Important Equations Physics

Question 1

average velocity

Answer 1

v = ∆x/∆t

Question 2

acceleration

Answer 2

a = ∆v/∆t

Question 3

linear motion (constant acceleration) - velocity & time

Answer 3

v = v₀ + (a)(t)

Question 4

linear motion (constant acceleration) - displacement

Answer 4

∆x = v₀t + (1/2)(a)(t²)

Question 5

linear motion (constant acceleration) - velocity & displacement

Answer 5

v² = v₀² + 2a∆x

Question 6

friction model equation

Answer 6

f = (µ)(normal force)

Question 7

Gravitational Force

Answer 7

F = G(m₁m₂)/r²

G is the gravitational constant (6.67E-11 m3 s-2 kg-1)

Question 8

Newton’s second law equation

Answer 8

F = ma

Question 9

Weight - Newton’s Laws

Answer 9

F = mg

Question 10

uniform circular motion - centripetal acceleration

Answer 10

a = V²/r

Question 11

uniform circular motion - centripetal force

Answer 11

F = (mV²)/r

Question 12

Work equation

Answer 12

W = (F)(cosθ)(∆x)

Question 13

Power equation

Answer 13

P = E/∆t . =F*v . (units =kg⋅m^2⋅s^−3)

Question 14

Kinetic Energy equation

Answer 14

K = (1/2)mv²

Question 15

Potential Energy equation

Answer 15

U = mgh

Question 16

Total mechanical energy equation

Answer 16

E = U + K

Question 17

Work-Kinetic Energy Theorem

Answer 17

W = ∆K

Question 18

Linear expansion - thermodynamics

Answer 18

∆L = αL∆T

Question 19

volume expansion - thermodynamics

Answer 19

∆V = βV∆T

Question 20

Specific Heat - thermodynamics

Answer 20

Q = mc∆T

Question 21

First law of thermodynamics

Answer 21

∆E = Q + W

Change in internal energy of a system is the sum of heat of the system + the work done on the system

Question 22

Density

Answer 22

density = mass/volume
(kg/m^3)

Divide by 10^3 for g/cm^3

Question 23

Specific Gravity or Relative Density

Answer 23

density of substance/density of water (UNITS)

Question 24

Weight - fluid dynamics

Answer 24

Weight = (density)(g)(volume)

Question 25

pressure - fluid dynamics

Answer 25

P=F(perpendicular)/A
A=area
units= Pa(pascal)(N/m^2)

Question 26

continuity equation

Answer 26

A₁v₁ = A₂v₂

v=velocity

Question 27

Bernoulli’s equation

Answer 27

K(constant)=P(inner walls)+ (1/2)(density)(v²) + (density)(g)(h)
v=velocity

Question 28

Archimedes’ Principle

Answer 28

B(buoyant force) = (fluid density) x (g) x (volume displaced)

Question 29

Pascal’s Principle

Answer 29

P1 - P2=ρ(Y2-Y1)g

Question 30

Poiseuille’s Principle

Answer 30

Q=((πr^4)/(8ηL))(P1-P2)

Q=volume flow rate through a pipe

Question 31

Volume flow rate

and if you don’t have time

Answer 31

Q=V/t=v(velocity)*A
A=area

If you don’t have t Q=(v/2)πr^2