Equations Flashcards
equation linking: weight, mass and gravitational field strength
weight = mass × gravitational field strength (g)
W = mg
equation linking: force, work done and distance
work done = force × distance (along the line of action of the force)
W = F s
equation linking: extension, force applied to a spring and spring constant
force applied to a spring = spring constant × extension
F = k e
equation linking: mass, speed/velocity and kinetic energy
kinetic energy = 0.5 × mass × (speed)²
Ek = ¹/₂ mv²
equation linking: height, mass, gravitational field strength and gravitational potential energy
gravitational potential energy = mass × gravitational field strength (g) × height
Ep = mgh
equation linking: power, energy transferred, time
power = energy transferred/time
P = E/t
equation linking: work done, time and power
power = work done/time
P = W/t
How do you calculate effeciency?
efficiency = useful output energy transfer/total input energy transfer
or
efficiency = useful power output/total power input
equation linking: power, time and energy transferred
energy transferred = power × time
E = Pt
equation linking: density, volume and mass
density = mass/volume
P = mV
equation linking: spring constant, extension and elastic potential energy
elastic potential energy = 0.5 × spring constant × (extension)²
Ee = ¹/₂ ke²
provided with this equation in the exam
equation linking: temperature change, mass, specific heat capacity and change in thermal energy
change in thermal energy = mass × specific heat capacity × temperature change
ΔE = mcΔθ
provided with this equation in the exam
equation linking: specific latent heat, mass and thermal energy for a change of state
thermal energy for a change of state = mass × specific latent heat
E = m L
provided with this equation in the exam
