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Define Momentum
mass x velocity or p=mv
define impulse
force x change in time or impulse = F∆t= ∆(mv)
define resultant force
F= ∆p÷ ∆t, where ∆p is the change in momentum.
Name the 8 forms of energy
kinetic, thermal, chemical, electrostatic, nuclear, gravitational potential, elastic, magnetic
Principal of energy conservation
Energy cannot be created or destroyed, only transformed from one form to another.
kinetic energy
KE = 1/2 mv², where m is mass and v is velocity.
change in gravitational potential
∆GPE=mxgx∆h
mechanical or electrical work done is equal to …
the energy transferred
mechanical working
W=F x D = ∆E
% efficiency energy
(useful energy output)÷(total energy output) x 100
% efficiency power
(useful power output)÷(total power output) x 100
define power
p=W÷t or p=∆E÷t
