Physics

Question 1

Linear Motion Formulas

Answer 1

Question 2

circular motion equations for a & F

Answer 2

Question 3

Work-Energy theorm

Answer 3

work performed by all forces acting on a body equal the change in E

Question 4

Thermal expansion

Linear and Volume

Answer 4

Linear expansion: the increase in length by most solids when heated

“when T increases, length increases a LOT”

Volume expansion: increase in volume of fluids when heated

Question 5

conduction vs convection

Answer 5

conduction: direct transfer of E via molecular collisions
convectoin: transfer of heat by physical motion of a fluid

Question 6

specific heat and heat of transformation

Answer 6

specific heat: Q= mcΔT (only be used to find Q when object doesn’t change phase)

heat of transformation: quantity of heat required to change phase of 1g of substance

Q=mL

(L = heat of fusion/vaporization etc)

Question 7

Bernoulli’s equation

Answer 7

P + 1/2ρv² + ρgh = constant

Question 8

Archimedes principle

Answer 8

F_buoy = ρ_fluid*g*V_submerged

Question 9

Pascal’s principle

Answer 9

a change in pressure applied to an enclosed fluid is transmitted undiminished to every portion of the fluid and to the walls of the containing vessel

Question 10

Coulomb’s Law

Answer 10

F = kq₁q₂/r²

Question 11

electrical potential energy (U) formula

Answer 11

U = q∆V = qEd = kQq/r [SI units: J]

Question 12

Voltage

Answer 12

Voltage = W/q = kQ/r

Question 13

Current

Answer 13

flow of electric charge

I=Q/t

Question 14

Ohm’s Law

Answer 14

V=IR

Question 15

Resistance

Answer 15

opposition to flow of charge

R = ρL/A (Resistance increases with increasing temperatures with most conductors.)

Question 16

Kirchhoff’s Laws

Answer 16

1. At any junction within a circuit, the sum of current flowing into that point must equal the sum of current leaving.
2. The sum of voltage sources equals the sum of voltage drops around a closed-circuit loop.

Question 17

Series vs Parallell Circuits R, V, I

Answer 17

SERIES: in series, I is the same. THINK SI units

R_eq= R₁ + R₂ + R₃

V_T= V₁ + V₂ + V₃

I_T= I₁= I₂ = I₃

PARALLEL: in parallel, V is same THING VP

1/R_eq= 1/R₁ + 1/R₂ + 1/R₃

V_T= V₁ = V₂ = V₃

I_T= I₁ + I₂ + I₃

Question 18

Power dissipated by resistors

Answer 18

P=IV=V²/R=I²R

Question 19

Capacitance

Answer 19

ability to store charge per unit voltage

C=Q/V

C=A/d

capacitors in parallel add: Ceq=C1+C2+C3

capacitors in series add as reciprocal

Question 20

Energy stored by capacitors

Answer 20

Question 21

standing waves formula for wavelength

Answer 21

λ = 2L/n (n = 1, 2, 3…)

this is the same in open pipes

IN CLOSED PIPES: λ = 4L/n (n = 1, 2, 3…)

antinode=peak

node= 0 displacement

Question 22

doppler effect

Answer 22

Question 23

refraction formula and snell’s law

Answer 23

n=c/v

Snell: : n1sin θ1 = n2 sin θ2. When n2 > n1, light bends toward the normal; when n2 < n1, light bends away from the normal.

Question 24

magnification

Answer 24

m=-i/o

when m is +: ERECT image

when m is -: INVERTED image

Question 25

Photoelectric effect

(energy and electron ejection)

Answer 25

Question 26

alpha decay

beta-minus decay

beta-plus decay

Answer 26

Question 27

Magentic force equation

Answer 27

F=q (V x B)

Question 28

first law of thermodynamics

Answer 28

Adiabatic (Q=0), so ΔU=-W

Constant V (W=0) so ΔU=Q

(((Work= Pressure *ΔVolume))

Isothermal: Q=W