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31 Cards in this Set
- Front
- Back
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Formula for density. D
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mass/volume. M/V
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Formula for average speed.
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distance traveled/time taken
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Formula for speed.
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distance/time
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Formula for calculating speed.
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gradient of distance against time graph.
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Formula for distance.
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area under speed against time graph.
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Formula for acceleration.
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change in speed/ time taken.
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Formula for acceleration speed against time graphs
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Gradient of speed against time graph.
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Formula for force.
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Mass x acceleration
f=ma |
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Formula for moment of force.
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Force x perpendicular distance from pivot to force.
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Formula for for Hooks law
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Force= stiffness of the spring x the extension of th e spring.
f=kx |
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Formula for pressure
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Force / area
p=f/a |
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Formula for pressure at a depth.
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Depth x density x acceleration due to gravity
p=hpg |
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Formula for efficiency.
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Useful energy output / energy input x 100%
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Formula for gravitational potential energy.
g.p.e |
weight x height
g.p.e = mg x h |
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Formula for kinetic energy.
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1/2 x mass x speed x speed
k.e. = 1/2 mv squared |
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Formula for work done.
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Energy transferred
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Formula for work done calculated.
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Force x distance moved by the force
triangle x w = f x d |
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Formula for power.
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work done / time taken
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Formula for frequency.
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frequency = 1Hz over number of seconds for one vibration
1Hz/ time . so number of hertz divided by time |
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Equation for Angle of incidence
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Angle of incidence = angle of reflection ( i=r )
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Speed of light equals.
( c ) |
speed of light = 299 792 458 m/s.
C = 300 000 000 m/s or 3 x10 to the power of eight m/s |
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Formula for refractive index ( N )
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speed of light in a vacuum
------------------------------------ speed of light in the material |
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Formula for Snell's law
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refraction index = angle of incidence
------------------------ angle of refraction n = sin i/ / sin r |
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formula for frequency (Hz)
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frequency (Hz) = 1 F = 1
---------------------- ----------- period ( s) T |
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formulae for period ( s )
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period ( s ) = 1 T = 1
---------------------- --------- frequency ( Hz ) F |
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formulae for wavelength speed
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speed ( m/s ) = frequency ( Hz ) x wavelength ( m )
v = F x wavelength (symbol upside down y) |
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formulae for current ( A )
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current ( A ) = charge ( C )
--------------- time ( s ) |
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formula for charge ( C )
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charge ( C ) = current ( A ) x time ( s )
Q ( symbol for quantity ) = I x t ( current x time ) |
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formula for resistance ( ohms symbol )
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resistance ( ohms symbol ) = potential difference (v)
R = V ------------------------------ ----- current ( A ) I |
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formula for power ( W )
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Power (w) = current (A) x p.d. (v)
P = I x V |
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formula for energy transformed ( J ) = c
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energy transformed ( J ) = current (A) x P.d. (V) x time (s) .
(triangle symbol)x E= I x V x t |
