IB SL Physics Unit 2.3: Mechanics - Work, energy, and power
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19 Terms
energy
the ability to do work or cause change
work
force * displacement, measured in Joules
Joules
N*m = kgm²/s²
Kinetic
energy of motion (.5mu²)
potential
energy due to position or composition (chemical, gravitational, elastic, electric, nuclear, magnetic)
both
internal or mechanical energy
power
energy/time = J/s = Watt (W)
Hooke’s Law
F=-kx
Energy final
energy initial is always equal to
efficiency
useful energy/total energy = useful power/total power = 34% KE
combustion engine
CPE; KEf +TEf + sound
dam energy conversions
GPEw →KEw→KEt→EE (electrical energy)
momentum
mass in motion
m*v
p (momentum) =
impulse
an object’s change in momentum
Ft
J (impulse) =
conserved
momentum is __________ in every collision
inelastic collision
KE is not conserved (real life collisions)
elastic collision
KE is conserved
