lift equations

Answer 36

F1/A1 = F2/A2 F1d1=F2d2

Question 37

Buoyant Force

Answer 37

``` F = p(fluid)Vg where V=volume fluid displaced F = p(fluid)g∆hA = ∆PA, where P=pressure and A=area ```

Question 38

Flow rate (continuity eqn-pipe)

Answer 38

Q = Av where Q=flow rate, A=area of pipe, and v=velocity

Question 39

Mass flow rate (pipe)

Answer 39

I = pQ = pAv where p=density, Q=rate, A=area of pipe, v=velocity

Question 40

Bernoulli's eqn

Answer 40

K = P + pgh + (1/2)pv^2 where P=pressure(atm), h=height of fluid at given point, p=density

Question 41

Spigot velocity (fluids)

Answer 41

Vf = sqrt(2gh)

Question 42

Stress

Answer 42

Stress = F/A

Question 43

Strain

Answer 43

Strain = ∆Dimension/∆Original Dimension = ∆L/Lo

Question 44

Modulus of elasticity

Answer 44

Modulus = Stress/Strain

Question 45

Young's Modulus

Answer 45

E = (F/A)/(∆L/Lo) [Force directed perpendicular to plane it is acting on)

Question 46

Shear modulus

Answer 46

G = (F/A)/(∆x/ho) [Force directed parallel to plane its acting on)

Question 47

Bulk modulus

Answer 47

B = ∆P/(∆V/Vo) where p=pressure, V=volume