Equations

Created by

Annabelle Wallace

Cards (19)

What is the equation for kinetic energy? 
Kinetic energy = 0.5 × mass × speed2
Ek = 0.5mv2
What is the equation for GPE?
GPE = mass × gravitational field strength × height
Ep = mgh
What is the equation for power?
Power = work done ÷ time taken
Or
Power = energy transferred ÷ time taken
What are the 2 equations for efficiency?
Efficiency = useful energy output ÷ total energy input
Or
Efficiency = useful power output ÷ total power input
What is the equation for elastic potential energy?
Elastic potential energy = 0.5 × spring constant × (extension)2
Ee = 0.5ke2
What is the equation for change in thermal energy?
Change in thermal energy = mass × specific heat capacity × temperature change
What is the equation for charge flow?
Charge flow = current × time
Q = It
What is the equation for potential difference? 
Potential difference = current × resistance
V = I R
What is the equation for total resistance?
Total resistance = resistance of component 1 + resistance of component 2
Rr = R1 + R2
What is the equation for power in electricity?
Power = current × potential difference
P = I V
What are the 2 equations for energy transferred?
Energy transferred = power × time
And
Energy transferred = charge flow × potential difference
What is the equation for density?
Density = mass ÷ volume
p = m÷v
What is the equation for thermal energy for a change in state?
Thermal energy for a change in state = mass × specific latent heat
E × mL
What size the equation for wave speed?
Wave speed = frequency × wavelength
What is the equation for time period (in waves)?
Time period = 1 ÷ frequency
What is the equation for weight?
Weight = mass × gravitational field strength
W = mg
What is the equation for work done?
Work done = force × distance
W = fs
What is the equation for pressure?
Pressure = force normal to a surface ÷ area of that surface
P = f ÷ a
What is the equation of distance travelled?
Distance travelled = speed × time