Recall and Apply Equations Flashcards
(23 cards)
Weight mass and gravitational field strength
Weight = mass x gravitational field strength
W = mg
work done
work done = force x distance (along the line of action of the force)
W = F s
force applied to a spring
force applied to a spring = spring constant x extension
F = k e
moment of a force
moment of a force = force x distance (normal to direction of force)
M = F d
Pressure on a surface
pressure = force normal to a surface / area of that surface
p = F / A
distance
distance travelled = speed x time
s = v t
acceleration
acceleration = change in velocity / time taken
a = v / t
resultant force mass acceleration
resultant force = mass x acceleration
F = m a
momentum
momentum = mass x velocity
p = m v
kinetic energy
kinetic energy = 0.5 x mass x (speed)^2
gravitational potential energy
gravitational potential energy = mass x gravitational field strength x height
Ep = m g h
Power (energy transferred)
power = energy transferred / time
power (work done)
power = work done / time
efficiency (energy transfer)
efficiency = useful output energy transfer / total input energy transfer
efficiency (power)
efficiency = useful power output / total power input
wave speed
wave speed = frequency x wavelength
charge flow
charge flow = current x time
Q = I t
potential difference, current, resistance
potential difference = current x resistance
V = I R
power, pd, current
power = potential difference x current
P = V I
power, current, resistance
power = (current)^2 x resistance
P = I2 R
energy transferred, power, time
energy transferred = power x time
E = P t
energy transferred, charge flow, pd
energy transferred = charge flow x potential difference
E = Q V
density
density = mass / volume
p = m/v
