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DHL Physics > Formulas > Flashcards

Formulas Flashcards

1
Q

Density

A

Mass/Volume

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2
Q

Moment (Nm)

A

Force (N) x Perpendicular Distance (m)

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3
Q

Torque (Nm)

A

Radius (m) x Force (N) x sin(angle)

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4
Q

Stress (Pa or N/m^2)

A

Force (N)
————
Area (m^2)

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5
Q

Strain (No unit)

A

Deformation (m)
—————————
Original length (m)

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6
Q

Young’s Modulus
Elasticity (no unit)

A

Stress (Pa or N/m^2)
——————————
Strain (No Unit)

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7
Q

Bulk’s Modulus

A

Pressure/Volumetric Strain

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8
Q

Pressure (N/m^2 or Pa or psi)

A

Force (N)
—————
Area (m^2)

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9
Q

Poisson’s Ratio

A

Transverse Strain/Axial Strain

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10
Q

Centripetal Acceleration (m/s^2)

A

Velocity (m/s)^2
————————
Radius (m)

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11
Q

Centripetal Force (N)

A

Mass (kg) x velocity (m/s)^2
—————————————
Radius

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12
Q

Velocity Ratio

A

Distance moved by effort/Distance moved by load

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13
Q

Mechanical Advantage

A

Resistance/Effort

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14
Q

Work (J)

A

Force (N) x Distance moved (m)

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15
Q

Efficiency

A

Work output/Work input

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16
Q

Percentage Efficiency

A

Work output/Work input x 100%

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17
Q

Weight

A

Mass x Gravity

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18
Q

Power

A

Energy used/time taken
OR
Work done/time taken

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19
Q

Distance

A

Force x Velocity

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20
Q

Force

A

Mass (kg) x Acceleration (m/s^2)

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21
Q

Potential Energy

A

Mass x Gravity x Height

22
Q

Kinetic energy

A

1/2 x Mass x Velocity^2

23
Q

Momentum

A

Mass x Velocity

24
Q

Celsius

A

5/9 x (Fahrenheit-32)

25
Fahrenheit
9/5 x Celsius + 32
26
Torque applied by couple (Nm)
One of the Forces (N) x Radius/distance from centre of rotation (m) x 2
27
Centre of Gravity distance (m)
Total Moment (Nm) —————————- Total Weight (N)
28
Hooke’s Law Force (N)
Spring Constant (N/m) x Extension (m)
29
Absolute Pressure (N/m^2 or Pa or Psi)
Gauge Pressure (N/m^2 or Pa or Psi) + Atmospheric Pressure (N/m^2 or Pa or Psi)
30
Flotation Ratio (No Unit)
Density of the body (Kg/m^3) —————————————— Density of the Fluid (Kg/m^3)
31
Displacement where acceleration is constant (m) Equation 1
(Initial Velocity(m/s) + Final Velocity(m/s)) x time (s) ———————————————————————— 2
32
Displacement where acceleration is constant (m) Equation 2
Final Velocity (m/s) x time (s)
33
Displacement where acceleration is constant (m) Equation 3
Initial Velocity (m/s) x time (s) + 0.5 x acceleration (m/s^2) x time (s)^2
34
Height where acceleration is constant (m)
Initial Velocity (m/s) x time (s) + 0.5 x grav acceleration (m/s^2) x time (s)^2
35
Final Velocity where acceleration is constant (m/s)
Initial Velocity (m/s) + acceleration (m/s^2) x time (s)
36
Acceleration where acceleration is constant (m/s^2) Equation 1
Final Velocity (m/s)^2 - Initial Velocity (m/s)^2 —————————————————————- 2 x displacement (m)
37
Acceleration where acceleration is constant (m/s^2) Equation 2
Change in final Velocity (m/s^2) ——————————————— Time (s)
38
Periodic time of Pendular movement (s)
Length of Pendulum (m) 2 x PI x SQUARE ROOT OF ————————————— grav acceleration (m/s^2)
39
Constant volume process Heat energy added (J)
Change in internal energy (J)
40
Constant Pressure Process Work (J)
Pressure (Pa) x change in volume (m^3)
41
Speed of Light (m/s)
Wavelength of light (m) x Frequency of light (Hz/cycle per second)
42
Speed of light in vacuum (m/s) (Value)
3 x 10^8 m/s or 300,000,000m/s
43
Refractive Index (No unit)
Speed of light in vacuum (3x10^8 m/s) —————————————————— Speed of light in material (m/s)
44
Periodic Time of sine wave (s)
1 ————————————————— Frequency (Hz or cycles per second)
45
Frequency of sine wave (Hz or cycles per second)
1 ———————— Periodic time (s)
46
Wavelength of sine wave (m)
Wave speed (m/s) ————————————————— Frequency (Hz or cycles per second)
47
Approx speed of sound in Air (m/s)
20 x SQUARE ROOT OF Temperature (K)
48
Mach Number (No unit)
Speed of object (m/s) ——————————— Speed of sound (m/s)
49
Work done by expanding gas (J)
Pressure (Pa) x change in Volume (m^3)
50
Electrons in Nth shell
2 x N^2

DHL Physics (3 decks)

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