Units & Equations Flashcards
What is the equation relating speed, distance and time?
Distance = speed x time or Speed = distance / time
What is the unit for speed?
m/s
What is the equation relating weight, mass and gravitational field strength?
weight = mass x gravitational field strength
What is the unit for weight?
N (it is a force)
What is the unit for mass?
kg
What is the equation relating work done, force and distance?
work done = force x distance
What is the unit for work done?
J or Nm
What is the equation relating force in a spring. spring constant and extension?
force = spring constant x extension
What is the unit for force?
Newtons
What is the equation that relates moment, force and distance?
Moment = force x distance
What is the unit for moment?
Nm
What is the equation relating pressure, force and area?
pressure = force / area
What is the unit for pressure?
N/m2 or Pa
What is the equation relating acceleration, change in velocity (speed) and time?
acceleration = change in speed / time taken
What is the unit for acceleration?
m/s2
What is the equation relating force, mass and acceleration?
force = mass x acceleration
What is the equation relating momentum, speed and mass? (Higher Tier Only)
momentum = speed x mass
What is the unit for momentum?
kgm/s
What is the equation for kinetic energy?
kinetic energy = 1/2 x mass x speed^2
What is the unit for kinetic energy?
J, Joules (all energy has units Joules)
What is the equation for gravitational potential energy?
G.P.E = mass x gravity x height
What is the unit for gravitational potential energy?
J
What is the equation relating power, energy transferred and time?
Power = energy transferred / time
What is the unit for power?
Watt, W
What is the equation relating power, work done and time?
Power = work done / time or Work done = power x time
What is the equation for efficiency?
efficiency = useful power/energy / total power/energy
What is the equation relating wave speed, frequency and wavelength?
wave speed = wavelength x frequency
What is the unit for wave speed?
m/s
What is the unit for wavelength?
m
What is the unit for frequency?
Hz
What is the equation relating charge flow, current and time?
Charge flow = current x time
What is the unit for charge flow?
Columbs, C
What is the unit for current?
Amps, A
What is the equation relating potential difference, current and resistance?
Potential difference = current x resistance
What is the unit for potential difference?
Volts, V
What is the unit for resistance?
Ohms
What is the equation relating power, potential difference and current?
Power = potential difference x current
What is the equation relating power, current and resistance?
Power = current^2 x resistance
What is the equation that relates energy transferred, power and time?
Energy transferred = power x time
What is the equation that relates energy transferred, potential difference and charge flow?
Energy transferred = potential difference x charge flow
What is the equation that relates density, mass and volume?
density = mass / volume
What is the unit for density?
g/cm3 or kg/m3
