Formulas Flashcards
Speed
Speed = distance / time
Velocity
Velocity = displacement / time
Acceleration
Acceleration = change in velocity / time
Gradient
Gradient = acceleration
Distance (velocity time graph)
Distance = area under graph
Total force
Total force = mass x acceleration
v2
v2 = u2 + 2as
Weight
Mass x g
Momentum
Momentum = mass x velocity
Work
Work = energy transferred = force x distance
GPE
GPE = mass x g x height
KE
KE = 0.5 x mass x speed^2
Efficiency
Efficiency = useful energy out / total energy input
Wave speed
Wave speed = frequency x wavelength
Wave speed = distance / time
For a lens, power = ?
Power = 1/focal length
Frequency (Hz)
Frequency (Hz) = velocity (m/s) / wavelength (m)
Force
Force = change in momentum / time
Momentum before
Momentum before = momentum after
Stopping distance
Stopping distance = thinking distance + braking distance
Speed of sound through air
330m/s
Speed of sound through water at 0C
1400m/s
Speed of sound through concrete
5000m/s
Frequency
Frequency = 1/time period