Equations Flashcards
Kinetic energy
kinetic energy= 1/2 x mass x speed^2
kinetic energy=J
mass= kg
speed= m/s
gravitational energy
gravitational energy= mass x gravitational field strength x height
greaviatational energy= J
mass= kg
gravitational field strength= N/kg
height= metres
Elastic potential energy
Elastic potential energy = 1/2 x spring constant x extension^2
Elastic potential energy= J
Spring constant= N
Extension= m
Change in thermal energy
Change in thermal energy= mass x specific heat capacity x temperature change
Change in thermal energy= J
mass= kg
c= J/kg°C
Temperature change= °C
Power
power= work done/time
power= W
work done= J
time= seconds
Power (involving energy transferred)
Power = energy transferred/time
power= Watts
Energy transferred= Joules
time= seconds
Efficiency
Efficiency= useful output energy transfer/total input energy transfer
useful energy output= J or kJ
total energy input= J or kJ
efficiency involving power outputs and inputs
efficiency= useful power output/ total power input
Useful power output= W or kW
Total power input= W or kW
work done
work done = force x distance moved
work done = J
force= N
distance moved= m
Force applied
Force applied= spring constant x extension
force applied = N
spring constant = N/m
extension= m
Pressure
Pressure (Pa) = force (N)/ surface area (m^2)
acceleration
acceleration (m/s^2) = change in velocity (m/s)/ time taken (s)
momentum
momentum (N) = mass (kg) x velcocity (m/s)
Voltage
Voltage (V) = current (A) x resitance (ohms)
Time period
Time period (s)= 1/frequency (Hz)
